+publisher:"Texas A&M University" +contributor:("Sanders, James O")

Texas A&M University

1. Garrett, Kelly Nicole. Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers.

Degree: MS, Animal Breeding, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173508

► Sire selection is a large financial investment for beef cow operations. Seedstock cattle producers desire knowledge regarding which traits impact differences in value or sale… (more)

▼ Sire selection is a large financial investment for beef cow operations. Seedstock cattle producers desire knowledge regarding which traits impact differences in value or sale price among their customers. Bull sale data were collected from a purebred Beefmaster ranch in central Texas for five consecutive years (2012-2016, n = 521 records of 19 to 27 month old bulls). The buyers were classified by the sale host based on knowledge about their cow herds as (1) commercial or (2) seedstock/purebred; all bulls marketed were purebred and able to be registered by Beefmaster Breeders United. Data for these two buyer groups were analyzed separately through various hedonic models to understand important attributes affecting sale price. Each model utilized the same categorical variables, but alternate continuous variables were evaluated as: (1) animals’ performance trait values, (2) animals’ ratio values, or (3) animals’ EPD values, with a final prediction model developed for each buyer type. The final commercial buyer model had an R² value of 85%, but the final purebred buyer model had an R² value of 44%, indicating that bull price predictions in this dataset were easier to determine among commercial buyers. Commercial buyers placed more emphasis (P < 0.05) on the physical traits through conformation score on a 4-point scale (score 2 discounts of 1079.00 to 910.77 depending on the model), sire (P < 0.001) and maternal grandsire (P = 0.001) pedigree information, ribeye area ratio (-40. 64 ± 14.667 for each 1% point increase), and quadratic form of weaning weight EPD (4.86 ± 1.770). Purebred producers placed more emphasis (P < 0.05) on the birth season (age category) in which bulls were born (3349.07 to 4810.73 higher for spring born bulls depending on the model), consignor or owner of the animal (-2669.66 to -2201.45 less for other consignors compared to the host ranch depending on the model), birth weight EPD (- 2793.00 to -983.06 for each 1-lb increase), and quadratic form of yearling weight EPD (8.13 to 10.47 depending on the model). In this dataset of Beefmaster bulls, class of buyer showed substantial differences in information preferences, and different levels of predictability; this is not surprising and is likely true in most breeds from different goals and intended uses across bull buyers. Advisors/Committee Members: Herring , Andy D. (advisor), Anderson , David P. (committee member), Sanders , James O. (committee member).

Subjects/Keywords: Beefmaster bulls; hedonic pricing models; purebred sales; buyer preferences

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Garrett, K. N. (2018). Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173508

Chicago Manual of Style (16^th Edition):

Garrett, Kelly Nicole. “Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers.” 2018. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/173508.

MLA Handbook (7^th Edition):

Garrett, Kelly Nicole. “Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers.” 2018. Web. 23 Jan 2021.

Vancouver:

Garrett KN. Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/173508.

Council of Science Editors:

Garrett KN. Hedonic Pricing Models to Estimate Traits Valuable to Beefmaster Bull Buyers. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173508

Texas A&M University

2. Boenig, Lydia. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows.

Degree: MS, Animal Breeding, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10602

► Calf crop born, calf crop weaned, calf birth weight, calf weaning weight, and cow weight at weaning were evaluated from 1996 to 2009 in Brahman… (more)

▼ Calf crop born, calf crop weaned, calf birth weight, calf weaning weight, and cow weight at weaning were evaluated from 1996 to 2009 in Brahman (B) and Hereford (H) straightbred and crossbred cows (n = 1,515). The objective of these analyses was to estimate heterosis for F1 and F2 females for these reproductive and maternal traits. Breed groups included B, H, F1 Hereford-sired (HB) and Brahman-sired (BH) cows (n = 114 purebreds, 55 F1, 52 F2). Second generation breed groups included cows sired by HB and out of HB dams (F2HB) and BH dams (HBxBH); and cows sired by BH and out of HB dams (BHxHB) and BH dams (F2BH). Least squares means were calculated for calf crop born, calf crop weaned, and calf birth and weaning weights, using numerous different models, where the trait was the dependent variable. Previous research and these preliminary analyses showed that the effects of year and cow age are real as is their interaction each other and with breed type. In each attempted model designed to remove these effects, different breed groups received excessive adjustments, rendering the resultant heterosis estimates inappropriate. To more clearly assess differences, presentation and visual evaluation of unadjusted means were conducted. The model for mature cow weight (cows at 6 years of age) included breed group as fixed effects and cow within breed group and year as random effects. F2 cows appeared to retain approximately 39% of F1 heterosis for calf crop born and approximately 50% for calf crop weaned. HB x BH cows delivered the lightest calves at 33.9 (4.74) kg and F2BH had the heaviest calves at birth at 36.6 (5.37) kg. BH cows weaned the heaviest calves at 240.9 (38.1) kg and F2BH cows weaned the lightest calves at 208.4 (31.9) kg. Sire breed of calf and age of cow appear to be important factors regarding weight traits. Retained heterosis for cow weight at weaning was higher than expected at 73%. Sire breed group differences (HB vs. BH) for these traits in F2 cows may merit further investigation. Advisors/Committee Members: Riley, David G. (advisor), Sanders, James O. (advisor), Herring, Andy D. (committee member).

Subjects/Keywords: Heterosis; Brahman; Hereford; Heterosis Retention

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APA (6^th Edition):

Boenig, L. (2012). Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10602

Chicago Manual of Style (16^th Edition):

Boenig, Lydia. “Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows.” 2012. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10602.

MLA Handbook (7^th Edition):

Boenig, Lydia. “Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows.” 2012. Web. 23 Jan 2021.

Vancouver:

Boenig L. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10602.

Council of Science Editors:

Boenig L. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Brahman x Hereford Crossbred Cows. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10602

Texas A&M University

3. Woolfolk, Matthew. Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies.

Degree: MS, Animal Breeding, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153610

► The objectives of this study were to estimate heritability of performance traits in Brahman and Brahman-influenced (¼ or ½ Brahman) stocker cattle on cool-season (n… (more)

▼ The objectives of this study were to estimate heritability of performance traits in Brahman and Brahman-influenced (¼ or ½ Brahman) stocker cattle on cool-season (n = 1,732) and warm-season (n = 1,199) forages. Cattle were born from 1986 to 2011 at the Texas A&M AgriLife Research and Extension Center at Overton, TX. Traits included end of period body weight (BW), average daily gain (ADG), and body condition score (BCS). Data were analyzed for each season using animal models, with main effects including stocking rate (3 levels), breed type (3 levels), supplementation (2 levels), and contemporary groups constructed by sex and year. Age was fit as a linear covariate. Across levels of stocking rate, calves at low stocking rates had heavier BW, higher ADG, and higher BCS than calves at medium and high stocking rates. For cool-season ADG and BCS, an interaction between breed type and supplementation was included (P = 0.002). Supplemented calves had higher BCS across all breed types, while only ¼ Brahman ADG was greater for supplemented cattle. All warm-season traits differed between levels of supplementation. For warm-season, ¼ Brahman had the heaviest BW, while ½ and purebred Brahman did not differ (P = 0.39). For ADG, ½ Brahman was greater than ¼ Brahmans and purebreds, which did not differ (P = 0.10). No difference in warm-season BCS between breed types was detected. Heritability estimates for cool-season BW, ADG, and BCS were 0.72 ± 0.094, 0.14 ± 0.083, and 0.25 ± 0.099, respectively. For warm-season forages, heritability estimates for BW, ADG, and BCS were 0.44 ± 0.130, 0.15 ± 0.099, and 0.29 ± 0.106, respectively. The estimates for ADG and BCS in both seasons corresponded with estimates of similar traits in other experiments, as did the estimate for warm-season BW. The estimate for cool-season BW seemed high. Potential causes included influence of breed type on heritability estimates, as documented in other studies, as well as differences between traits in seasons, where measurements of the same trait in different environments could differ. Advisors/Committee Members: Riley, David G (advisor), Rouquette, Francis M (committee member), Sanders, James O (committee member).

Subjects/Keywords: cattle; heritability; forage; Bos indicus

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APA (6^th Edition):

Woolfolk, M. (2014). Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153610

Chicago Manual of Style (16^th Edition):

Woolfolk, Matthew. “Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies.” 2014. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/153610.

MLA Handbook (7^th Edition):

Woolfolk, Matthew. “Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies.” 2014. Web. 23 Jan 2021.

Vancouver:

Woolfolk M. Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/153610.

Council of Science Editors:

Woolfolk M. Estimation of Genetic Parameters for Post-Weaning Performance Traits in Brahman and Brahman-Influenced Stocker Cattle on Forage-Based Studies. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153610

Texas A&M University

4. Vitanza, Sarah M. Expression of Candidate Genes for Horn Growth in Early Bovine Development.

Degree: MS, Animal Science, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7604

► Bovine horns develop primarily after birth and the presence or absence of horns is due to a single gene. It has been reported that the… (more)

▼ Bovine horns develop primarily after birth and the presence or absence of horns is due to a single gene. It has been reported that the horn bud appears in the bovine embryo at d 60 of gestation. Our hypothesis is that the gene that determines the presence of horns is expressed in osteoprogenitor cells of the early fetus and will affect the expression of RUNX2, MSX1, MSX2, and/or TWIST1. To test this hypothesis, bovine fetal samples were collected from commercial females at the Caviness Packing Company in Hereford, Texas. Fetuses ranged from d 28 to d 80 of gestation. A survey of the expression of genes from the region on bovine chromosome 1 known to contain the locus that causes horns (IFNAR1 to SOD1), was conducted using qualitative and quantitative RT-PCR, and in situ hybridization. Genes with known roles in osteogenesis and chrondrogenesis (MSX1, TWIST1, RUNX2 and SOX9) were included as positive controls. With the exception of OLIG1, which was only expressed in the brain, all of the genes investigated were expressed in fetal frontal and parietal bones by qualitative RT-PCR. The level of expression of C21orf59, C21orf66, IL10RB, and SFRS15 increased in the frontal bone of horned samples from d 55 to d 70 of gestation. At d 60 of gestation, a change in the shape of the frontal bone was observed, which has been reported to be the developmental stage when the horn bud appears. At this time point, MSX1, TWIST1, RUNX2 and SOX9 were detected in frontal bone, in cells from the osteoblast lineage, as expected. Furthermore, C21orf59, C21orf62, C21or66 and SFRS15 from the polled interval were localized to developing mesenchyme, osteoblasts and/or osteoclasts of the frontal bone, suggesting that each of these genes has a role in intramembranous bone formation. In addition, gradients of expressed C21orf66 and SFRS15 were detected in developing endochondral bone. There was evidence of an antisense transcript of C21orf66 expressed in the same cell types as the sense transcript. Further characterization of this antisense transcript demonstrated that it covered the entire sense transcript. Based on observed expression in the mesenchyme, rather than just in mature osteoblasts or osteoclasts, C21orf66 and/or its antisense transcript become the most likely candidates for the polled locus. Advisors/Committee Members: Gill, Clare A. (advisor), Riggs, Penny K. (advisor), Sanders, James O. (committee member).

Subjects/Keywords: Bovine; Horns; Polled; Intramembranous bone; Fetal development

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APA (6^th Edition):

Vitanza, S. M. (2011). Expression of Candidate Genes for Horn Growth in Early Bovine Development. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7604

Chicago Manual of Style (16^th Edition):

Vitanza, Sarah M. “Expression of Candidate Genes for Horn Growth in Early Bovine Development.” 2011. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7604.

MLA Handbook (7^th Edition):

Vitanza, Sarah M. “Expression of Candidate Genes for Horn Growth in Early Bovine Development.” 2011. Web. 23 Jan 2021.

Vancouver:

Vitanza SM. Expression of Candidate Genes for Horn Growth in Early Bovine Development. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7604.

Council of Science Editors:

Vitanza SM. Expression of Candidate Genes for Horn Growth in Early Bovine Development. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7604

Texas A&M University

5. Obeidat, Mohammad Diya Talal Hamed. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows.

Degree: PhD, Animal Breeding, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151235

► Calving rate, weaning rate, birth weight, weaning weight, and ADG from 1997 to 2011 were investigated in Angus, Nellore, F_(1) Nellore-Angus, first generation 3/8 Nellore… (more)

▼ Calving rate, weaning rate, birth weight, weaning weight, and ADG from 1997 to 2011 were investigated in Angus, Nellore, F_(1) Nellore-Angus, first generation 3/8 Nellore 5/8 Angus produced as following: (1/2 Nellore 1/2 Angus sires and 3/4 Angus ¼ Nellore dams, 3/4 Angus 1/4 Nellore sires and 1/2 Angus 1/2 Nellore dams, and ¾ Nellore 1/4 Angus sires and Angus dams), and second generation 3/8 Nellore 5/8 Angus cows. The objectives were to estimate heterosis in Nellore-Angus crosses for cow reproductive traits and maternal effects on traits of their calves. The F_(1) cows expressed 0.20 ± 0.02 heterosis for calving rate, while both first and second generation 3/8 Nellore 5/8 Angus expressed 0.13 ± 0.02. the first generation 3/8 Nellore 5/8 Angus produced out of 3/4 Angus 1/4 Nellore sires and 1/2 Nellore 1/2 Angus dams expressed 0.14 ± 0.03 heterosis for calving rate. The F1 Nellore-Angus expressed 0.23 ± 0.03 heterosis for weaning rate and the 3/8 Nellore 5/8 Angus produced out of 3/4 Angus 1/4 Nellore sires × 1/2 Nellore 1/2 Angus dams and the second generation 3/8 Nellore 5/8 Angus expressed 0.14 ± 0.07 and 0.15 ± 0.05, respectively. No heterosis was expressed for birth weight in any breedtype group. Multiple attempts to analyze weaning weight and ADG and estimate heterosis resulted in excessive adjustments to least squares means. Young and oldest cows weaned lighter calves than others. F_(1) cows weaned heavier calves at most ages. Nellore-sired F_(1) calves were heavier at weaning than the reciprocal cross. Calves out of cows of intermediate ages had larger preweaning ADG than calves born to 2- and 3-yr-old and to aged cows. Generally, calves out of F_(1) Nellore-Angus cows had larger ADG than those out of cows of other breedtypes. Nellore-sired F_(1) heifers had lower ADG than Angus-sired F_(1) heifers. In general, bull calves had larger ADG than heifers. Non-F_(1) crossbred cows expressed slightly larger heterosis than what would be expected by the dominance model. Heterosis expressed by second generation 3/8 Nellore 5/8 Angus for calving and weaning rate did not appear to differ from the first generation. Advisors/Committee Members: Riley, David G. (advisor), Sanders, James O. (committee member), Herring, Andy D. (committee member), Sawyer, Jason E. (committee member).

Subjects/Keywords: Heterosis; Nellore; Angus

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APA (6^th Edition):

Obeidat, M. D. T. H. (2013). Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151235

Chicago Manual of Style (16^th Edition):

Obeidat, Mohammad Diya Talal Hamed. “Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/151235.

MLA Handbook (7^th Edition):

Obeidat, Mohammad Diya Talal Hamed. “Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows.” 2013. Web. 23 Jan 2021.

Vancouver:

Obeidat MDTH. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/151235.

Council of Science Editors:

Obeidat MDTH. Heterosis and Heterosis Retention for Reproductive and Maternal Traits in Nellore-Angus Crossbred Cows. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151235

Texas A&M University

6. Holland, Paul Wesley. Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep.

Degree: PhD, Animal Breeding, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/174032

► Ewe reproductive life traits such as longevity and stayability (the probability that a ewe will avoid removal from the flock due to reproductive performance or… (more)

▼ Ewe reproductive life traits such as longevity and stayability (the probability that a ewe will avoid removal from the flock due to reproductive performance or health) are economically important because of the relationship of removal rates with the value of the cull ewe and cost of replacements. Ewe reproductive life was evaluated as: 1) ewe longevity, 2) ewe stayability to six different ages, and 3) ewe survival. The litter size of a ewe at her birth and her litter size at rearing were investigated for potential effects on these traits. Ewe litter size at rearing was not significant in any analyses (P > 0.15), but the ewe’s litter size at birth was a significant effect in most analyses. Smaller litter sizes at birth, particularly ewes born as singles, were more often associated with greater mean longevity and stayability to specific ages (P < 0.05). Ewes born as singles had survivor functions characterized by higher probability of survival to older ages (P < 0.05). Polypay ewes had lower longevity and stayability to different ages than other breeds, as well as a survival function with lower probabilities than other breeds for survival to most older ages. Genetic parameters for these measures were consistently low for longevity (estimates of heritability ranged from 0.06 ± 0.022 in the within breed analysis of Columbia to 0.16 ± 0.024 in within breed analysis of Rambouillet). Estimates of heritability for stayability in general were somewhat higher than those for ewe longevity (ranged from 0.08 ± 0.061 for stayability to 6 yr in Columbia to 0.34 ± 0.027 for stayability to 2 yr in the across breed analyses). Lamb mortality is important to the sheep industry. Mortality was evaluated as: 1) mortality due to any reason, 2) mortality associated with birth (or at birth), and 3) mortality due to pneumonia. Estimates of heritability ranged from 0.05 ± 0.022 in the analysis of overall mortality in Polypay to 0.47 ± 0.032 in the analysis of birth mortality in Polypay. Some of these estimates of heritability suggest that selection programs could be effective for these traits. Advisors/Committee Members: Riley, David G (advisor), Sanders, James O (committee member), Gill, Clare A (committee member), Herring, Andy D (committee member).

Subjects/Keywords: ewe longevity; ewe stayability; genetic parameters; lamb mortality

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Holland, P. W. (2018). Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174032

Chicago Manual of Style (16^th Edition):

Holland, Paul Wesley. “Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep.” 2018. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/174032.

MLA Handbook (7^th Edition):

Holland, Paul Wesley. “Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep.” 2018. Web. 23 Jan 2021.

Vancouver:

Holland PW. Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/174032.

Council of Science Editors:

Holland PW. Estimation of Genetic Parameters Associated with Ewe Reproductive Life and Lamb Mortality in Northwestern United States Sheep. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174032

Texas A&M University

7. Muntean, Carl. Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity.

Degree: MS, Animal Breeding, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9455

► Birth (BWT) (n = 1,335) and weaning weight (WWT) (n = 1,246), pregnancy rate (PR) (n = 1,513), calf crop born (CCB) (n = 1,504),… (more)

▼ Birth (BWT) (n = 1,335) and weaning weight (WWT) (n = 1,246), pregnancy rate (PR) (n = 1,513), calf crop born (CCB) (n = 1,504), calf crop weaned (CCW) (n = 1,500), cow weight at palpation (CW) (n = 1,662), and cow body condition score (BCS) (n = 1,666) were evaluated from 1994 to 2010 in 143 F1 females sired by Brahman (B), Boran (Bo), and Tuli (T) bulls and out of Angus and Hereford cows. Mouth scores (MS) (n = 253) were assigned to the remaining cows from 2004 to 2009, excluding 2008. Pregnancy rate, CCB, CCW, CW, and BCS were evaluated using a model that consisted of sire of cow breed, dam of cow breed, and calf's birth year/age of cow as fixed effects. Cow within sire of cow within sire breed of cow and sire of cow within sire breed of cow were used as random effects. Birth weight and WWT were evaluated including sex of calf in the same model. Mouth scores were evaluated with two models. When broken and solid mouths were scored 1 and smooth 0, B- and Bo-sired cows (0.87 and 0.83) had higher scores (P < 0.05) than T-sired females (0.65). When solid mouths were scored 1 and smooth and broken scored 0, B-sired cows (0.40) were higher than T (0.07) (P < 0.05), and Bo (0.30) sired cows were not different from either (P > 0.05). The model for MS only included sire of cow breed and calf's birth year/age of cow as fixed effects. Two-way interactions were tested for significance. Calf's birth year/age of cow was important for all traits (P < 0.05) except the first MS model. Adjusted means (LSM) for BWT for calves out of cows by B, Bo, and T sires were 34.1, 34.0, and 34.1 kg respectively, and were not different from one another (P > 0.05). Least squares means for WWT for calves out of cows by B, Bo, and T sires were 236.7, 217.5, and 197.2 kg, respectively, and were significantly different. For both BWT and WWT, male calves were heavier (P < 0.05) than females, by 2.13 kg and 10.39 kg, on average. Least squares means for PR for females sired by B, Bo, and T bulls were 0.900, 0.930, and 0.912, and were not different (P > 0.05). Adjusted means for CCB for females sired by B, Bo, and T sires were 0.872, 0.944, and 0.892 respectively, and Bo was higher (P < 0.05) than B and T. Calf crop weaned ranked the same as CCB with adjusted means of 0.805, 0.894, and 0.843 for cows by B, Bo, and T bulls, with Bo being higher (P < 0.05) than B. Cow weight adjusted means for cows by B, Bo and T sires were 537.1, 468.9, and 462.6 kg, respectively, with B-sired females being heavier (P < 0.05) than both Bo and T sired cows. Body condition scores for B, Bo, and T sired cows were 5.19, 5.43, and 5.15, respectively, with Bo-sired cows being the highest (P < 0.05). Higher reproductive rates were found for Bo-sired cows, but B-sired cows weaned heavier calves. Advisors/Committee Members: Sanders, James O. (advisor), Gill, Clare A. (committee member), Herring, Andy D. (committee member), Riley, David G. (committee member).

Subjects/Keywords: Brahman; Boran; Tuli

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APA (6^th Edition):

Muntean, C. (2011). Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9455

Chicago Manual of Style (16^th Edition):

Muntean, Carl. “Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity.” 2011. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9455.

MLA Handbook (7^th Edition):

Muntean, Carl. “Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity.” 2011. Web. 23 Jan 2021.

Vancouver:

Muntean C. Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9455.

Council of Science Editors:

Muntean C. Evaluation of F1 Cows Sired by Brahman, Boran, and Tuli Bulls for Reproductive and Maternal Performance Traits and Cow Longevity. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9455

Texas A&M University

8. Cardin, Jessica Marie. Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers.

Degree: MS, Animal Breeding, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10123

► Steers produced in Cycle I of the Texas A & M University McGregor Genomics Project (n = 232, F2 Nellore-Angus) were evaluated for carcass composition,… (more)

▼ Steers produced in Cycle I of the Texas A & M University McGregor Genomics Project (n = 232, F2 Nellore-Angus) were evaluated for carcass composition, visceral organ weights, and model predicted residual consumption (MPRC), a measure of feed efficiency. Hot carcass weight was strongly correlated with liver weight (r = 0.70, P < 0.001) heart weight (r = 0.58, P < 0.001), and viscera weight (r = 0.55, P < 0.001) but not spleen weight (r = -0.01, P = 0.83). Liver, heart and viscera weights were moderately positively correlated with external and kidney pelvic heart fat (KPH), but not with marbling. None of the organ weights were correlated with MPRC. A subset of 54 animals was selected for extreme values of residuals of MPRC after a mixed model analysis that included fixed effects of sire and family nested within sire, and these animals were evaluated for insulin-like growth factor I (IGFI) expression in liver samples collected at harvest through quantitative real time polymerase chain reaction (qRT-PCR). IGFI relative quantity (IGFI RQ) was collected from qRT-PCR and was correlated with liver (r = -0.23, P = 0.09), spleen (r = 0.48, P <0.001) and viscera weight (r = 0.24, P = 0.08), but not any carcass trait or MPRC residual. Gene breed types were determined for 4 candidate genes of feed efficiency: insulin like growth factor-1 (IGF1), leptin (LEP), neuropeptide-Y (NPY) and ghrelin (GHRL). Gene breed types were represented as AA, AN, NA, and NN where A and N denote Angus and Nellore, respectively, and paternal inheritance is listed first. Given that contemporary group significantly influenced most traits (MPRC, all carcass traits, liver weight and viscera weight), effects of gene breed type and contemporary group were evaluated together in analyses. GHRL influenced liver (P = 0.02) and viscera weight (P = 0.02), IGF1 influenced kidney, pelvic, and heart fat (P = 0.05), NPY influenced liver weight (P = 0.03) and hot carcass weight (P = 0.04), and LEP influenced ribeye area (P = 0.05) and hot carcass weight (P = 0.04) with a tendency to influence liver weight (P = 0.06). Alternate heterozygotes for GHRL were statistically different in liver weight and viscera weight where NA was heavier than AN. Alternate heterozygotes for LEP did not differ in ribeye area, hot carcass weight, or liver weight. Alternate heterozygotes for NPY differed in liver weight (NA heavier than AN), but did not differ in hot carcass weight. Carcasses with AA for LEP and NPY were 18 to 19 kg heavier (P < 0.05) than those with NN, with heterozygotes intermediate. Advisors/Committee Members: Riggs, Penny K. (advisor), Herring, Andy D. (advisor), Sanders, James O. (committee member), Gill, Clare (committee member).

Subjects/Keywords: organ; efficiency; Angus; Nellore; carcass

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APA (6^th Edition):

Cardin, J. M. (2011). Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10123

Chicago Manual of Style (16^th Edition):

Cardin, Jessica Marie. “Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers.” 2011. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10123.

MLA Handbook (7^th Edition):

Cardin, Jessica Marie. “Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers.” 2011. Web. 23 Jan 2021.

Vancouver:

Cardin JM. Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10123.

Council of Science Editors:

Cardin JM. Evaluation of Gene Breed Type and Expression of Feed Efficiency Candidate Genes, and Their Associations with Carcass Traits in F2 Nellore-Angus Steers. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10123

Texas A&M University

9. Tolleson, Mallory Williams. Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows.

Degree: MS, Animal Breeding, 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/157088

► The objective of this study was to conduct a genome-wide association study for udder traits for crossbred cows. Average teat diameter, average teat length, and… (more)

Subjects/Keywords: GWAS; udder composition; beef cattle

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APA (6^th Edition):

Tolleson, M. W. (2016). Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157088

Chicago Manual of Style (16^th Edition):

Tolleson, Mallory Williams. “Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows.” 2016. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/157088.

MLA Handbook (7^th Edition):

Tolleson, Mallory Williams. “Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows.” 2016. Web. 23 Jan 2021.

Vancouver:

Tolleson MW. Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/157088.

Council of Science Editors:

Tolleson MW. Genome-Wide Association for Udder Composition Traits in Bos indicus – Bos taurus Cows. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157088

Texas A&M University

10. Cunningham, Samantha Fern. Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers.

Degree: PhD, Animal Science, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151946

► The overall objective of this study was to investigate various measures of cattle size. Records from three separate studies (herds) at Texas A&M University were… (more)

▼ The overall objective of this study was to investigate various measures of cattle size. Records from three separate studies (herds) at Texas A&M University were used to evaluate relationships of birth and weaning measures (n = 750) with size and productivity of females (n = 2,800 records from 450 animals) and carcass traits (n = 450) of steers. Cattle were F1 crosses sired by Angus, Brahman, Boran, Gir, Indu-Brazil, Nellore, and Tuli. Relationships between cow traits and carcass traits of steer mates were also investigated. Animals were classified into Small, Medium and Large frame size categories based on weaning age hip heights. Considerable differences in cow weight were observed within the same frame size category, and larger differences in weight within the same frame category was observed across study herds (which also differed in breed composition) than between different frame size categories within study herds in most cases; however, the large degree of confounding between frame size category and breed type prevented conclusive findings solely based on frame size category. Cow weight appeared to plateau at parity five, and in these data, this was considered to represent mature cow weight. Ranking of steer carcass weights based on frame score category followed expectations within study herds, but similar to cow weights these also varied considerably within the same frame category across study herds. Birth weight and cannon bone length accounted for 0 to 40% of the variation in parity-five weight of females and 1 to 52% of the variation in hot carcass weight of steer mates depending upon sire breed and study herd; use of weaning (weight, height, frame score) traits accounted for 2 to 46% of the variation in parity-five weight of females and 13 to 67% of the variation in hot carcass weight of steer mates, again depending upon sire breed. Different patterns were observed between females and males depending upon sire breed. Based on results seen here weaning age designation of cattle frame size may not be a precise classification of mature size, similar frame size designations can vary considerably in weight across different genetic types, and mature size classification of beef cows alone does not guarantee productivity measures, particularly when frame size is confounded with genetic background. Advisors/Committee Members: Herring, Andy D (advisor), Sanders, James O (committee member), Sawyer, Jason E (committee member), Miller, Rhonda K (committee member).

Subjects/Keywords: Mature cow weight; carcass weight; crossbred cattle; birth traits; weaning traits

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cunningham, S. F. (2013). Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151946

Chicago Manual of Style (16^th Edition):

Cunningham, Samantha Fern. “Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/151946.

MLA Handbook (7^th Edition):

Cunningham, Samantha Fern. “Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers.” 2013. Web. 23 Jan 2021.

Vancouver:

Cunningham SF. Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/151946.

Council of Science Editors:

Cunningham SF. Early Life Measures of Size as Related to Weights and Productivity in Beef Cows and Carcass Traits in Steers. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151946

Texas A&M University

11. Dillon, Jasmine Ashley. Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses.

Degree: MS, Animal Breeding, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151950

► Brahman cross calves exhibit unusual inheritance of birth weight: Brahman-sired crossbreds out of Bos taurus females are heavier with greater difference between sexes than calves… (more)

Subjects/Keywords: reciprocal differences; Brahman; birth weight; crossbred; Simmental

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APA (6^th Edition):

Dillon, J. A. (2013). Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151950

Chicago Manual of Style (16^th Edition):

Dillon, Jasmine Ashley. “Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses.” 2013. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/151950.

MLA Handbook (7^th Edition):

Dillon, Jasmine Ashley. “Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses.” 2013. Web. 23 Jan 2021.

Vancouver:

Dillon JA. Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/151950.

Council of Science Editors:

Dillon JA. Investigation of Genetic Effects on Birth Weight in Brahman-Simmental Crosses. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151950

Texas A&M University

12. Holland, Paul W. Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population.

Degree: MS, Animal Breeding, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155193

► The genetics of coat color for cattle are important to breeders and breed associations because phenotypes of these animals are used for breed recognition and… (more)

▼ The genetics of coat color for cattle are important to breeders and breed associations because phenotypes of these animals are used for breed recognition and premiums or discounts can be given due to the phenotypes. The gene for gray coat color has been determined in other species, but not in cattle. Gray in cattle is known to be recessive based upon observed inheritance. The objective of this study was to identify the regions of the bovine genome associated with gray coat color in a population of Nellore-Angus crossbred cattle. Additionally, proportions of each color and spotting were of interest. Animals (n = 1941) were classified into phenotypic color categories (i.e. red, black, gray, etc.). Proportions of each color group out of the population were determined, and the proportion of those phenotypes that have any form of spotting. Two genome-wide association analyses were conducted, one where phenotypically gray vs. not gray cattle were analyzed and another where cattle that were very light in color but had a reddish tinge were included as gray. Analyses used Bonferroni correction at α = 0.05 (α/ntests = 1.49 × 10^-6). Analysis of gray vs. not gray yielded one significant SNP marker on BTA6 at a location of 68,059,441 bp (Praw = 9.69 × 10^-7, Padjusted = 0.032) (UMD_3.1, NCBI project 32899, Gen Bank GCA_000003055.3). For the analysis of gray and reddish tinged vs. not gray, there were 5 significant markers all on BTA6 forming a region from 62.93 Mb to 83.92 Mb (UMD_3.1, NCBI project 32899, Gen Bank GCA_000003055.3).The same SNP marker from the first analysis was present in the second, but had an increased significance (Praw = 1.50 × 10^-10, Padjusted = 5.02 × 10^-6). The region on BTA6 ruled out syntaxin-17 (STX17) on BTA8 and premelanosome protein (PMEL) on BTA5, previous gray candidate genes from other species, but includes genes such as v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog (KIT), which is known to cause white coloration (spotting), and platelet-derived growth factor receptor alpha polypeptide (PDGFRA), the strongest candidate gene for the reddening in Nellore-Angus cattle, and corin serin pepsidase (CORIN), known for lighter coloration. Advisors/Committee Members: Riley, David G (advisor), Sanders, James O (committee member), Gill, Clare A (committee member), Herring, Andy D (committee member).

Subjects/Keywords: Gray; coat color; cattle; Nellore; Angus; genome-wide association; CORIN; PDGFRA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Holland, P. W. (2015). Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155193

Chicago Manual of Style (16^th Edition):

Holland, Paul W. “Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population.” 2015. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/155193.

MLA Handbook (7^th Edition):

Holland, Paul W. “Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population.” 2015. Web. 23 Jan 2021.

Vancouver:

Holland PW. Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/155193.

Council of Science Editors:

Holland PW. Identification of the Regions of the Bovine Genome Associated with Gray Coat Color in a Nellore-Angus Cross Population. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155193

Texas A&M University

13. Hulsman, Lauren Lorene. Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits.

Degree: PhD, Animal Breeding, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/150978

► The objectives of this study were to 1) evaluate marker associations for genomic regions of interest and significant ontology terms, 2) evaluate and compare 4… (more)

▼ The objectives of this study were to 1) evaluate marker associations for genomic regions of interest and significant ontology terms, 2) evaluate and compare 4 models for their efficacy in predicting genetic merit, 3) evaluate and compare the impact of using breed-of-origin genotypes in a Bayesian prediction model, and 4) evaluate the effects of data partitioning using family structure on predictions. Nellore-Angus F2, F3 and half-sibling calves were used with records for overall temperament at weaning (OTW; a subjective scoring system; n = 769) and Warner-Bratzler shear force (WBSF; a measure of tenderness; n = 389). After filtering, 34,913 markers were available for use. Bayesian methods employed were BayesB (using ̂) and BayesC (using π = 0 and ̂) in GenSel software, where, after estimation, π ̂ = 0.995 or 0.997 for WBSF or OTW, respectively. No regions associated with either trait were found using π ̂, but when π = 0 associated regions were identified (37 and 147 regions for OTW and WBSF, respectively). Comparison of genomic estimated breeding values from these 3 Bayesian models to an animal model showed that BayesC procedures (using ̂) had the highest accuracy for both traits, but that BayesB had the lowest indication of bias in either case. Using a subset of the population (n = 440), genotypes based on the breed in which the alleles originated from (i.e., breed-of-origin genotypes) were assigned to markers mapped to autosomes (n = 34,449), and incorporated into prediction analyses using BayesB (π ̂ = 0.997) with or without nucleotide-based genotypes. In either case, there was an increase in accuracy when breed-of-origin genotypes were incorporated into prediction analyses. Data partitions based on family structure resulted in 13 distinct training and validations groups. Relationship of individuals in the training with validation individuals did have an impact in some cases, but not all. There was poor prediction of genomic estimated breeding values for individuals in the validation population using BayesB methods, but performed better in all cases than breeding values generated using an animal model. Future studies incorporating breed-of-origin genotypes are of interest to determine if accuracy is improved in these groups. Advisors/Committee Members: Riley, David G (advisor), Garrick, Dorian J (committee member), Gill, Clare A (committee member), Sanders, James O (committee member).

Subjects/Keywords: genomic estimated breeding values; crossbred cattle; Bayesian Inference; overall temperament at weaning; Warner-Bratzler shear force

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hulsman, L. L. (2013). Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/150978

Chicago Manual of Style (16^th Edition):

Hulsman, Lauren Lorene. “Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/150978.

MLA Handbook (7^th Edition):

Hulsman, Lauren Lorene. “Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits.” 2013. Web. 23 Jan 2021.

Vancouver:

Hulsman LL. Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/150978.

Council of Science Editors:

Hulsman LL. Investigation of Genomic Estimated Breeding Values and Association Methodologies using Bayesian Inference in a Nellore-Angus Crossbred Population for Two Traits. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/150978

Texas A&M University

14. Bohac, Jennifer Kay. Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses.

Degree: MS, Animal Breeding, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/156275

► Calf crop born, calf crop weaned, calf birth weight, calf weaning weight, and calf preweaning average daily gain (ADG) were evaluated from 1997 to 2009… (more)

▼ Calf crop born, calf crop weaned, calf birth weight, calf weaning weight, and calf preweaning average daily gain (ADG) were evaluated from 1997 to 2009 in Brahman (B) and Angus (A) straightbred and crossbred cows (n = 194). The objective was to estimate heterosis for F1 and to compare between two groups of F2 females for these reproductive traits. Breed groups included A, B, F1 Brahman-sired (BA; a pair of letters designate the cow’s sire breed and dam breed, respectively) cows (n = 92 purebreds, 53 F1, 49 F2). F2 breed groups included cows sired by AB and out of BA dams (ABBA) and cows sired by BA and out of BA dams (BABA). Data from 2-yr-old females were analyzed separately from cows ages 3-yr-old and older. As 2-yr-olds, Brahman had the lowest calf crop born (0.36 ± 0.07; P < 0.01) and a lower calf crop weaned than every breed group except BABA (0.26 ± 0.08; P < 0.01). Also as 2-yr-olds, BABA had a lower calf crop born (P < 0.05) than BA and ABBA (0.92 ± 0.05 and 0.88 ± 0.08, respectively). As 3-yr-olds and older, BABA had heavier calves (38.74 ± 0.86; P < 0.05) than Brahman, BA, and ABBA, while Brahman had calves with the lightest (P < 0.001) birth weight. As 3-yr-olds, ABBA had the lowest (P < 0.02) calf crop born and weaned (0.28 ± 0.07 and 0.22 ± 0.08, respectively). As 5 to 10-yr-olds, BA weaned heavier calves than Angus, Brahman, and BABA (P < 0.01), and as 10-yr-old and older, ABBA weaned heavier calves than Angus, Brahman, and BABA (P < 0.02). Results suggest that low means of F2 cows sired by Brahman-sired F1 bulls may be responsible for earlier reports that heterosis for reproductive traits was totally lost in that generation. That group (BABA) was represented by a small number of cows for much of the data in later years, because of culling for reproduction, and means for that group may not be representative of the true group performance (i.e., their reproductive performance, as reported in this document, may be inflated). The low performance of BABA as 2-yr-olds and early exit of most of those cows from the project may indicate superior fertility of ABBA F2 cows. Advisors/Committee Members: Sanders, James O (advisor), Riley, David G (advisor), Herring, Andy D (committee member), Redmon, Larry A (committee member).

Subjects/Keywords: Brahman cross; hybrid vigor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bohac, J. K. (2015). Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156275

Chicago Manual of Style (16^th Edition):

Bohac, Jennifer Kay. “Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses.” 2015. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/156275.

MLA Handbook (7^th Edition):

Bohac, Jennifer Kay. “Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses.” 2015. Web. 23 Jan 2021.

Vancouver:

Bohac JK. Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/156275.

Council of Science Editors:

Bohac JK. Heterosis for Reproductive and Maternal Traits in First and Second Generation Reciprocal Brahman-Angus Crosses. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156275

15. Hulsman, Lauren L. Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population.

Degree: MS, Animal Breeding, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7830

► In cattle, base color is attributed to activity at the melanocortin-1 receptor (MC1R), historically termed the extension locus, with alleles coding for black (ED), red… (more)

▼ In cattle, base color is attributed to activity at the melanocortin-1 receptor (MC1R), historically termed the extension locus, with alleles coding for black (ED), red (e), and wild-type (E+). These alleles, in most mammals, are presumed to follow the dominance model ED > E+ > e, although exceptions are often seen. In Bos indicus x Bos taurus F2 cattle, EDE+ heterozygotes observed were discordant with the dominance series for the MC1R alleles and displayed various degrees of reddening on an otherwise predicted black background. The objective of this study was to identify loci modifying black coat color in these individuals. The hypothesis was that degree of reddening was a quantitative trait controlled by multiple genes of small effect. Reddening was classified utilizing photographs for 5 subjective scoring systems and analyzed by general linear model procedures of SAS with fixed effects of sex, sire, family nested within sire, season of photo, and spotted status. Residuals from these models were utilized for interval analyses to identify quantitative trait loci (QTL). Analyses of 19 bovine autosomal chromosomes, identified chromosome-wise suggestive (P < 0.05) and significant (P < 0.01) QTL on bovine chromosomes (BTA) 4, 5, 15, 18, 21, 27, and 29. Unexpectedly, there was evidence of a major gene (F = 67.88) affecting reddening at 71 Mb of BTA 6 (based on build Btau4.0 of the bovine genome sequence) that accounted for 61.1% of the variation in reddening. This QTL coincided closely with a cluster of tyrosine kinase receptor genes (PDGFRA, KIT and KDR). Fitting SNP haplotypes for a 1 Mb region containing all 3 genes and centered on KIT accounted for all the variation attributed to this QTL. These data suggested that one of these 3 genes, or a gene in high linkage disequilibrium with them, was responsible for the majority of variation in degree of reddening. Two recombinants within this region identified PDGFRA as the strongest candidate gene. Functional analyses will be required to verify the role of PDGFRA and its interaction with MC1R to modify black coat color of Bos indicus influenced cattle. Advisors/Committee Members: Gill, Clare A. (advisor), Herring, Andy (committee member), Sanders, James O. (committee member).

Subjects/Keywords: MC1R; Reddening; Cattle; QTL; PDGFRA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hulsman, L. L. (2011). Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7830

Chicago Manual of Style (16^th Edition):

Hulsman, Lauren L. “Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population.” 2011. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7830.

MLA Handbook (7^th Edition):

Hulsman, Lauren L. “Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population.” 2011. Web. 23 Jan 2021.

Vancouver:

Hulsman LL. Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7830.

Council of Science Editors:

Hulsman LL. Identification of Loci Interacting with Melanocortin-1 Receptor to Modify Black Coat Color in an F2 Nellore-Angus Population. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7830

16. Meuchel, Meredith Christine. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows.

Degree: MS, Animal Breeding, 2005, Texas A&M University

URL: http://hdl.handle.net/1969.1/2513

► Reproductive and weight traits were analyzed for Angus (A), Brahman (B), Hereford (H), and Nellore (N) straightbred cows; F1 NA cows; 3/8N 5/8A cows and… (more)

Subjects/Keywords: heterosis; heterosis retention; Bos taurus; Bos indicus; productivity traits

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APA (6^th Edition):

Meuchel, M. C. (2005). Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/2513

Chicago Manual of Style (16^th Edition):

Meuchel, Meredith Christine. “Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows.” 2005. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/2513.

MLA Handbook (7^th Edition):

Meuchel, Meredith Christine. “Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows.” 2005. Web. 23 Jan 2021.

Vancouver:

Meuchel MC. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows. [Internet] [Masters thesis]. Texas A&M University; 2005. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/2513.

Council of Science Editors:

Meuchel MC. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for productivity traits in cows. [Masters Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/2513

17. Wright, Bradley Allen. Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits.

Degree: MS, Animal Breeding, 2007, Texas A&M University

URL: http://hdl.handle.net/1969.1/4978

► Data from 75 F2 Brahman-Hereford cows of four specific breed combinations, F2 HB (produced by F1 HB sires x F1 HB dams, where Ã¢ÂÂHBÃ¢ÂÂ refers… (more)

▼ Data from 75 F2 Brahman-Hereford cows of four specific breed combinations, F2 HB (produced by F1 HB sires x F1 HB dams, where Ã¢ÂÂHBÃ¢ÂÂ refers to cattle sired by Hereford bulls and out of Brahman cows), F2 BH (produced by F1 BH sires x F1 BH dams), HB x BH and BH x HB, were evaluated for maternal performance at the Texas A&M Research Center near McGregor. Differences between breed combinations were analyzed for calf crop born (CCB), calf crop weaned (CCW), calf survival (CS), birth weight (BW), weaning weight (WW), and cow weight at palpation (PW). The adjusted means for F2 HB, F2 BH, HB x BH, and BH x HB were 0.84 ÃÂ± 0.06, 0.57 ÃÂ± 0.07, 0.82 ÃÂ± 0.06, and 0.62 ÃÂ± 0.08, respectively, for CCW. F2 HB cows had a 0.27 ÃÂ± 0.09 higher percent calf crop weaned than F2 BH cows (P < 0.01) and a 0.22 ÃÂ± 0.11 higher percent calf crop weaned than BH x HB cows (P < 0.05). HB x BH cows had a 0.25 ÃÂ± 0.08 higher percent calf crop weaned than F2 BH (P < 0.01) and a 0.20 ÃÂ± 0.10 higher percent calf crop weaned than BH x HB cows (P < 0.05). As 6-year-olds, the adjusted means for cow weight at palpation for F2 HB, F2 BH, HB x BH, and BH x HB cows were 523.65 ÃÂ± 20.49 kg, 602.61 ÃÂ± 23.63 kg, 492.84 ÃÂ± 16.98 kg, and 515.93 ÃÂ± 22.96 kg, respectively. Averaged across all ages, HB x BH cows weighed 56.59 ÃÂ± 15.29 kg less than F2 BH cows (P < 0.001) and 41.11 ÃÂ± 18.92 kg less than BH x HB cows (P < 0.05). Also, F2 HB cows weighed 40.45 ÃÂ± 17.68 kg less than F2 BH cows (P < 0.05). In this herd, HB-sired cows had higher reproductive efficiency than BH-sired cows. Also, HB-sired cows tended to be lighter than BH-sired cows. Although these differences existed, exact causes could not be determined primarily due to confounding between the birth year of the cow and the sire breed of the cow. Advisors/Committee Members: Sanders, James O. (advisor), Herring, Andy D. (committee member), Womack, James E. (committee member).

Subjects/Keywords: Reciprocal differences; F2 Brahman-Hereford cows; Reproductive efficiency

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APA (6^th Edition):

Wright, B. A. (2007). Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4978

Chicago Manual of Style (16^th Edition):

Wright, Bradley Allen. “Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits.” 2007. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/4978.

MLA Handbook (7^th Edition):

Wright, Bradley Allen. “Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits.” 2007. Web. 23 Jan 2021.

Vancouver:

Wright BA. Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits. [Internet] [Masters thesis]. Texas A&M University; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/4978.

Council of Science Editors:

Wright BA. Reciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traits. [Masters Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4978

18. Wunderlich, Kris Rakowitz. Structural and functional characterization of the polled interval on bovine chromosome 1.

Degree: PhD, Genetics, 2008, Texas A&M University

URL: http://hdl.handle.net/1969.1/85933

► The horned condition in cattle is believed to be the wild type with morphogenesis primarily occurring after birth. The polled condition has existed since domestication… (more)

▼ The horned condition in cattle is believed to be the wild type with morphogenesis primarily occurring after birth. The polled condition has existed since domestication and has been selected for its economic importance. The polled locus has previously been mapped by genetic linkage analysis to the proximal region of bovine chromosome 1. In order to help us eventually identify the causative mutation, the objective of the study was to structurally and functionally characterize the polled interval from IFNAR1 to SOD1 on BTA1. Our hypothesis was that the polled locus is a tissue specific transcription factor that is expressed in the developing horn buds and acts directly or indirectly upon SOX9. A 2.5 Mb BAC contig and STS content map of the polled interval was constructed. Three candidate genes encoding transcription factors were identified within this region but only C21orf66 was expressed in the horn buds from 1 d old Bos indicus influenced calves. The C21orf66 gene has 18 exons, spans 30,976 bp of genomic DNA, and 144 SNP were identified. No single SNP discovered in C21orf66 can be attributed as the causative mutation. None of the genes from the polled interval were differentially expressed in skin and horn from 1 d old Bos indicus influenced calves. However, there were significant differences in the levels of expression of RUNX2, SOX9, BMP4, PRKCA, and FOXL2 in these samples. Expression of RUNX2 was localized to the osteoblasts, and both RUNX2 and SOX9 were expressed in sebaceous glands of the horn at 1 d of age. Histological examination of horns and scurs from newborn, 5 to 6 mo, and ~1.5 yr old Bos indicus influenced cattle suggest that horns form through intramembranous ossification. Based on the data presented herein, we propose that the polled locus is upstream of RUNX2 and SOX9 in the osteogenic pathway, and could have its primary effect on the differentiation of mesenchymal condensations. The genes IL10RB, SFRS15, C21orf66, OLIG1, OLIG2 and HUNK remain candidates for the polled locus and warrant further investigation. Advisors/Committee Members: Gill, Clare A. (advisor), Herring, Andy D. (committee member), Sanders, James O. (committee member), Spencer, Thomas E. (committee member).

Subjects/Keywords: Horn; Polled; Bovine; Chromosome 1; Gene Expression

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APA (6^th Edition):

Wunderlich, K. R. (2008). Structural and functional characterization of the polled interval on bovine chromosome 1. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/85933

Chicago Manual of Style (16^th Edition):

Wunderlich, Kris Rakowitz. “Structural and functional characterization of the polled interval on bovine chromosome 1.” 2008. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/85933.

MLA Handbook (7^th Edition):

Wunderlich, Kris Rakowitz. “Structural and functional characterization of the polled interval on bovine chromosome 1.” 2008. Web. 23 Jan 2021.

Vancouver:

Wunderlich KR. Structural and functional characterization of the polled interval on bovine chromosome 1. [Internet] [Doctoral dissertation]. Texas A&M University; 2008. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/85933.

Council of Science Editors:

Wunderlich KR. Structural and functional characterization of the polled interval on bovine chromosome 1. [Doctoral Dissertation]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/85933

19. Rhone, Jeffrey Andrew. Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females.

Degree: MS, Animal Breeding, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/3988

► The study was performed in the Edwards Plateau region of West Texas from the years of 1994 through 2004 and involved data collected on 291… (more)

▼ The study was performed in the Edwards Plateau region of West Texas from the years of 1994 through 2004 and involved data collected on 291 F1 Boer-Spanish and Spanish does and their 1,941 kids. Differences were estimated between dam types for growth traits, fertility traits, prolificacy, kid growth traits, survivability, longevity, and progeny growth. The mixed model analysis of variance procedure was used for all traits, except doe survivability where chi-square analysis was used. The F1 Boer-Spanish does were significantly heavier at birth than Spanish does, but there was no significant difference between the F1 Boer-Spanish and Spanish does for weaning weight. The F1 Boer-Spanish does had a significantly heavier body weight at breeding than the Spanish does (46 vs. 43 kg). No significant differences were found between breed types for fertility traits. Age of doe was a significant source of variation for fertility. There was no significant difference between the two doe breed types for number of kids born or number of kids weaned. Age of doe significantly affected both number of kids born and number of kids weaned. There was no significant differencebetween breed for total litter weight at weaning. For kid birth weight there was no significant difference between dam breed types. Kid weaning weight and pre-weaning average daily gain were not significantly different between dam breed types. Age at time of leaving the herd for all causes was 6.15 years for F1 Boer-Spanish does and 5.56 years for Spanish does (P = 0.06). There was no significant difference between breeds for proportions of does leaving the herd for the three main reasons. Although F1 Boer-Spanish does were significantly heavier for birth weight and body weight at breeding, there were no significant differences for weaning weights, reproduction, production, and progeny growth differences at weaning between F1 Boer- Spanish and Spanish does. When kid production was measured at weaning there was no difference between breeds. However the greater body weight of the F1 Boer-Spanish does at breeding suggests that if kid production was measured at a later endpoint, a significant difference may be realized. Advisors/Committee Members: Herring, Andy D. (advisor), Waldron, Daniel F. (advisor), Hart, Jeffrey D. (committee member), Sanders, James O. (committee member).

Subjects/Keywords: boer; spanish

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APA (6^th Edition):

Rhone, J. A. (2006). Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3988

Chicago Manual of Style (16^th Edition):

Rhone, Jeffrey Andrew. “Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females.” 2006. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/3988.

MLA Handbook (7^th Edition):

Rhone, Jeffrey Andrew. “Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females.” 2006. Web. 23 Jan 2021.

Vancouver:

Rhone JA. Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/3988.

Council of Science Editors:

Rhone JA. Estimation of reproductive, production, and progeny growth differences among f1 boer-spanish and spanish females. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3988

20. Simmons, Matthew Aaron. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.

Degree: MS, Animal Breeding, 2019, Texas A&M University

URL: http://hdl.handle.net/1969.1/186234

► Diverse expression of any given trait within a breed is required to protect the breed from the unwanted consequences of selective breeding. Within the cattle… (more)

▼ Diverse expression of any given trait within a breed is required to protect the breed from the unwanted consequences of selective breeding. Within the cattle industry, the fluid state of selective breeding trends, and consumer demand, creates a need for intermediate/moderate type cattle within individual breeds. These cattle have the ability to stabilize a given breed and bring it back from the extreme ends of the popular selection trends. This allows cattle breeders to change the genetics of their cattle, with relative speed, and meet consumer demands. Also, it protects individual breeds from harmful genetic mutations. This is evident in the increase in demand for intermediate cattle herds, like the Trask cattle, during the time period when most of the prominent Hereford breeders had carriers of snorter dwarfism in their herds. For this reason, it is important to preserve intermediate cattle lines like the Trask cattle, which have not conformed to popular cattle breeding trends. The genetic influence of various groups of ancestors on Trask bred bulls in current/recent herds was assessed using Wright’s Relationship Coefficient (Rvxvy), and the inbreeding coefficient (Fvx). Mean inbreeding coefficients of a group of 26 representative bulls from Trask bloodlines were compared to the mean inbreeding coefficient of all cattle in the available pedigree. Mean relatedness of the same 26 bulls with 1) a group of 15 prominent ancestors in the Hereford and Polled Hereford breeds, 2) a group of 30 ancestors that had the most descendants in the pedigree, and 3) a group of 19 prominent Trask line ancestors, was compared to the entire pedigree mean relatedness with the same groups. These comparisons were tested by 1) approximating a beta distribution representing the distribution of relatedness or inbreeding coefficients and testing the mean against that approximated distribution, and 2) employing resampling methods to generate a bootstrapped distribution and compare means to those distributions. These two analysis methods produced slightly different results; the beta P-values resulted in a failure to reject the H0, and the bootstrap resulted in the rejection of the Hv0. This difference highlighted the beta distribution method’s inability to account for the variation that occurs among samples drawn from a given population. The bootstrap resampling method was able to account for this variation because it draws numerous random samples to use in the calculation of the empirical P-values. Results provide a scientific assessment on the genetic influence of the Trask pedigree ancestors on the Trask bred bulls in recent/current herds. Testing against approximated beta (β) distributions may have resulted in type II errors (failure to reject the null hypothesis when it is in fact false). Mean relationship coefficients for the ancestors show the Trask herd ancestors had the closest relationship with the Trask bulls (mean Rxy = 0.208), followed by the top 30 ancestors (mean Rvxvy = 0.150), and then the key breed ancestors (mean Rxy = 0.132).… Advisors/Committee Members: Riggs, Penny K (advisor), Sanders, James O (advisor), Herring, Andy D (committee member), Riley, David G (committee member).

Subjects/Keywords: Linebreeding; Pedigree; Bootstrapping; Hereford; Cattle

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APA (6^th Edition):

Simmons, M. A. (2019). A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/186234

Chicago Manual of Style (16^th Edition):

Simmons, Matthew Aaron. “A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.” 2019. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/186234.

MLA Handbook (7^th Edition):

Simmons, Matthew Aaron. “A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.” 2019. Web. 23 Jan 2021.

Vancouver:

Simmons MA. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/186234.

Council of Science Editors:

Simmons MA. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/186234

21. Simmons, Matthew Aaron. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.

Degree: MS, Animal Breeding, 2019, Texas A&M University

URL: http://hdl.handle.net/1969.1/186194

► Diverse expression of any given trait within a breed is required to protect the breed from the unwanted consequences of selective breeding. Within the cattle… (more)

▼ Diverse expression of any given trait within a breed is required to protect the breed from the unwanted consequences of selective breeding. Within the cattle industry, the fluid state of selective breeding trends, and consumer demand, creates a need for intermediate/moderate type cattle within individual breeds. These cattle have the ability to stabilize a given breed and bring it back from the extreme ends of the popular selection trends. This allows cattle breeders to change the genetics of their cattle, with relative speed, and meet consumer demands. Also, it protects individual breeds from harmful genetic mutations. This is evident in the increase in demand for intermediate cattle herds, like the Trask cattle, during the time period when most of the prominent Hereford breeders had carriers of snorter dwarfism in their herds. For this reason, it is important to preserve intermediate cattle lines like the Trask cattle, which have not conformed to popular cattle breeding trends. The genetic influence of various groups of ancestors on Trask bred bulls in current/recent herds was assessed using Wright’s Relationship Coefficient (Rvxvy), and the inbreeding coefficient (Fvx). Mean inbreeding coefficients of a group of 26 representative bulls from Trask bloodlines were compared to the mean inbreeding coefficient of all cattle in the available pedigree. Mean relatedness of the same 26 bulls with 1) a group of 15 prominent ancestors in the Hereford and Polled Hereford breeds, 2) a group of 30 ancestors that had the most descendants in the pedigree, and 3) a group of 19 prominent Trask line ancestors, was compared to the entire pedigree mean relatedness with the same groups. These comparisons were tested by 1) approximating a beta distribution representing the distribution of relatedness or inbreeding coefficients and testing the mean against that approximated distribution, and 2) employing resampling methods to generate a bootstrapped distribution and compare means to those distributions. These two analysis methods produced slightly different results; the beta P-values resulted in a failure to reject the H0, and the bootstrap resulted in the rejection of the Hv0. This difference highlighted the beta distribution method’s inability to account for the variation that occurs among samples drawn from a given population. The bootstrap resampling method was able to account for this variation because it draws numerous random samples to use in the calculation of the empirical P-values. Results provide a scientific assessment on the genetic influence of the Trask pedigree ancestors on the Trask bred bulls in recent/current herds. Testing against approximated beta (β) distributions may have resulted in type II errors (failure to reject the null hypothesis when it is in fact false). Mean relationship coefficients for the ancestors show the Trask herd ancestors had the closest relationship with the Trask bulls (mean Rxy = 0.208), followed by the top 30 ancestors (mean Rvxvy = 0.150), and then the key breed ancestors (mean Rxy = 0.132).… Advisors/Committee Members: Riggs, Penny K (advisor), Sanders, James O (advisor), Herring, Andy D (committee member), Riley, David G (committee member).

Subjects/Keywords: Linebreeding; Pedigree; Bootstrapping; Hereford; Cattle

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Simmons, M. A. (2019). A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/186194

Chicago Manual of Style (16^th Edition):

Simmons, Matthew Aaron. “A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.” 2019. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/186194.

MLA Handbook (7^th Edition):

Simmons, Matthew Aaron. “A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle.” 2019. Web. 23 Jan 2021.

Vancouver:

Simmons MA. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/186194.

Council of Science Editors:

Simmons MA. A Quantitative Genetic Analysis of the Ancestry of Neil Trask Line Bred Hereford Cattle. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/186194

Texas A&M University

22. Funkhouser, Rena Rebecca. Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production.

Degree: MS, Animal Breeding, 2008, Texas A&M University

URL: http://hdl.handle.net/1969.1/85987

► Aggressiveness, nervousness, flightiness, gregariousness and overall disposition were evaluated in F2 Nellore-Angus embryo transfer calves (n = 443) from 13 full sib families and in… (more)

▼ Aggressiveness, nervousness, flightiness, gregariousness and overall disposition were evaluated in F2 Nellore-Angus embryo transfer calves (n = 443) from 13 full sib families and in half Bos indicus, half Bos taurus natural service calves (n = 259) from 4 paternal half sib families. Calves were born from 2003 to 2007, and evaluated shortly after weaning. Steers were evaluated shortly before slaughter for all 5 disposition traits and at slaughter for overall disposition. Heifers were evaluated for overall disposition at calving every year. Scores ranged from 1 to 9, with 1 being docile and 9 being unruly, except at calving where scores ranged from 1 to 5. Between sires for overall disposition, calves by 297J were lowest at weaning (2.83), before slaughter (2.84), and at slaughter (2.45) and second lowest in first calf heifers (2.27). Calves by 437J were highest at weaning (4.10), before slaughter (3.54), at slaughter (2.89) and in first calf heifers (3.10). Bulls had the lowest scores at weaning (2.54), although the number was small (n=10); females were the highest (4.01), and steers were intermediate (3.70). All 5 weaning traits were correlated (P < 0.05) with each other (0.73 to 0.96). The correlation of recipient disposition and weaning disposition of the calves was 0.12 (P < 0.05). Aggressiveness was not significantly correlated with other component traits before slaughter but was with overall disposition (0.19, P < 0.05). All other traits were significantly inter-correlated (0.60 to 0.97). Disposition at weaning was correlated with disposition before slaughter (0.43, P < 0.05). Slaughter disposition was correlated with weaning disposition (0.30, P < 0.001) and disposition before slaughter (0.27, P < 0.001). Disposition in first calf heifers was correlated with weaning disposition (0.34, P < 0.001) and disposition in second calf females (0.53, P < 0.0001). The results indicate that both genetics and recipient disposition affect calf disposition at weaning, calves with better dispositions at weaning have better dispositions later in life, and there is sufficient variability within and between these full sib and half sib families for use in QTL analysis for major genes for disposition in Nellore-Angus cross cattle. Advisors/Committee Members: Sanders, James O. (advisor), Herring, Andy D. (committee member), Gill, Clare (committee member).

Subjects/Keywords: disposition; cattle

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APA (6^th Edition):

Funkhouser, R. R. (2008). Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/85987

Chicago Manual of Style (16^th Edition):

Funkhouser, Rena Rebecca. “Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production.” 2008. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/85987.

MLA Handbook (7^th Edition):

Funkhouser, Rena Rebecca. “Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production.” 2008. Web. 23 Jan 2021.

Vancouver:

Funkhouser RR. Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production. [Internet] [Masters thesis]. Texas A&M University; 2008. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/85987.

Council of Science Editors:

Funkhouser RR. Evaluation of disposition scores in Bos indicus/Bos taurus cross calves at different stages of production. [Masters Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/85987

Texas A&M University

23. Gladney, Cody Jack. Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows.

Degree: MS, Animal Breeding, 2008, Texas A&M University

URL: http://hdl.handle.net/1969.1/85988

► Sire and family effects were evaluated for calf growth, udder and teat conformation, and reproduction traits in 2- to 4- yr-old cows from the McGregor… (more)

Subjects/Keywords: Bos indicus; cow productivity; genetics; udder traits; reproduction

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APA (6^th Edition):

Gladney, C. J. (2008). Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/85988

Chicago Manual of Style (16^th Edition):

Gladney, Cody Jack. “Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows.” 2008. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/85988.

MLA Handbook (7^th Edition):

Gladney, Cody Jack. “Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows.” 2008. Web. 23 Jan 2021.

Vancouver:

Gladney CJ. Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows. [Internet] [Masters thesis]. Texas A&M University; 2008. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/85988.

Council of Science Editors:

Gladney CJ. Evaluation of udder and teat characteristics, calf growth, and reproduction in young Bos indicus-Bos taurus cows. [Masters Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/85988

Texas A&M University

24. Cunningham, Samantha Fern. Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity.

Degree: MS, Animal Breeding, 2005, Texas A&M University

URL: http://hdl.handle.net/1969.1/2512

► Birth (BW) (n = 1,107) and weaning weight (WW) (n = 1,024), pregnancy rate (PR) (n = 1,255), calf crop born (CCB) (n = 1,232),… (more)

▼ Birth (BW) (n = 1,107) and weaning weight (WW) (n = 1,024), pregnancy rate (PR) (n = 1,255), calf crop born (CCB) (n = 1,232), calf crop weaned (CCW) (n = 1,225), and cow??s weight at palpation (CW) (n = 1,403) were evaluated from 1994 to 2004 in 143 F1 females who were sired by Brahman (B), Boran (Bo), and Tuli (T) bulls and who were out of Angus and Hereford cows. In 2004, mouth scores (MS) (n = 71) were assigned to the remaining females. PR, CCB, CCW, CW, and BCS were evaluated using a model that consisted of sire of dam breed, dam of dam breed, and calf??s birth year/age of dam as fixed effects. Sire of dam within sire breed of dam and dam within sire of dam within sire breed of dam were used as random effects. BW and WW were analyzed using the same model including calf??s gender. Two-way interactions were tested for significance. Year/age was significant for all traits (P < 0.05). Adjusted means for BW for calves out of cows by B, Bo, and T sires were 35.66, 35.38, and 35.59 kg respectively, and were not different (P > 0.05). Adjusted means for WW for calves out of cows by B, Bo, and T sires were 233.4, 220.1, and 208.2 kg respectively, and were significantly different. For both BW and WW, male calves were heavier (P < 0.05) than females. Adjusted means for PR for females sired by B, Bo, and T bulls were 0.914, 0.945, and 0.920, and were not different (P > 0.05). Adjusted means for CCB for females sired by B, Bo, and T bulls were 0.890, 0.943, and 0.910 respectfully, and Bo was higher (P < 0.05) than B. CCW showed the same ranking as CCB with adjusted means of 0.834, 0.887, and 0.857 for cows by B, Bo, and T bulls, with Bo being higher (P < 0.05) than B. CW adjusted means, in the fall of 2002, were 594.29, 519.38, and 517.3 kg. B-sired females were heavier (P < 0.05) than Bo- or T- sired cows. More Bo- (P = 0.013) and B-sired (P = 0.003) cows had solid mouths in 2004 than T-sired cows. Advisors/Committee Members: Herring, Andy D. (advisor), Sanders, James O. (advisor), Derr, James N. (committee member).

Subjects/Keywords: maternal performance; cow longevity

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APA (6^th Edition):

Cunningham, S. F. (2005). Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/2512

Chicago Manual of Style (16^th Edition):

Cunningham, Samantha Fern. “Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity.” 2005. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/2512.

MLA Handbook (7^th Edition):

Cunningham, Samantha Fern. “Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity.” 2005. Web. 23 Jan 2021.

Vancouver:

Cunningham SF. Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity. [Internet] [Masters thesis]. Texas A&M University; 2005. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/2512.

Council of Science Editors:

Cunningham SF. Evaluation of F1 cows sired by Brahman, Boran, and Tuli for reproductive and maternal performance and cow longevity. [Masters Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/2512

Texas A&M University

25. Maiga, Assalia Hassimi. Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits.

Degree: MS, Animal Breeding, 2007, Texas A&M University

URL: http://hdl.handle.net/1969.1/4890

► Birth weight (BW) (n =1277) and weaning weight (WW) (n = 1090) of calves, pregnancy rate (PR) (n = 1386), calf crop born (CCB) (n… (more)

▼ Birth weight (BW) (n =1277) and weaning weight (WW) (n = 1090) of calves, pregnancy rate (PR) (n = 1386), calf crop born (CCB) (n = 1386), calf crop weaned (CCW) (n = 1294), cowÃ¢ÂÂs weight at palpation (CW) (n = 1474) and cow body condition score (BCS) (n = 1473) were evaluated from 1994 to 2006 in 143 F1 cows sired by Brahman (B), Boran (Bo) and Tuli (T) bulls and born to Angus and Hereford cows. Mouth scores (MS) (n = 139) were assigned to the remaining cows in 2004 and 2005. Fixed effects included sire breed of cow, dam breed of cow, and calfÃ¢ÂÂs birth year/age of cow; random effects included cow and sire of cow. BW and WW were evaluated using the same model and adding gender for both and age for WW. All two-way interactions were tested for significance. CalfÃ¢ÂÂs birth year/age of dam was significant for all traits (P < 0.05) except WW. BW for calves out of F1 B, Bo and T bulls were 35.08, 34.76 and 34.87 kg, respectively, and were not different. WW differed (P < 0.05) for calves out of F1 B, Bo and T cows (235.87, 221.10 and 208.35 kg, respectively). PR (0.922, 0.955 and 0.936, respectively), CCB (0.881, 0.931, 0.890, respectively), CCW (0.848, 0.898 and 0.869, respectively), did not differ among F1 B, Bo and T cows. CW when cows were 8- or 9-year old were 600.78, 514.63 and 513.14 kg, respectively, for F1 B, Bo and T cows, with those sired by B being heaviest (P < 0.05). BCS for B-, Bo- and T-sired cows were 5.23, 5.48 and 5.18, respectively, with F1 Bo cows having highest scores. Higher MS (P < 0.05) were assigned to Bo and B-sired cows (0.95 and 0.94, respectively) compared to T-sired cows (0.78), when both broken and solid incisors were scored 1, and smooth scored 0. When both smooth and broken were scored 0, and solid were scored 1, higher scores were assigned to B- (0.53) compared to T-sired cows (0.24), the Bo-sired cows being intermediate. Higher reproductive rates were found for Boran-sired cows, but Brahman-sired cows weaned heavier calves. Advisors/Committee Members: Sanders, James O. (advisor), Herring, Andy D. (committee member), Kothmann, Mort M. (committee member).

Subjects/Keywords: Tropically adapted breeds; cow productivity; longevity

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APA (6^th Edition):

Maiga, A. H. (2007). Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4890

Chicago Manual of Style (16^th Edition):

Maiga, Assalia Hassimi. “Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits.” 2007. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/4890.

MLA Handbook (7^th Edition):

Maiga, Assalia Hassimi. “Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits.” 2007. Web. 23 Jan 2021.

Vancouver:

Maiga AH. Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits. [Internet] [Masters thesis]. Texas A&M University; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/4890.

Council of Science Editors:

Maiga AH. Comparison of F1 cows sired by Brahman, Boran and Tuli bulls for reproductive, maternal, and cow longevity traits. [Masters Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4890

Texas A&M University

26. Neufeld Arce, Rodney Oliver. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows.

Degree: MS, Animal Breeding, 2007, Texas A&M University

URL: http://hdl.handle.net/1969.1/4894

► Reproductive, maternal and weight traits were analyzed for Angus (A), Brahman (B), Hereford (H), and Nellore (N) straightbred cows; F1 NA; 3/8N 5/8A cows; and… (more)

▼ Reproductive, maternal and weight traits were analyzed for Angus (A), Brahman (B), Hereford (H), and Nellore (N) straightbred cows; F1 NA; 3/8N 5/8A cows; and four breed composite cows (BANH) at the McGregor Research Station in Central Texas. Heterosis was estimated for calf crop born (CCB) (n = 1,698), calf crop weaned (CCW) (n = 1,698), calf survival (CS) (n = 1,388), birth weight (BW) (n = 1380), weaning weight (WW) (n = 1,198), and cow weight at palpation (PWT) (n = 1,929) by linear contrasts for cow breed and cow breed group. F1 NA and the quarter breed composite BANH dam group expressed significant (P < 0.0001) heterosis for calf crop born and calf crop weaned. The 3/8 N 5/8 Aa produced by matings of 3/4 A 1/4 N bulls to NA dams expressed significantly more heterosis for CCB (P < 0.0001) and CCW (P < 0.01), while the 3/8 N 5/8 Ac dams expressed less heterosis than predicted from the dominance model for both traits. For CS the 3/8 N 5/8 Aa expressed the same amount of heterosis as predicted from the dominance model of 0.05, while the 3/8 N 5/8 Ab and 3/8 N 5/8 Ac dams expressed less heterosis than predictions based on the dominance model. Heterosis estimates were only significantly higher (P < 0.10) for BANHb dams than expectations from the dominance model. For BW all the BANH cows expressed significant heterosis except for the BANH2 cows which expressed significant (P < 0.05) negative heterosis of -0.96 kg. Calves out of F1 NA cows were heaviest at weaning with 239 kg. All BANH cows expressed significant (P < 0.0001) heterosis for weaning weight except for the BANHc cows. These heterosis estimates were higher than those expected from the dominance model for BANHb and BANH2 cows, while the heterosis estimate was slightly lower in BANHa cows and similar for BANHc cows. All 3/8 N 5/8 A cows expressed less heterosis for WW than prediction from the dominance model. Nellore cows were the heaviest at four years of age with 542 kg. Only the BANHb and BANHc cows expressed significant (P < 0.05) heterosis for PWT. None of the 3/8 N 5/8 A cows expressed heterosis for cow weight at palpation. Results from this study showed that heterosis levels expressed by the different crossbred cow types were generally equal or higher to those predicted by the dominance model. Advisors/Committee Members: Sanders, James O. (advisor), Hamilton, Wayne (committee member), Herring, Andy D. (committee member).

Subjects/Keywords: Crossbreeding; heterosis; Bos indicus; Bos taurus

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APA (6^th Edition):

Neufeld Arce, R. O. (2007). Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4894

Chicago Manual of Style (16^th Edition):

Neufeld Arce, Rodney Oliver. “Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows.” 2007. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/4894.

MLA Handbook (7^th Edition):

Neufeld Arce, Rodney Oliver. “Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows.” 2007. Web. 23 Jan 2021.

Vancouver:

Neufeld Arce RO. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows. [Internet] [Masters thesis]. Texas A&M University; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/4894.

Council of Science Editors:

Neufeld Arce RO. Evaluation of heterosis and heterosis retention in Bos taurus-Bos indicus crossbred cattle for reproductive and maternal traits in cows. [Masters Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4894

Texas A&M University

27. Key, Kelli Loren. Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows.

Degree: PhD, Animal Breeding, 2005, Texas A&M University

URL: http://hdl.handle.net/1969.1/1417

► Reproductive, maternal, and weight traits were analyzed for Angus (A), Brahman (B), and Hereford (H) straightbred cows; F1 and F2 BA and BH cows; and… (more)

Subjects/Keywords: Heterosis; Reproduction; Brahman

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APA (6^th Edition):

Key, K. L. (2005). Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1417

Chicago Manual of Style (16^th Edition):

Key, Kelli Loren. “Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows.” 2005. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/1417.

MLA Handbook (7^th Edition):

Key, Kelli Loren. “Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows.” 2005. Web. 23 Jan 2021.

Vancouver:

Key KL. Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows. [Internet] [Doctoral dissertation]. Texas A&M University; 2005. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/1417.

Council of Science Editors:

Key KL. Heterosis and heterosis retention for reproductive and maternal traits in Brahman - British crossbred cows. [Doctoral Dissertation]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/1417

Texas A&M University

28. Choi, Jung Woo. Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes.

Degree: PhD, Animal Science, 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7166

► The objectives of this study were to identify signatures of selection in Bos taurus beef and dairy cattle populations and to annotate regions of selection… (more)

Subjects/Keywords: SNP; Signatures of selection; Bos taurus

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APA (6^th Edition):

Choi, J. W. (2010). Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7166

Chicago Manual of Style (16^th Edition):

Choi, Jung Woo. “Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes.” 2010. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7166.

MLA Handbook (7^th Edition):

Choi, Jung Woo. “Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes.” 2010. Web. 23 Jan 2021.

Vancouver:

Choi JW. Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7166.

Council of Science Editors:

Choi JW. Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7166

Texas A&M University

29. Novosad, Aaron M. Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls.

Degree: MS, Physiology of Reproduction, 2007, Texas A&M University

URL: http://hdl.handle.net/1969.1/4837

► Fertility Associated Antigen (FAA) produced by the accessory sex glands and contained within the seminal fluid binds heparin and facilitates capacitation in ejaculated sperm, resulting… (more)

▼ Fertility Associated Antigen (FAA) produced by the accessory sex glands and contained within the seminal fluid binds heparin and facilitates capacitation in ejaculated sperm, resulting in improved fertility in bulls capable of producing the protein. In this study, a total of 206 bulls derived from three populations were evaluated for the presence or absence of FAA through utilization of the Repro Test at three semen collections over a 60-d period. Across all collections, the percentage of FAA Negative bulls ranged from 13.64 to 36.11%. Within the three populations, 32, 33, and 67 bulls were observed at three different collections, of which 3.03, 9.09 and 4.48% were FAA Negative at all three collections, respectively. Furthermore, 27.27, 33.33, and 20.90% of bulls were observed to have variations within their FAA status after providing an initial FAA Positive result, respectively. Bull age, sperm concentration, progressive forward motility, percent normal sperm, ejaculate volume, and scrotal circumference were determined to be significantly different between FAA Negative and FAA Positive bulls in at least one collection. However, no consistent trend was observed across populations, or collections within a population, with regard to a relationship between these variables and FAA. Furthermore, of fourteen bulls that produced an ejaculate in which no sperm was detected, 78.57% (n=11) were FAA Positive despite the lack of sperm within the ejaculate. No single variable commonly measured to determine bull fertility was consistent in predicting the FAA status of bulls. The ability to produce FAA precedes puberty and the Repro Test can be used to identify FAA in prepuberal bulls. However, a large percentage of bulls, both prepuberal and peripuberal, are capable of displaying variation in their FAA status (as determined by the Repro Test) over time. Advisors/Committee Members: Forrest, David W. (advisor), Sprott, L. R. (advisor), Barling, Kerry (committee member), Sanders, James O. (committee member).

Subjects/Keywords: Fertility Associated Antigen; FAA; Heparin; HBP

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APA (6^th Edition):

Novosad, A. M. (2007). Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4837

Chicago Manual of Style (16^th Edition):

Novosad, Aaron M. “Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls.” 2007. Masters Thesis, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/4837.

MLA Handbook (7^th Edition):

Novosad, Aaron M. “Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls.” 2007. Web. 23 Jan 2021.

Vancouver:

Novosad AM. Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls. [Internet] [Masters thesis]. Texas A&M University; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/4837.

Council of Science Editors:

Novosad AM. Pubertal changes in the expression of fertility associated antigen in Bos indicus and Bos taurus bulls. [Masters Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4837

Texas A&M University

30. Amen, Tonya Sue. Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers.

Degree: PhD, Animal Breeding, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009

► Feed efficiency in fed F2 Nellore-Angus steers produced through embryo transfer was evaluated using two methods: residual feed intake (RFI) and NRC-based model predicted residual… (more)

Subjects/Keywords: feed efficiency; temperament; cattle

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APA (6^th Edition):

Amen, T. S. (2009). Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009

Chicago Manual of Style (16^th Edition):

Amen, Tonya Sue. “Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009.

MLA Handbook (7^th Edition):

Amen, Tonya Sue. “Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers.” 2009. Web. 23 Jan 2021.

Vancouver:

Amen TS. Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009.

Council of Science Editors:

Amen TS. Feed efficiency, carcass, and temperament traits in F2 Nellore-Angus steers. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009

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