subject:(breeding soundness)

1. Monday, Jessica Dawn. Evaluation of peripubertal replacement breeding animals in beef herds.

Degree: MSin Veterinary Biomedical Science, Department of Clinical Sciences, 2017, Kansas State University

URL: http://hdl.handle.net/2097/35530

► The selection of young replacement animals can have a significant impact on beef herd reproductive performance. Replacement heifers can be utilized to improve reproductive performance… (more)

▼ The selection of young replacement animals can have a significant impact on beef herd reproductive performance. Replacement heifers can be utilized to improve reproductive performance by replacing mature animals that failed to meet the production with young, cycling heifers that can have the potential of improving the reproductive momentum of a herd. The use of yearling bulls in natural breeding herds has the advantage of shortening the generational interval of the herd and has the potential of reducing the cost per cow exposed as additions to the bull battery. This thesis involves two studies that investigated methods used for the selection of peripubertal replacement animals in beef herds. The first study evaluated the ability of the novel Ready-Intermediate-Problem (RIP) replacement heifer evaluation matrix to classify heifers into groups that allow producers to select for replacements that meet production goals. Beef heifers (n=341) were classified according to the RIP matrix guidelines and then exposed to AI breeding, bull breeding, or a combination of both as per the management plans for each participating herd. Following breeding season the heifers were evaluated to determine pregnancy status, pregnancy status to single AI exposure, days bred, and the number of 21 day cycles needed during breeding season to become pregnant. After breeding season, 298 (87%) of the heifers were pregnant, 204 (68%) of which became pregnant in the first 21 days of the breeding season. Probability of overall pregnancy and pregnancy after single AI exposure was not significantly associated with RIP classification. There was a significant interaction in RIP classification by 21 day cycle. The second study was a retrospective study using BSE result data to determine the proportion of yearling beef bulls that are classified as satisfactory potential breeders when reevaluated after failing their initial breeding soundness evaluation (BSE) and to identify any predictive factors at initial BSE for satisfactory performance at revaluation. The study included 2,805 beef bulls between 11 and 14 months of age at first BSE evaluated at KABSU from 2006 to 2014. Generalized linear mixed models were created to assess potential associations among breed, age, and interaction between breed and age and passing the initial evaluation and identify predictive factors for risk of passing BSE after initial failure. The majority (93%) of the study bulls passed one of up to three BSEs. There was a significant interaction between age and breed of bull at initial BSE. Identification of suitable peripubertal replacement animals that will improve herd reproductive performance remains a challenge for producers. There are several factors that can affect replacement animals’ ability to perform according to expectations at the beginning of the breeding season. Classification of heifers into categories that can predict performance during breeding season with reasonable confidence can assist producers in identifying heifers that complement the reproductive… Advisors/Committee Members: Robert L. Larson.

Subjects/Keywords: Breeding soundness evaluation; Theriogenology; Replacement heifer; Reproductive performance; Reproductive tract scoring

…important for breeding soundness. Ideally the BSE of yearling bull cohorts should be scheduled… …Breeding soundness evaluation Hopkins and Spitzer co-authored a review article in 1997 that… …discussed the 1993 revised Society for Theriogenology (SFT) breeding soundness… …Satisfactory breeding soundness evaluation in yearling bulls Producers wishing to use yearling bulls… …information can be used to select bulls and schedule breeding soundness evaluations for when the…

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APA (6^th Edition):

Monday, J. D. (2017). Evaluation of peripubertal replacement breeding animals in beef herds. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/35530

Chicago Manual of Style (16^th Edition):

Monday, Jessica Dawn. “Evaluation of peripubertal replacement breeding animals in beef herds.” 2017. Masters Thesis, Kansas State University. Accessed January 17, 2021. http://hdl.handle.net/2097/35530.

MLA Handbook (7^th Edition):

Monday, Jessica Dawn. “Evaluation of peripubertal replacement breeding animals in beef herds.” 2017. Web. 17 Jan 2021.

Vancouver:

Monday JD. Evaluation of peripubertal replacement breeding animals in beef herds. [Internet] [Masters thesis]. Kansas State University; 2017. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2097/35530.

Council of Science Editors:

Monday JD. Evaluation of peripubertal replacement breeding animals in beef herds. [Masters Thesis]. Kansas State University; 2017. Available from: http://hdl.handle.net/2097/35530

Kansas State University

2. Fountain, Tara. Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls.

Degree: MSin Biomedical Sciences, Department of Clinical Sciences, 2020, Kansas State University

URL: http://hdl.handle.net/2097/40882

► The common thread of this research was to identify factors that improve efficiency and subsequent profitability for cow-calf producers. The objective of the literature review… (more)

▼ The common thread of this research was to identify factors that improve efficiency and subsequent profitability for cow-calf producers. The objective of the literature review was to evaluate factors, such as nutrition, breed, season of birth, exposure to cycling females and hormones that influenced puberty in peri-pubertal bulls. Finding factors that influence puberty are important for both for seedstock producers and commercial cattlemen. Bulls that attain puberty earlier have a higher likelihood of passing the breeding soundness examination by the time of marketing. The objective of the first study was to determine if factors such as herd size, breeding season length, body condition of cow at mid-gestation, or the timing of breeding season affected the likelihood of pregnancy at the end of the first 21-day interval and at the end of the breeding season. Data were collected by convenience sampling from herds (n=241) consisting of 8,217 head located in the Midwest and Great Plains regions of the US from 2012 to 2017. Pregnancy diagnosis data were recorded in either 20- or 21-day intervals. A logistic regression model was used to evaluate the effect of the relevant factors (herd size category, breeding season length category, body condition score category, and timing of breeding season category) on the probability of pregnancy status at two different time-points (21-day and end of breeding season). Overall, an average 53.6% of cattle across all herds were pregnant by the end of the first 21-day interval, and an average 85.2% of cattle across all herds were pregnant by the end of the breeding season. Herds with short or medium breeding season lengths (<63 days or 63-84 days) had increased probability of pregnancy (65% and 58%, respectively) for the first 21-day interval compared to herds with a long breeding season (49%). Cows in thin body condition at the time of pregnancy diagnosis had reduced probability of having become pregnant during both the first 21-day interval (44%) and the entire breeding season (64%) when compared to cows in moderate (62%, 86%) and fleshy (66%, 91%) condition. Herds with less than 50 head had reduced probability of pregnancy (51%, 78%) as compared to medium sized (50-99 head) herds (63%, 84%) for both the 21-day interval and overall breeding season. Herds that started the breeding season in the fall had higher probability of pregnancy at the end of the breeding season (88%) as compared to spring start dates (82%). Management factors such as breeding season length, body condition score, herd size, and timing of breeding season had significant impacts on the probability of pregnancy. In the future, more research needs to be conducted to evaluate the economic impacts of these management choices. The focus of the next study was identifying bulls at a young age with higher likelihood of passing a breeding soundness examination as yearlings. Finding these bulls at weaning may improve management options to optimize production efficiency and profitability. The objective of this study was to… Advisors/Committee Members: Robert L. LarsonBradley J. White.

Subjects/Keywords: Efficiency; Fertility; Breeding Soundness Examination; Pregnancy Interval

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

APA (6^th Edition):

Fountain, T. (2020). Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/40882

Chicago Manual of Style (16^th Edition):

Fountain, Tara. “Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls.” 2020. Masters Thesis, Kansas State University. Accessed January 17, 2021. http://hdl.handle.net/2097/40882.

MLA Handbook (7^th Edition):

Fountain, Tara. “Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls.” 2020. Web. 17 Jan 2021.

Vancouver:

Fountain T. Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls. [Internet] [Masters thesis]. Kansas State University; 2020. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2097/40882.

Council of Science Editors:

Fountain T. Evaluating factors influencing pregnancy in beef cows and evaluating factors at weaning influencing ability to pass breeding soundness examination in beef bulls. [Masters Thesis]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40882

Massey University

3. Chawala, Aluna Raphael. The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle.

Degree: MS, Animal Science, 2011, Massey University

URL: http://hdl.handle.net/10179/2762

► The objective of this study was to estimate genetic parameters and breed and crossbreeding effects on incidence of recorded clinical lameness (RCL) in New Zealand… (more)

▼ The objective of this study was to estimate genetic parameters and breed and crossbreeding effects on incidence of recorded clinical lameness (RCL) in New Zealand dairy cattle. Herd records from 76,357 cows distributed in 155 herds dedicated to the Livestock Improvement Corporation (LIC) sire-proving scheme during the 2005 to 2009 milking seasons were used to estimate the phenotypic, additive genetic, permanent environmental and residual variances of RCL in Holstein-Friesian (F), Jersey (J) and crossbred (FxJ) dairy cattle. RCL incident was coded “1” for cows that had at least one event of RCL at any day during lactation and a “0” code was used for cows without a RCL incidence. Genetic parameters and crossbreeding effects on RCL were estimated with a repeatability animal model, across breeds using restricted maximum likelihood methodology. The predicted mean incidence of RCL per herd was 7.74% with a range of 2% to 34%. Heritability estimate for the incidence of RCL for all lactations (1st to 10th lactation) was 0.016 ± 0.003 (± SE) and the repeatability was 0.071 ± 0.005. The heritability estimate of RCL using only first lactation records was 0.05 ± 0.01 (± SE). Jersey cows had a lower mean (± SE) incidence of RCL than F cattle (J: 6.67 ± 1.50%; JxF: 6.89 ± 1.50%; F: 8.83 ± 1.50%). The effect of first cross (F1) FxJ crossbred was -1.2 ± 0.3% (± SE), representing a mean 16% reduction in RCL compared to an average of the parental pure breed J and F cattle. There was considerable variation (-5 to 8%) between sire estimated breeding values for RCL, suggesting that sire selection across breed and within breed could result in increased genetic resistance to RCL in New Zealand dairy cattle. A significant (P<0.05) reduction in mean (± SD) milk solid yield per day was found in cows with RCL (1.40± 0.0012 kg) compared to cows without RCL (1.43± 0.0045 kg). Cattle in first lactation had a significantly higher incidence of RCL than cows in subsequent lactations (7.6 ± 0.1%, 4.6 ± 0.1%, 5.2 ± 0.1%, 6.3 ± 0.1% and 7.0 ± 0.2% (± SE) for first, second, third, fourth and fifth lactations, respectively). These results suggest that selection for resistance to lameness will result in a low rate of genetic gain but using Jersey sires can be an alternative to increase genetic resistance to lameness in New Zealand dairy cattle.

Subjects/Keywords: Lameness in cattle; Dairy cattle; Breeding; Diseases; Soundness; New Zealand; Dairy cows; Crossbreeding; Recorded clinical lameness; Cross-breeding

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

APA (6^th Edition):

Chawala, A. R. (2011). The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/2762

Chicago Manual of Style (16^th Edition):

Chawala, Aluna Raphael. “The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle.” 2011. Masters Thesis, Massey University. Accessed January 17, 2021. http://hdl.handle.net/10179/2762.

MLA Handbook (7^th Edition):

Chawala, Aluna Raphael. “The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle.” 2011. Web. 17 Jan 2021.

Vancouver:

Chawala AR. The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle. [Internet] [Masters thesis]. Massey University; 2011. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10179/2762.

Council of Science Editors:

Chawala AR. The effect of breed and crossbreeding on the incidence of recorded lameness in the New Zealand dairy cattle. [Masters Thesis]. Massey University; 2011. Available from: http://hdl.handle.net/10179/2762

Universiteit Utrecht

4. Draaisma, H.S. Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification.

Degree: 2015, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/315633

► The objective of the study was to evaluate the use of scrotal surface infrared thermography in breeding soundness classification under field conditions in tropical Costa… (more)

Subjects/Keywords: infrared thermography; bulls; breeding soundness classification

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

APA (6^th Edition):

Draaisma, H. S. (2015). Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/315633

Chicago Manual of Style (16^th Edition):

Draaisma, H S. “Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification.” 2015. Masters Thesis, Universiteit Utrecht. Accessed January 17, 2021. http://dspace.library.uu.nl:8080/handle/1874/315633.

MLA Handbook (7^th Edition):

Draaisma, H S. “Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification.” 2015. Web. 17 Jan 2021.

Vancouver:

Draaisma HS. Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification. [Internet] [Masters thesis]. Universiteit Utrecht; 2015. [cited 2021 Jan 17]. Available from: http://dspace.library.uu.nl:8080/handle/1874/315633.

Council of Science Editors:

Draaisma HS. Application of infrared scrotal thermography (IRST) under field conditions in bulls extensively managed in tropical Costa Rica, and its relationship with spermiogramme, clinical variables and final breeding soundness classification. [Masters Thesis]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/315633

University of Saskatchewan

5. Helbig, Larissa. Onset of puberty and seasonal fertility in bison bulls.

Degree: 2005, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-04252005-122338

► Onset of puberty was observed in 12 bison bulls by the collection of semen at monthly intervals for 12 months beginning at 13 months of… (more)

▼ Onset of puberty was observed in 12 bison bulls by the collection of semen at monthly intervals for 12 months beginning at 13 months of age. Onset of puberty was defined as the time in development when an ejaculate contained a minimum of 50x106 sperm showing at least 10% progressive motility. At each collection, data were recorded on body weight, semen quality, fecal testosterone concentration, and physical development. Semen was evaluated for gross motility, individual progressive motility, sperm morphology, sperm concentration and volume. From these data bison bulls attained onset of puberty at an average age of 16.5 months and an average body weight of 353 ± 52.8 kg. Age was the greatest determining factor for onset of puberty in this group of bulls. Monthly abattoir collections of epididymal sperm (n=288) and testicular tissue (n=120) were evaluated to determine if bison bulls undergo seasonal changes in sperm production. Although epididymal sperm morphology did not give any indication of seasonal variation, the histological study of testicular tissue showed greater seminiferous tubule diameter (27.0 ± 4.3 ìm) during the breeding months (July, August and September) than during any other seasons. Semen collected at 4 different occasions during the year (June, November, January, and April) from live mature breeding bulls (n=21) was used to verify data collected from abattoir samples. Semen from mature bulls showed a significantly greater proportion of normal sperm in June than in November (73.8 ± 9.1%; 44.1 ± 24.3%), respectively. There was little improvement in sperm morphology at the January sampling but in April morphology improved to a level close to that observed in June. Fecal testosterone concentrations were highest in June (128.6 ± 67.4 ng/g) and lowest in April (48.5 ± 33.3 ng/g). Although there was no clear seasonal trend in sperm morphology from bulls sampled at the abattoir, mature bulls showed slight seasonal variations in semen quality. Advisors/Committee Members: Haigh, Jerry, Woodbury, Murray R., Rawlings, Norman C., Flood, Peter F., Carruthers, Terry D., Barth, Albert D..

Subjects/Keywords: radioimmunoassay of testosterone; breeding soundness examination; semen evaluation

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

APA (6^th Edition):

Helbig, L. (2005). Onset of puberty and seasonal fertility in bison bulls. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04252005-122338

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Helbig, Larissa. “Onset of puberty and seasonal fertility in bison bulls.” 2005. Thesis, University of Saskatchewan. Accessed January 17, 2021. http://hdl.handle.net/10388/etd-04252005-122338.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Helbig, Larissa. “Onset of puberty and seasonal fertility in bison bulls.” 2005. Web. 17 Jan 2021.

Vancouver:

Helbig L. Onset of puberty and seasonal fertility in bison bulls. [Internet] [Thesis]. University of Saskatchewan; 2005. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10388/etd-04252005-122338.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Helbig L. Onset of puberty and seasonal fertility in bison bulls. [Thesis]. University of Saskatchewan; 2005. Available from: http://hdl.handle.net/10388/etd-04252005-122338

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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