subject:(heifers)

Oregon State University

1. Schubach, Kelsey M. Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers.

Degree: MS, Animal Science, 2016, Oregon State University

URL: http://hdl.handle.net/1957/59743

► The following experiment presented herein compared growth, physical activity, stress-related responses, and puberty attainment in heifers reared on high- (HIDENS) or low-stocking densities (LOWDENS). Sixty… (more)

▼ The following experiment presented herein compared growth, physical activity, stress-related responses, and puberty attainment in heifers reared on high- (HIDENS) or low-stocking densities (LOWDENS). Sixty Angus x Hereford heifers were ranked by age and BW (210 ± 2 d and 220 ± 2 kg, respectively) on d 0, and assigned to: a) 1 of 3 drylot pens (10 × 14 m pens; 10 heifers/pen) resulting in a stocking density of 14 m²/heifer (HIDENS; n = 3), or b) 1 of 3 pastures (25-ha pastures; 10 heifers/pasture), resulting in a stocking density of 25,000 m²/heifer (LOWDENS; n = 3). Pastures utilized herein were harvested for hay prior to the beginning of this experiment, and negligible forage was available for grazing to LOWDENS heifers throughout the experimental period (d 0 to 182). Heifers received the same limit-fed diet during the experiment, which averaged (DM basis) 4.0 kg/heifer daily of alfalfa-grass hay and 3.0 kg/heifer daily of a corn-based concentrate. Heifer shrunk BW was recorded after 16 h of feed and water withdrawal on d -3 and d 183 for ADG calculation. On d 0, heifers were fitted with a pedometer fixed behind their right shoulder. Each week during the experiment, pedometer results were recorded and blood samples were collected for puberty evaluation via plasma progesterone. Plasma samples collected on d 0, 28, 56, 84, 112, 140, 161, and 182 were also analyzed for concentrations of cortisol and IGF-I. On d 28, 102, and 175, blood samples were also collected for RNA isolation and analysis of heat shock protein (HSP) 70 and HSP72 mRNA expression. On d 0, 49, 98, 147, and 182, hair samples were collected from the tail switch for analysis of hair cortisol concentrations. No treatment effects were detected (P = 0.66) for heifer BW or ADG. Heifers from LOWDENS had more (P < 0.01) steps/week compared with HIDENS. Heifers from LOWDENS had greater (P = 0.05) mRNA expression of HSP72, and tended (P = 0.10) to have greater mRNA expression of HSP70 compared with HIDENS. Plasma concentrations of cortisol and IGF-I were often greater (P ≤ 0.05) in LOWDENS vs. HIDENS heifers (treatment × day interaction; P < 0.01). Hair cortisol concentrations were greater (P < 0.01) for HIDENS vs. LOWDENS heifers beginning on d 98 (treatment × day interaction; P < 0.01). Heifers from HIDENS experienced delayed puberty attainment and had a lower (P < 0.01) proportion of pubertal heifers on d 182 compared with LOWDENS (treatment × day interaction; P < 0.01). In summary, HIDENS negatively impacted heifer stress-related and physiological responses, and delayed puberty attainment compared with LOWDENS. Advisors/Committee Members: Cooke, Reinaldo (advisor), Bohnert, David (committee member).

Subjects/Keywords: beef heifers; Heifers – Development

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APA (6^th Edition):

Schubach, K. M. (2016). Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59743

Chicago Manual of Style (16^th Edition):

Schubach, Kelsey M. “Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers.” 2016. Masters Thesis, Oregon State University. Accessed April 12, 2021. http://hdl.handle.net/1957/59743.

MLA Handbook (7^th Edition):

Schubach, Kelsey M. “Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers.” 2016. Web. 12 Apr 2021.

Vancouver:

Schubach KM. Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/1957/59743.

Council of Science Editors:

Schubach KM. Impacts of Stocking Density on Development and Puberty Attainment of Replacement Beef Heifers. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59743

University of Sydney

2. Williams, Karen. Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers .

Degree: 2014, University of Sydney

URL: http://hdl.handle.net/2123/13345

► Several studies were undertaken to investigate the shedding and super-shedding (>104 cfu/g faeces) of Escherichia coli O157 by dairy heifers. E. coli O157 was detected… (more)

▼ Several studies were undertaken to investigate the shedding and super-shedding (>104 cfu/g faeces) of Escherichia coli O157 by dairy heifers. E. coli O157 was detected from replacement heifers being raised and these heifers were monitored in longitudinal studies. These studies identified a vast range of the prevalence of shedding within the cohort over time (9.6 ¬– 94.3% during the longitudinal study) and a vast range in the levels of E. coli O157 shed by heifers. No patterns or trends could be identified in shedding at the herd level with no discernable associations between shedding levels beyond one week. The absence of patterns and associations in herd level shedding was further demonstrated by intensive, daily sampling periods, which also demonstrated the short duration of shedding and the variability within individuals. The level of shedding by individual heifers, specifically super-shedding, showed little association to herd level shedding. Super-shedding from individual heifers was sporadic with a large number of heifers (nearly half in the longitudinal study) identified as super-shedding at some point. This suggests that the identification of these ‘high risk’ animals and removal may not provide a practical solution to control E. coli O157 from cattle. Further analysis of these studies was undertaken to identify factors which may affect shedding at the herd level. Analysis showed a link between animal factors and shedding or super shedding; body score was associated with shedding and faecal consistency and hide cleanliness was associated with super-shedding. Warm and moist climate conditions were shown to be associated with higher levels of shedding and super-shedding which is expected to provide optimal conditions for bacterial growth and survival. These associations were also shown to be short term. The largest effects were associated with rainfall and these effects also lasted over the longest duration, which is likely associated with increased moisture in the environment following rainfall events and especially high rainfall events. Pasture growth was also associated with shedding, but the confounding effects of warm and wet conditions on pasture growth must be considered. The associations between many of these factors are difficult to disentangle: there are likely to be links between climate and pasture growth, pasture growth and faecal consistency, and faecal consistency and hide cleanliness. Which of these factors, or the compounded effects, actually affect E. coli O157 shedding is difficult to identify in field, observational studies. Pulsed field gel electrophoresis of isolates recovered from these heifers identified two very similar Xba1 pulsotypes with a change in the predominant type over time. This may indicate a single genetic event propagating in the population. However, the use of a second enzyme (Bln1) identified some differences between pulsotypes which were indistinguishable by Xba1 indicating the limitations of the method. Isolates recovered from cattle were also shown to be similar to…

Subjects/Keywords: Shedding; Heifers; Dairy

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APA (6^th Edition):

Williams, K. (2014). Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/13345

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):

Williams, Karen. “Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers .” 2014. Thesis, University of Sydney. Accessed April 12, 2021. http://hdl.handle.net/2123/13345.

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

MLA Handbook (7^th Edition):

Williams, Karen. “Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers .” 2014. Web. 12 Apr 2021.

Vancouver:

Williams K. Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers . [Internet] [Thesis]. University of Sydney; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/2123/13345.

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

Council of Science Editors:

Williams K. Investigations of faecal shedding and super-shedding of Escherichia coli 0157 by dairy heifers . [Thesis]. University of Sydney; 2014. Available from: http://hdl.handle.net/2123/13345

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

Stellenbosch University

3. Engelbrecht, Michiel Nicolaas. The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers.

Degree: MSc, Animal Sciences, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/97998

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ENGLISH ABSTRACT: Sixty Bonsmara heifers (328 ± 3.9 kg) on planted pastures were used to evaluate the effect of two energy sources and three growth… (more)

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ENGLISH ABSTRACT: Sixty Bonsmara heifers (328 ± 3.9 kg) on planted pastures were used to evaluate the effect of two energy sources and three growth promoters on body weight gain. Two supplementary feeds with dried apple pulp (A) or maize (M) as main energy source were formulated on an iso-nutrient base. One of three different growth promoters was included in each energy supplement: placebo (no growth promoter, designated as Treatments Ap and Mp), ionofore (monensin, designated as Treatments Am and Mm) and essential oil extract (from oregano, designated as Treatments Ao and Mo). A fixed amount of the supplements was offered to the six treatment groups in a growth/finishing study on cultivated grass-legume pastures. Animals were stratified according to initial weight in ten blocks and treatments were assigned randomly to animals in each block. The 66 day growth study was conducted during spring (Sepember to November, 2014) in the Western Cape Province of South Africa near Greyton. The cultivated pastures consisted of a perennial grass-legume mixture. A rotation grazing system was applied and animals were moved to new paddocks once a week. Based on falling plate meter readings, the heifers consumed a calculated mean amount of 4.48 ± 0.08 (SEM) kg DM/day over the entire experimental period. A fixed amount of 4 kg (“as is” basis) of the respective supplements were offered daily during the first 42 days, followed by 5 kg/day from 43 days until the end of the study (66 days). Animals were weighed bi-weekly and average daily gain (ADG) was calculated. The mean ADG of the six treatment groups was 1.44 kg/day. No interactions occurred between the energy sources and growth promoters used in the concentrates and main effects were thus interpreted. The supplements that contained apple pulp as energy source resulted in a higher (P < 0.02) ADG (1.54 kg/day) than the maize containing supplements (1.33 kg/day). There were no differences between any of the growth promoters, with the placebo resulting in similar growth rates than monensin and oregano oil extract. Mean ADG values (kg/day) of the different growth promoter treatments were 1.44 (placebo), 1.49 (monensin) and 1.38 (oregano). All the heifers were slaughtered at the end of the trial. Carcass weight and dressing percentage did not differ between energy sources or growth promoters. The mean dressing percentage was 52.5%. The mean income over feeding cost for the 66 day period of the three maize energy source treatments was R254.20/heifer, while that of the apple pulp treatments was R524.75/heifer. According to this study, concentrate supplements containing apple pulp as main energy source were economically more desirable than those containing maize as primary energy source.

AFRIKAANSE OPSOMMING: Sestig Bonsmaraverse (328 ± 3.9 kg) op aangeplante weiding is gebruik om die invloed van twee energiebronne en drie groeibevorderaars op massatoename te ondersoek. Twee supplemente met gedroogde appelpulp (A) of mielies (M) as hoofenergiebron is op ‘n isonutriëntbasis geformuleer.…

Advisors/Committee Members: Cruywagen, C. W., Hoffman, L. C., Hoffmann, W. H., Stellenbosch University. Faculty of Agrisciences. Dept. of Animal Sciences..

Subjects/Keywords: Heifers – Feeding and feeds; Heifers – Growth; Heifers – Nutrition; UCTD

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APA (6^th Edition):

Engelbrecht, M. N. (2015). The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/97998

Chicago Manual of Style (16^th Edition):

Engelbrecht, Michiel Nicolaas. “The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers.” 2015. Masters Thesis, Stellenbosch University. Accessed April 12, 2021. http://hdl.handle.net/10019.1/97998.

MLA Handbook (7^th Edition):

Engelbrecht, Michiel Nicolaas. “The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers.” 2015. Web. 12 Apr 2021.

Vancouver:

Engelbrecht MN. The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers. [Internet] [Masters thesis]. Stellenbosch University; 2015. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10019.1/97998.

Council of Science Editors:

Engelbrecht MN. The effect of supplements containing different protein and energy sources and essential oils on the performance of pasture finished heifers. [Masters Thesis]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/97998

Universiteit Utrecht

4. Bardie, Tilly. Vitamine E in het bloed en in de lever bij vaarzen.

Degree: 2008, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/27215

► The effect of supplementation of 3000 IU vitamin E on the concentration of vitamin E in blood and in the liver of heifers around parturition… (more)

Subjects/Keywords: Diergeneeskunde; vitamin E; heifers

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APA (6^th Edition):

Bardie, T. (2008). Vitamine E in het bloed en in de lever bij vaarzen. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/27215

Chicago Manual of Style (16^th Edition):

Bardie, Tilly. “Vitamine E in het bloed en in de lever bij vaarzen.” 2008. Doctoral Dissertation, Universiteit Utrecht. Accessed April 12, 2021. http://dspace.library.uu.nl:8080/handle/1874/27215.

MLA Handbook (7^th Edition):

Bardie, Tilly. “Vitamine E in het bloed en in de lever bij vaarzen.” 2008. Web. 12 Apr 2021.

Vancouver:

Bardie T. Vitamine E in het bloed en in de lever bij vaarzen. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2008. [cited 2021 Apr 12]. Available from: http://dspace.library.uu.nl:8080/handle/1874/27215.

Council of Science Editors:

Bardie T. Vitamine E in het bloed en in de lever bij vaarzen. [Doctoral Dissertation]. Universiteit Utrecht; 2008. Available from: http://dspace.library.uu.nl:8080/handle/1874/27215

Mississippi State University

5. Phiri, Diniwe Grace. Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L).

Degree: MS, Animal and Dairy Sciences, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03242016-095258/ ;

► This study was conducted to measure the intake; nutritive value and digestibility of peanut hay (Arachis hypogaea L.). Fourteen Holstein heifers (BW= 408 plus/minus… (more)

Subjects/Keywords: dairy heifers; peanut hay

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APA (6^th Edition):

Phiri, D. G. (2016). Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L). (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03242016-095258/ ;

Chicago Manual of Style (16^th Edition):

Phiri, Diniwe Grace. “Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L).” 2016. Masters Thesis, Mississippi State University. Accessed April 12, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03242016-095258/ ;.

MLA Handbook (7^th Edition):

Phiri, Diniwe Grace. “Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L).” 2016. Web. 12 Apr 2021.

Vancouver:

Phiri DG. Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L). [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Apr 12]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03242016-095258/ ;.

Council of Science Editors:

Phiri DG. Intake, nutritive value and digestibility in Holstein heifers fed diets supplemented with peanut hay (Arachis Hypogeal L). [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03242016-095258/ ;

Univerzitet u Beogradu

6. Savić, Đorđe B., 1980-. Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase.

Degree: Fakultet veterinarske medicine, 2014, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:6653/bdef:Content/get

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Morfologija i fiziologija životinja - Fiziologija i metabolizam visokomliječnih krava / Animal morphology and physiology - Physiology and metabolism of dairy cows

Cilj ove doktorske… (more)

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Morfologija i fiziologija životinja - Fiziologija i metabolizam visokomliječnih krava / Animal morphology and physiology - Physiology and metabolism of dairy cows

Cilj ove doktorske disertacije bio je da se ispita uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase u kasnom graviditetu i ranoj laktaciji. Ispitivanje je sprovedeno na ukupno 30 junica holštajn rase, odabranih u visokom graviditetu. Obje grupe junica su hranjene obrokom prilagođenim potrebama za graviditet, odnosno laktaciju. Junice ogledne grupe su u cilju indukcije hipotireoze od 20. dana prije očekivanog teljenja do dana teljenja svakodnevno peroralno tretirane sa 4 mg PTU/kg tjelesne mase, pomiješanog sa 25 ml maltoznog sirupa. Junice kontrolne grupe su svakodnevno primale samo 25 ml maltoznog sirupa. Uzorci krvi uzeti su punkcijom v. jugularis 20 dana prije očekivanog termina teljenja, 3 i 7 dana kasnije, svakodnevno tokom pet dana prije i pet dana nakon teljenja, a zatim 7., 15., 30. i 60. dana nakon teljenja. Uzorci tkiva jetre uzeti su od svih junica perkutanom biopsijom 7. dana prije očekivanog teljenja i 7. dana nakon teljenja. U svim uzetim uzorcima krvi određene su koncentracije T4, T3, insulina i glukoze. Na osnovu koncentracije insulina i glukoze izračunata je vrijednost HOMA indeksa za sve periode uzorkovanja. U uzorcima uzetim 20., 17., 13., 7. i 4. dana prije i 7., 30. i 60. dana nakon teljenja određena je koncentracija IGF-I, a u uzorcima uzetim 20. i 7. dana prije i 7. i 30. dana nakon teljenja relativna zastupljenost IGFBP-2, IGFBP-3 i IGFBP-4. U uzorcima uzetim 20., 17., 13., 7., 4. i 1. dana prije, i 1., 3., 5., 7., 15., 30. i 60. dana nakon teljenja određene su koncentracije BHBA i ukupnog bilirubina. U uzorcima uzetim 20., 17., 13., 7. i 4. dana prije, na dan teljenja, kao i 3., 4., 7., 15., 30. i 60. dana nakon teljenja određene su koncentracije ukupnih proteina i albumina. U uzetim uzorcima tkiva jetre određena je aktivnost dejodinaza, stepen zamašćenja jetre i sadržaj glikogena. Dnevna proizvodnja mlijeka praćena je u periodu od 7. do 60. dana laktacije, a trajanje servis perioda je izračunato na osnovu podataka sa farme. Tokom tretmana sa PTU kod junica ogledne grupe ustanovljeno je statistički značajno opadanje koncentracije T4, T3, BHBA i aktivnosti DIO1 u tkivu jetre, te statistički značajan porast koncentracije insulina, IGF-I i glukoze u odnosu na junice kontrolne grupe...

Advisors/Committee Members: Kirovski, Danijela, 1969-.

Subjects/Keywords: heifers; hypothyroidism; hormones; metabolites

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APA (6^th Edition):

Savić, Đorđe B., 1. (2014). Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:6653/bdef:Content/get

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):

Savić, Đorđe B., 1980-. “Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase.” 2014. Thesis, Univerzitet u Beogradu. Accessed April 12, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:6653/bdef:Content/get.

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

MLA Handbook (7^th Edition):

Savić, Đorđe B., 1980-. “Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase.” 2014. Web. 12 Apr 2021.

Vancouver:

Savić, Đorđe B. 1. Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase. [Internet] [Thesis]. Univerzitet u Beogradu; 2014. [cited 2021 Apr 12]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6653/bdef:Content/get.

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

Council of Science Editors:

Savić, Đorđe B. 1. Uticaj prepartalne aplikacije propiltiouracila na endokrini i metabolički status junica holštajn rase. [Thesis]. Univerzitet u Beogradu; 2014. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6653/bdef:Content/get

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

University of Florida

7. Bertelli Canal, Luara. The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers.

Degree: MS, Animal Sciences, 2018, University of Florida

URL: https://ufdc.ufl.edu/UFE0054124

► The objective of our study was to investigate the relationship between feed efficiency and fertility in growing heifers. One hundred and seventy-nine replacement beef heifers… (more)

Subjects/Keywords: beef – feedefficiency – fertility – heifers

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APA (6^th Edition):

Bertelli Canal, L. (2018). The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0054124

Chicago Manual of Style (16^th Edition):

Bertelli Canal, Luara. “The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers.” 2018. Masters Thesis, University of Florida. Accessed April 12, 2021. https://ufdc.ufl.edu/UFE0054124.

MLA Handbook (7^th Edition):

Bertelli Canal, Luara. “The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers.” 2018. Web. 12 Apr 2021.

Vancouver:

Bertelli Canal L. The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers. [Internet] [Masters thesis]. University of Florida; 2018. [cited 2021 Apr 12]. Available from: https://ufdc.ufl.edu/UFE0054124.

Council of Science Editors:

Bertelli Canal L. The Relationship between Feed Efficiency and Fertility in Replacement Beef Heifers. [Masters Thesis]. University of Florida; 2018. Available from: https://ufdc.ufl.edu/UFE0054124

University of Georgia

8. Talton, Clayton Seaborne. Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/23747

► Forty-eight heifers, of predominantly British breeding, were used to investigate the effects of Ractopamine (RAC) supplementation and ovariectomization (OVX) on feedlot performance, carcass yield and… (more)

Subjects/Keywords: Ractopamine; Ovariectomy; Heifers; Value Cuts

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APA (6^th Edition):

Talton, C. S. (2014). Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/23747

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):

Talton, Clayton Seaborne. “Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers.” 2014. Thesis, University of Georgia. Accessed April 12, 2021. http://hdl.handle.net/10724/23747.

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

MLA Handbook (7^th Edition):

Talton, Clayton Seaborne. “Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers.” 2014. Web. 12 Apr 2021.

Vancouver:

Talton CS. Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10724/23747.

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

Council of Science Editors:

Talton CS. Effects of Optaflexx feeding on animal performance, carcass traits, yields of carcass primals and value cuts, and meat tenderness in ovariectomized heifers. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/23747

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

The Ohio State University

9. Hutchings, Ronald P. The influence of excessive fat prior to weaning on the milking potential of beef heifers.

Degree: PhD, Graduate School, 1972, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486733043936105

Subjects/Keywords: Agriculture; Heifers

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APA (6^th Edition):

Hutchings, R. P. (1972). The influence of excessive fat prior to weaning on the milking potential of beef heifers. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486733043936105

Chicago Manual of Style (16^th Edition):

Hutchings, Ronald P. “The influence of excessive fat prior to weaning on the milking potential of beef heifers.” 1972. Doctoral Dissertation, The Ohio State University. Accessed April 12, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486733043936105.

MLA Handbook (7^th Edition):

Hutchings, Ronald P. “The influence of excessive fat prior to weaning on the milking potential of beef heifers.” 1972. Web. 12 Apr 2021.

Vancouver:

Hutchings RP. The influence of excessive fat prior to weaning on the milking potential of beef heifers. [Internet] [Doctoral dissertation]. The Ohio State University; 1972. [cited 2021 Apr 12]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486733043936105.

Council of Science Editors:

Hutchings RP. The influence of excessive fat prior to weaning on the milking potential of beef heifers. [Doctoral Dissertation]. The Ohio State University; 1972. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486733043936105

Montana State University

10. Whitehurst, William Ashley III. Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers.

Degree: MS, College of Agriculture, 2012, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/2533

► Objectives of this experiment were to compare rate and efficiency of gain, and conception rates of yearling heifers supplemented with Cu, Zn and Mn as… (more)

▼ Objectives of this experiment were to compare rate and efficiency of gain, and conception rates of yearling heifers supplemented with Cu, Zn and Mn as either methionine chelated trace mineral (CTM) or the same minerals in SO 4 form. The experimental design utilized 3 ranches, each having 2 replications per treatment with pen as the experimental unit for ADG, DMI and G:F. Heifer was the experimental unit for pregnancy rates. Ranch 1 contained 498 Angus heifers, ranch 2, 236 Red Angus cross heifers, and ranch 3, 1,742 Angus cross heifers. All heifers were fed silage based diets that contained approximately 13.5% CP, 64% TDN (DM basis) and had low levels of SO 4, Mo or Fe in feed or H 2O. Diets contained 24 ppm Cu, 70 ppm Zn and 64 ppm Mn. Supplements were fed for 181 d (Ranch 1), 149 d (Ranch 2) and 151 d (Ranch 3) prior to breeding. Heifers were weighed at trial initiation (BW 270 kg ± 2.8), end of drylot feeding, at breeding and at pregnancy diagnosis. Ranch 1 heifers were bred by AI followed by natural service (45 d breeding), Ranch 2 heifers were bred by natural service (50 d breeding) and Ranch 3 heifers were bred by AI once. Pregnancy was determined via ultrasound. Ranch effects were significant (P < 0.001) for gain, ADG, G:F and overall pregnancy rate, but not for conception in the first 21 d. No ranch x treatment interactions were detected for any measurements (P e 0.47) and no differences (P e 0.46) were detected between treatments for total gain, ADG, G:F or the number of heifers that conceived during the first 21 d on Ranches 1 or 2. Conception rate increased (P = 0.03) for CTM heifers from ranch 3 with one AI breeding. Across ranches, conception rates during the first 21 d of breeding did not differ (P = 0.12) between treatments but overall pregnancy rate was greater (P = 0.05) for heifers supplemented with CTM. Under the conditions of this experiment results suggest that supplementation with CTM contributed to greater pregnancy rates in heifers. Advisors/Committee Members: Chairperson, Graduate Committee: John Paterson. (advisor).

Subjects/Keywords: Heifers; Trace elements; Growth; Reproduction

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APA (6^th Edition):

Whitehurst, W. A. I. (2012). Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/2533

Chicago Manual of Style (16^th Edition):

Whitehurst, William Ashley III. “Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers.” 2012. Masters Thesis, Montana State University. Accessed April 12, 2021. https://scholarworks.montana.edu/xmlui/handle/1/2533.

MLA Handbook (7^th Edition):

Whitehurst, William Ashley III. “Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers.” 2012. Web. 12 Apr 2021.

Vancouver:

Whitehurst WAI. Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers. [Internet] [Masters thesis]. Montana State University; 2012. [cited 2021 Apr 12]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/2533.

Council of Science Editors:

Whitehurst WAI. Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers. [Masters Thesis]. Montana State University; 2012. Available from: https://scholarworks.montana.edu/xmlui/handle/1/2533

Montana State University

11. Spence, Kaitlyn Claire. The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers.

Degree: MS, College of Agriculture, 2014, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/8709

► The objectives of these studies were to investigate the effects of feeding high-linoleic cracked safflower seeds on reproductive and performance outcomes in pubertal beef heifers.… (more)

▼ The objectives of these studies were to investigate the effects of feeding high-linoleic cracked safflower seeds on reproductive and performance outcomes in pubertal beef heifers. Three experiments were conducted at Montana State University research facilities (Exp. 1, n = 48, BW = 370 ± 24.8 kg; Exp. 2, n = 40, BW = 396.5 ± 31.7 kg; Exp. 3, n = 63, BW = 404.4 ± 26.14 kg). Angus and Angus crossbred heifers were stratified by BW and allocated randomly to the following experimental treatments; 1) fed 1.8 kg/d barley grain concentrate (Barley); or, 2) fed 1.8 kg/d of high linoleic cracked safflower seed (Safflower). Heifers were fed 35 and 29 d, Exp. 1, Exp. 2 and 3. Following the feeding period, heifers (Exp. 1 and 2) were artificially inseminated (AI) 12 h after the onset of estrus, and heifers that did not show estrus were administered 25 mg of PGF 2 alpha and time AI. A 7-d CO-synch + CIDR and TAI protocol was used for heifers in Exp. 3. Performance variables included initial and final BW, live wt gain, ADG, and DMI (Exp. 1 and 2). Biweekly blood samples were assayed for progesterone (P4) and PGF 2 alpha metabolites (PGFM) concentrations (Exp. 1). Estrus responses were observed using Estrotect tags, heifers with progesterone (P4) < 1 ng/mL were not included in the calculation. Pregnancy rates were determined 40 d post breeding. Performance variables did not differ between barley and safflower treatments with the exception of DMI in Exp. 2. Heifers supplemented with barley consumed 21% more (P < 0.001) DM per d than heifer fed safflower. In Exp. 1, overall pregnancy rates were greater in safflower supplemented heifers than in barley supplemented heifers (P = 0.036). Pooled PGFM concentrations differed by day (P < 0.05) in Exp. 1. Results suggest supplemental high linoleic safflower seed does not appear to influence estrus response or PGFM concentrations in pubertal beef heifers. Advisors/Committee Members: Co-chairs, Graduate Committee: Glenn Duff and Janice G. P. Bowman (advisor).

Subjects/Keywords: Heifers; Feeds; Estrus; Safflower

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APA (6^th Edition):

Spence, K. C. (2014). The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/8709

Chicago Manual of Style (16^th Edition):

Spence, Kaitlyn Claire. “The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers.” 2014. Masters Thesis, Montana State University. Accessed April 12, 2021. https://scholarworks.montana.edu/xmlui/handle/1/8709.

MLA Handbook (7^th Edition):

Spence, Kaitlyn Claire. “The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers.” 2014. Web. 12 Apr 2021.

Vancouver:

Spence KC. The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers. [Internet] [Masters thesis]. Montana State University; 2014. [cited 2021 Apr 12]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/8709.

Council of Science Editors:

Spence KC. The effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifers. [Masters Thesis]. Montana State University; 2014. Available from: https://scholarworks.montana.edu/xmlui/handle/1/8709

12. Stahl, Tess Catherine. SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.

Degree: MS, 2019, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1333

► Much of the research on sodium butyrate (SB) has been conducted with pre-ruminant calves. Previous research with post-weaned calves was shown to be beneficial.… (more)

▼ Much of the research on sodium butyrate (SB) has been conducted with pre-ruminant calves. Previous research with post-weaned calves was shown to be beneficial. The objective of this study was to compare sodium butyrate to monensin (MON) on the growth, digestibility, and health of post-weaned heifers. Forty Holstein dairy heifers with a mean age of 84.2 d ± 1.2 d (mean ± SD) and average body weight (BW) of 99.78 kg ± 10.77 (mean ± SD) were housed in a naturally ventilated freestall barn. Heifers were blocked by birth date and randomly assigned to 1 of 4 treatments in a completely randomized block design: (1) 100 g of soybean meal carrier (control; CON); (2) 0.75 g SB/kg of BW + carrier; (3) 1 mg monensin/kg of BW + carrier; (4) monensin + 0.75 g SB per kg of BW (MSB). Data were statistically analyzed using single degree of freedom contrasts evaluating CON vs. all other treatments; SB vs. MON; and SB and MON vs. MSB. Treatments were top-dressed and hand-mixed into a total mixed ration (TMR) once daily. Heifers had free access to water. Amount of orts and feed offered to each heifer was measured daily. Feed and orts samples were frozen at -20°C for future analysis. Orts samples were taken daily and subsampled for later DM determination, while TMR samples were taken weekly and composited monthly for later DM and nutrient analysis. Initial BW, heart girth, paunch girth, and body length were measured before the start of the study and every week thereafter during the 12 wk trial (168 d old). Blood samples were obtained, and glucose and ketone concentrations were determined prior to the start of treatment and weekly until the conclusion of the study. Fecal grab samples were taken prior to treatment and every week from each heifer for coccidia counts. Apparent total-tract nutrient digestibility samples were taken in two different phases: 21 d on study until 27 d, and again at 63 d until 69 d. Apparent total tract nutrient digestibility was taken during this time and determined through acid-insoluble ash. Additives had a positive effect, tending to increase average BW and final BW. Any additive tended to increase heart girth, while MSB tended to be greater than either SB and MON. No other effects were seen on skeletal growth. Daily dry matter intakes (DMI) were increased in the diets containing additives as compared to control. Dry matter intake values were 4.00, 4.47, 4.16, and 4.46 kg/d for CON, SB, MON, and MSB, respectively. Feed efficiency (FE) was improved in MON supplemented heifers as compared to SB. Fecal samples from each heifer indicated the presence of coccidia. Compared to control, additives decreased the number of coccidian oocysts present in feces. Monensin and SB treatments tended to have greater plasma glucose as compared to MSB. Average blood ketone concentrations were greater with any additive compared to CON, in SB vs. MON, and in MSB as compared to SB and MON. During the week 3 digestibility period, DMI tended to be greater in heifers fed SB when compared to MON, as well as heifers fed MSB when compared… Advisors/Committee Members: Peter S. Erickson, Andre F Brito, Kayla M Aragona.

Subjects/Keywords: Dairy heifers; Dairy science; Heifers; Holstein; Monensin; Sodium butyrate

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APA (6^th Edition):

Stahl, T. C. (2019). SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1333

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):

Stahl, Tess Catherine. “SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.” 2019. Thesis, University of New Hampshire. Accessed April 12, 2021. https://scholars.unh.edu/thesis/1333.

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

MLA Handbook (7^th Edition):

Stahl, Tess Catherine. “SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.” 2019. Web. 12 Apr 2021.

Vancouver:

Stahl TC. SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. [Internet] [Thesis]. University of New Hampshire; 2019. [cited 2021 Apr 12]. Available from: https://scholars.unh.edu/thesis/1333.

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

Council of Science Editors:

Stahl TC. SODIUM BUTYRATE AND MONENSIN SUPPLEMENTATION TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. [Thesis]. University of New Hampshire; 2019. Available from: https://scholars.unh.edu/thesis/1333

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

Universiteit Utrecht

13. Bertens, M.F. Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows.

Degree: 2008, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/178945

► The aim of this study was to compare embryo quality, uterine environment and corpus luteum function in heifers and second/third parity cows. After superovulation and… (more)

Subjects/Keywords: Diergeneeskunde; corpus luteum, embryo quality, heifers

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APA (6^th Edition):

Bertens, M. F. (2008). Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/178945

Chicago Manual of Style (16^th Edition):

Bertens, M F. “Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows.” 2008. Doctoral Dissertation, Universiteit Utrecht. Accessed April 12, 2021. http://dspace.library.uu.nl:8080/handle/1874/178945.

MLA Handbook (7^th Edition):

Bertens, M F. “Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows.” 2008. Web. 12 Apr 2021.

Vancouver:

Bertens MF. Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2008. [cited 2021 Apr 12]. Available from: http://dspace.library.uu.nl:8080/handle/1874/178945.

Council of Science Editors:

Bertens MF. Comparison of corpus luteum function and embryo quality in heifers and second/third parity lactating cows. [Doctoral Dissertation]. Universiteit Utrecht; 2008. Available from: http://dspace.library.uu.nl:8080/handle/1874/178945

Mississippi State University

14. Graves, Jessica Martin. PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER.

Degree: MS, Animal and Dairy Sciences, 2010, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11122010-115734/ ;

► Objectives of the present study were to evaluate neonatal Holstein heifer performance while supplemented with coccidiostat (CX), yeast (YST), β-glucan or some combination of… (more)

Subjects/Keywords: mannanoligosaccharide; heifers; coccidostat

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APA (6^th Edition):

Graves, J. M. (2010). PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11122010-115734/ ;

Chicago Manual of Style (16^th Edition):

Graves, Jessica Martin. “PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER.” 2010. Masters Thesis, Mississippi State University. Accessed April 12, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11122010-115734/ ;.

MLA Handbook (7^th Edition):

Graves, Jessica Martin. “PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER.” 2010. Web. 12 Apr 2021.

Vancouver:

Graves JM. PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER. [Internet] [Masters thesis]. Mississippi State University; 2010. [cited 2021 Apr 12]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11122010-115734/ ;.

Council of Science Editors:

Graves JM. PERFORMANCE OF NEONATAL HOLSTEIN HEIFERS FED YEAST DERIVATIVES IN MILK REPLACER. [Masters Thesis]. Mississippi State University; 2010. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11122010-115734/ ;

Oregon State University

15. De Meireles Reis, Maria. Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters.

Degree: MS, Animal Science, 2014, Oregon State University

URL: http://hdl.handle.net/1957/54611

► The following experiment presented herein compared growth, physiological, and reproductive responses of beef heifers with (MI) or without (CON) access to a creep-feeder, as a… (more)

▼ The following experiment presented herein compared growth, physiological, and reproductive responses of beef heifers with (MI) or without (CON) access to a creep-feeder, as a manner to stimulate metabolic imprinting while nursing their dams. On d 0 of the experiment, 60 Angus × Hereford heifers were ranked by initial BW and age (140 ± 3 kg and 68 ± 3 d, respectively) as well as dam age and BCS, and assigned to pairs so all ranking criteria were similar between heifers within each pair. On d 1, pairs were randomly assigned to MI (n = 15) or CON (n = 15). From d 1 to 51, MI pairs and their dams were allocated to 15 drylot pens where heifers had ad libitum access to a corn-based supplement through a creep-feeder. The CON pairs and their dams were maintained in an adjacent single drylot pen. From d 52 to 111, cattle from both treatments were managed as a single group on a semiarid range pasture. On d 111, heifers were weaned and allocated to 2 pastures according to treatment, receiving hay and a corn-based concentrate until d 326. Full BW was recorded prior to (d -1 and 0) and at the end of the creep-feeding period (d 50 and 51), whereas shrunk BW was collected on d 112 and 326. On d 0, 51, 111, 187, 261, and 325, blood was collected and real-time ultrasonography for LM depth and backfat thickness assessment was performed. Blood was also collected every 10 d from d 113 to 323 for puberty evaluation via plasma progesterone concentrations. Liver and subcutaneous fat biopsies were performed on d 51, 111, 261, and 325. Average daily gain was greater (P < 0.01) for MI than CON from d 1 to 51, tended (P = 0.09) to be greater for CON than MI from d 112 to 326, whereas BW on d 326 was similar (P = 0.87) between treatments. On d 51, MI had greater (P ≤ 0.01) plasma IGF-I and glucose concentrations, as well as mRNA expression of hepatic pyruvate carboxylase and adipose fatty acid synthase than CON. On d 261 and 325, plasma insulin concentrations were greater (P ≤ 0.03) in CON than MI. Mean mRNA expression of hepatic IGF-I and adipose peroxisome proliferator-activated receptor gamma were greater (P ≤ 0.05) in MI than CON. Heifers assigned to MI attained puberty earlier (P = 0.04) during the experiment than CON, although age and BW at puberty were similar (P ≤ 0.74) between treatments. In conclusion, supplementing nursing heifers via creep-feeding for 50 d altered physiological and biochemical parameters suggestive of a metabolic imprinting effect, but did not impact heifer age or BW at puberty. Advisors/Committee Members: Cooke, Reinaldo (advisor), Bohnert, David (committee member).

Subjects/Keywords: beef heifer; Heifers – Feeding and feeds

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APA (6^th Edition):

De Meireles Reis, M. (2014). Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/54611

Chicago Manual of Style (16^th Edition):

De Meireles Reis, Maria. “Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters.” 2014. Masters Thesis, Oregon State University. Accessed April 12, 2021. http://hdl.handle.net/1957/54611.

MLA Handbook (7^th Edition):

De Meireles Reis, Maria. “Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters.” 2014. Web. 12 Apr 2021.

Vancouver:

De Meireles Reis M. Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters. [Internet] [Masters thesis]. Oregon State University; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/1957/54611.

Council of Science Editors:

De Meireles Reis M. Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters. [Masters Thesis]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/54611

Colorado State University

16. French, Jesse. Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI.

Degree: MS(M.S.), Animal Sciences, 2012, Colorado State University

URL: http://hdl.handle.net/10217/65341

► Three studies were conducted to evaluate the efficacy of a timed AI (TAI) estrous synchronization protocol that used a 14-d controlled internal drug release (CIDR)… (more)

▼ Three studies were conducted to evaluate the efficacy of a timed AI (TAI) estrous synchronization protocol that used a 14-d controlled internal drug release (CIDR) insert and a GnRH injection on d 9 to force ovulation of potentially persistent follicles and induce a second wave of follicle growth. In the first study 710 yearling heifers across 4 locations were assigned to 1 of 3 treatments: 1) 14-d GnRH-9 heifers (n = 242) received CIDR (1.38 g progesterone) and 100 μg GnRH on d 0, 100 μg GnRH on d 9, and 50 mg PGF2α on d 14 concurrent with CIDR removal, 2) 14-d 6 h PG heifers (n = 233) were identical to 14-d GnRH-9 except that on d 14, 2 25 mg injections of PGF2α were given 6 h apart, and 3) 5-d CO-Synch + CIDR heifers (n = 235) received 100 μg GnRH and CIDR on d 9 and a single 25 mg PGF2α at CIDR removal. All 3 treatments received 100 μg GnRH with TAI at 72 ± 2 h after CIDR removal. The 14-d GnRH-9 TAI pregnancy rate (54.5%) did not differ (P = 0.57) from the 14-d 6h PG TAI pregnancy rate (53.6%). The TAI pregnancy rate of 14-d protocols combined was 54.1%, and was not different (P = 0.20) from the 5-d CO-Synch + CIDR TAI pregnancy rate of 46.4%. The following year 319 yearling heifers across 4 locations were assigned to 1 of 3 treatments: 1) 14-d GnRH-9 (n = 107; as described earlier), 2) 14-d PG (n = 107) was identical to 14-d GnRH-9 except instead of receiving GnRH on d 0 they received 25 mg of PGF2α and, 3) 5-d CO-Synch + CIDR (n = 104; as described earlier). All treatments received 100 μg GnRH at TAI 72 ± 2 h after CIDR removal. Heifers' ovaries (n = 120) were ultrasounded at 2 locations on d 0, 9, 14, and 17 of the estrous synchronization protocol to determine ovarian structures and response. The 14-d GnRH-9 TAI pregnancy rate (52.3%) was not different (P = 0.82) than 14-d PG (47.6%), nor was the TAI pregnancy rate of both 14-d treatments combined (50.0%) different (P = 0.66) from 5-d CO-Synch + CIDR (47.1%). Based on ultrasonography, the 14-d GnRH-9 treatment induced a second wave of follicular growth in 25.9% of heifers while 14-d PG heifers had larger (P = 0.01) follicle size on d 9 but did not reduce (P > 0.10) corpora lutea at TAI compared to 14-d GnRH-9 or 5-d CO-Synch + CIDR. That same year 453 heifers at another location were assigned to 1 of 3 treatments: 1) 14-d GnRH-9 (n = 150; as described earlier), 2) 14-d GnRH-7 (n = 150) received 100 μg GnRH and CIDR on d 0, 100 μg GnRH on d 7, 25 mg PGF2α on d 14 at CIDR removal, and 100 μg GnRH at TAI 63 ± 3 h after CIDR removal, and 3) 7-d CO-Synch + CIDR received 100 μg GnRH and CIDR on d 7, 25 mg PGF2α at CIDR removal, and 100 μg GnRH at TAI 63 ± 3 h after CIDR removal. Pregnancy rate to TAI of 14-d GnRH-9 (51.3%) was not different (P = 0.75) than 14-d GnRH-7 treatment (48.0%), nor was the TAI pregnancy rate of both 14-d treatments (49.6%) different (P = 0.83) from 7-d CO-Synch + CIDR (48.6%). These data indicate that the 14-d CIDR estrous synchronization protocol with d 9 GnRH produces comparable pregnancy rates to TAI compared to the industry utilized… Advisors/Committee Members: Peel, Kraig (advisor), Holt, Timothy (committee member), Ahola, Jason (committee member), Whittier, Jack (committee member).

Subjects/Keywords: artificial insemination; heifers; follicular waves; estrous synchronization

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APA (6^th Edition):

French, J. (2012). Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/65341

Chicago Manual of Style (16^th Edition):

French, Jesse. “Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI.” 2012. Masters Thesis, Colorado State University. Accessed April 12, 2021. http://hdl.handle.net/10217/65341.

MLA Handbook (7^th Edition):

French, Jesse. “Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI.” 2012. Web. 12 Apr 2021.

Vancouver:

French J. Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10217/65341.

Council of Science Editors:

French J. Evaluation of pregnancy rates following timed AI in beef heifers after synchronization of follicular waves using a 14-d controlled internal drug release insert, and the lifetime productivity of beef heifers conceiving to, or sired by, AI. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/65341

Texas A&M University

17. Allen, Carolyn C. Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers.

Degree: MS, Physiology of Reproduction, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8522

► Developmental changes within the hypothalamus are necessary for maturation of the reproductive neuroendocrine axis. Recent reports have implicated several neuronal networks in this process, but… (more)

▼ Developmental changes within the hypothalamus are necessary for maturation of the reproductive neuroendocrine axis. Recent reports have implicated several neuronal networks in this process, but genes involved in their regulation have not been elucidated. Using a well-established model for nutritional induction of precocious puberty, objectives were to 1) use microarray technology to examine changes in gene expression within the arcuate nucleus (ARC) of the hypothalamus in pre-pubertal heifers fed high or low-concentrate diets, and 2) determine if high-concentrate diets are required for nutritional induction of precocious puberty. In Experiment 1, early-weaned, cross-bred heifers were fed either a high-forage/low-gain (HF/LG; 0.45 kg/d) or a highconcentrate/ high-gain (HC/HG; 0.91 kg/d) diet for 91 d. Analysis of microarray data indicated that 346 genes were differentially expressed (P < 0.05) between HC/HG and HF/LG heifers. Expression of three key metabolic genes [neuropeptide Y (NPY), agoutirelated protein (AGRP), and growth hormone receptor (GHR)] observed to be differentially expressed in the microarray analysis was investigated further by quantitative PCR. Real-time RT-PCR indicated that expression of NPY, AGRP and GHR was lower (P < 0.05) in HC/HG compared to HF/LG heifers. In contrast, concentrations of insulin (P < 0.05), IGF-1 (P < 0.002) and leptin (P = 0.1) were greater in HC/HG compared to HF/LG. For Experiment 2, 48 heifers were used in 2 replicates (24 heifers/replicate) in a 2 x 2 factorial design to examine the roles of diet type (HF vs HC) and rate of gain (LG, 0.45 kg/d vs HG, 0.91 kg/d) on age at puberty. Heifers were fed HC/HG, HC/LG, HF/HG or HF/LG (n = 12/group) for 14 wk, and then switched to a common growth diet (0.68 kg/d) until puberty. Heifers in both HG groups reached puberty at a younger age (54.5 ± 1.8 wk) than heifers in both LG groups (60.2 ± 1.9 wk; P < 0.04). A marked increase (P < 0.01) in serum concentrations of leptin occurred in HC/HG heifers between 24 and 30 wk of age. This increase in circulating leptin was not observed in other groups. Overall, results indicate that nutritional regulation of reproductive neuroendocrine development involves the control of NPY, AGRP and GHR expression. The abrupt increase noted for circulating leptin in heifers fed HC/HG diets, if timed and sustained appropriately, could represent an important temporal cue for activation of the neuroendocrine system and the onset of puberty. Advisors/Committee Members: Williams, Gary L. (advisor), Amstalden, Marcel (advisor), Burghardt, Robert C. (committee member), Tedeschi, Luis O. (committee member).

Subjects/Keywords: Puberty; Arcuate Nucleus; Heifers; Neuropeptide Y; Leptin

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APA (6^th Edition):

Allen, C. C. (2011). Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8522

Chicago Manual of Style (16^th Edition):

Allen, Carolyn C. “Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers.” 2011. Masters Thesis, Texas A&M University. Accessed April 12, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8522.

MLA Handbook (7^th Edition):

Allen, Carolyn C. “Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers.” 2011. Web. 12 Apr 2021.

Vancouver:

Allen CC. Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8522.

Council of Science Editors:

Allen CC. Influence of Nutrition during the Juvenile Period on Gene Expression Within the Hypothalamic Arcuate Nucleus and on Age at Puberty in Heifers. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8522

Angelo State University

18. Coley, Allison. Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers.

Degree: MS, Animal Science, 2012, Angelo State University

URL: http://hdl.handle.net/2346.1/25

► The objectives of this study were to evaluate the feeding a high energy supplementation and its effects on estrus and conception rates in Angus heifers.… (more)

Subjects/Keywords: Angus heifers; breeding; feed treatment; Estrus; Conception

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APA (6^th Edition):

Coley, A. (2012). Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers. (Masters Thesis). Angelo State University. Retrieved from http://hdl.handle.net/2346.1/25

Chicago Manual of Style (16^th Edition):

Coley, Allison. “Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers.” 2012. Masters Thesis, Angelo State University. Accessed April 12, 2021. http://hdl.handle.net/2346.1/25.

MLA Handbook (7^th Edition):

Coley, Allison. “Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers.” 2012. Web. 12 Apr 2021.

Vancouver:

Coley A. Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers. [Internet] [Masters thesis]. Angelo State University; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/2346.1/25.

Council of Science Editors:

Coley A. Effects of feeding high energy supplements pre and post breeding on estrus and conception of spring calving heifers. [Masters Thesis]. Angelo State University; 2012. Available from: http://hdl.handle.net/2346.1/25

University of Missouri – Columbia

19. Martin, Neal Timothy. Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows.

Degree: 2012, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/33151

► This experiment compared two long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time AI (FTAI) in postpartum beef cows. Cows assigned to the… (more)

▼ This experiment compared two long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time AI (FTAI) in postpartum beef cows. Cows assigned to the 14-19 d CIDR-PG protocol (n = 196) received CIDR inserts (1.38 g progesterone) from d 0 to 14 and PGF2[alpha] (PG; 25 mg, i.m.) 19 d after CIDR removal on d 33. Cows assigned to the 14-16 d CIDR-PG protocol (n = 195) received CIDR inserts from d 3 to 17, and PG 16 d after CIDR removal on d 33. Cows in both treatments were artificially inseminated on d 36, 72 h after PG, with GnRH (100 [mu]g i.m.) at FTAI. Blood samples for progesterone (P4) were collected at d – 10 and d 0 to determine pretreatment estrous cyclicity status, and again at PG. Blood samples for estradiol (E2) were collected at PG and FTAI. HeatWatch estrus detection transmitters were utilized from CIDR removal until FTAI to determine onset of estrus following CIDR removal and PG. Dominant follicle diameter was determined via ultrasonagraphy at PG and FTAI. Ultrasound pregnancy diagnosis was performed 70 d after FTAI and confirmed at d 140 of gestation. Cows in both treatments had similar size dominant follicles at PG, and FTAI. Progesterone at PG was higher for 14-16 d CIDR-PG treated cows compared to 14-19 d treated cows. Mean concentrations of E2 were similar between treatments at PG, but were higher at FTAI for 14-16 d CIDR-PG treated cows. There were no differences between treatments in E2 at FTAI for cows that failed to exhibit estrus after PG. Estrous response after PG was higher for cows assigned to the 14-19 d CIDR-PG protocol. Estrous response after PG among cows [less than or equal to] 4 yr was higher for cows assigned to the 14-19 d CIDR-PG protocol, but there were no differences between treatments for cows [less than or equal to] 3 yr. There were no differences between treatments for FTAI pregnancy rate. However, pregnancy rate after FTAI among cows [greater than or equal to] 4 yr tended to be higher for cows assigned to the 14-19 d CIDR-PG protocol. In summary, both protocols worked effectively to synchronize estrus and ovulation prior to FTAI in postpartum beef cows, suggesting that a range in interval from CIDR removal to PG may be feasible when using long-term CIDR-based protocols. Higher estrous response rates after PG and improvements in FTAI pregnancy rate for 14-19 d treated cows [greater than or equal to] 4 yr of age warrants further consideration. Advisors/Committee Members: Patterson, David J. (David James), 1954- (advisor).

Subjects/Keywords: reproductive performance; estrous synchronization; beef heifers

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APA (6^th Edition):

Martin, N. T. (2012). Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/33151

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):

Martin, Neal Timothy. “Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows.” 2012. Thesis, University of Missouri – Columbia. Accessed April 12, 2021. http://hdl.handle.net/10355/33151.

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

MLA Handbook (7^th Edition):

Martin, Neal Timothy. “Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows.” 2012. Web. 12 Apr 2021.

Vancouver:

Martin NT. Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10355/33151.

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

Council of Science Editors:

Martin NT. Comparison of long-term CIDR-based protocols to synchronize estrus and ovulation prior to fixed-time artificial insemination in postpartum beef cows. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/33151

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

University of Pretoria

20. Holm, D.E. (Dietmar Erik). Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography.

Degree: Production Animal Studies, 2013, University of Pretoria

URL: http://hdl.handle.net/2263/40281

► A series of 4 observational studies was performed on a Bovelder herd at Johannesburg Water’s Northern Farm. The heifer and cow breeding seasons started on… (more)

▼ A series of 4 observational studies was performed on a Bovelder herd at Johannesburg Water’s Northern Farm. The heifer and cow breeding seasons started on 15 October and 1 November every year, and consisted of 50 d and 60 d of oestrus observation respectively, with once daily artificial insemination (AI). Five to 7 days after the AI period bulls were added in multi-sire groups for a period of 42 d. Pregnancy diagnoses were performed between 23 March and 26 April every year. The farming system had been in place for >25 years, with few deviations. In the first study, reproductive tract scoring (RTS) by transrectal palpation on a 5- point scale was performed 1 day before the start of breeding on a group of heifers (n = 272) born in 2002. Heifers with RTS 1 or 2 were estimated to be pre-pubertal, those with RTS 3 pubertal and those with RTS 4 or 5 post-pubertal. Pre-breeding body weight (BW) and body condition score (BCS) were recorded, and Kleiber ratio (KR) was calculated (average daily gain/end weight0.75). Heifers were followed until they weaned their first calves. The objectives of this study were to determine if RTS is a valid tool to predict reproduction and production performance in limited bred beef heifers, and to compare its predictive value with that of BW, BCS, age and KR. After adjustment for BW and age, RTS was positively associated with pregnancy rate to the 50 day AI season (P < 0.01), calf weaning weight (P < 0.01) and pregnancy rate to the subsequent breeding season (P < 0.01), and negatively associated with days to calving (P < 0.01). RTS was a better predictor of fertility than was vi KR, and similar in its prediction of calf weaning weight. It was concluded that RTS is a predictor of heifer fertility and compares well with other traits used as a predictor of production outcomes. It was further hypothesised that RTS may predict long-term reproductive performance due to its association with pregnancy outcome and days to calving after first breeding, combined with reports that heifers calving early tend to calve early in subsequent seasons and have increased lifetime production. In study 2, a 7-year longitudinal study, 292 beef cows in two age cohorts were observed from 1-2 d before their first breeding season (day of RTS), until they had weaned up to 5 calves. Years to reproductive failure was defined as the number of years until a cow failed to become pregnant during the AI season. Animals with RTS 1 or 2 were at increased risk of early reproductive failure compared to those with RTS 4 or 5 (HR = 1.4, 95% CI 1.0, 1.9) despite the fact that RTS was not associated with calving rate or days to calving after the second calving season. The predictive value of RTS was lower in the age cohort with a higher prevalence of anoestrus. Most animals with RTS 1 or 2 that were subsequently detected in oestrus were in early to mid di-oestrus at the time of scoring. It was concluded that RTS is a valid culling tool to improve long-term reproductive success in a seasonal breeding… Advisors/Committee Members: Thompson, P.N. (Peter N.) (advisor), Nielen, Mirjam (coadvisor), Irons, Pete Charles (coadvisor).

Subjects/Keywords: Beef heifers; Reproductive tract score; UCTD; RTS

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APA (6^th Edition):

Holm, D. E. (. E. (2013). Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/40281

Chicago Manual of Style (16^th Edition):

Holm, D E (Dietmar Erik). “Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography.” 2013. Doctoral Dissertation, University of Pretoria. Accessed April 12, 2021. http://hdl.handle.net/2263/40281.

MLA Handbook (7^th Edition):

Holm, D E (Dietmar Erik). “Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography.” 2013. Web. 12 Apr 2021.

Vancouver:

Holm DE(E. Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography. [Internet] [Doctoral dissertation]. University of Pretoria; 2013. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/2263/40281.

Council of Science Editors:

Holm DE(E. Early determination of the reproductive potential of beef heifers using reproductive tract scoring, pelvimetry and transrectal ultrasonography. [Doctoral Dissertation]. University of Pretoria; 2013. Available from: http://hdl.handle.net/2263/40281

University of Tennessee – Knoxville

21. McFarlane, Zachary David. Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation.

Degree: 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/4877

► Three studies were conducted to determine the effects of stockpiled winter forage species and protein supplementation strategy on heifer growth, reproductive performance, nutritional status, rumen… (more)

▼ Three studies were conducted to determine the effects of stockpiled winter forage species and protein supplementation strategy on heifer growth, reproductive performance, nutritional status, rumen fermentation, and the economic implications of forage-based heifer development. In all three studies, spring-born, beef heifers were stratified by BW and randomly assigned to 1 of 3 stockpiled forages: (1) endophyte-infected tall fescue (TF, Schedonorus arundinaceus (Schreb.) Dumort) (2) big bluestem (Andropogon gerardi Vitman) and indiangrass (Sorghastrum nutans L.) combination (BI), or (3) switchgrass (SG, Panicum virgatum L.). Forage treatments were randomly allocated to receive 1 of 2 supplement types: (1) 0.68 kg·heifer-1·d-1 of dried distiller’s grains with solubles (DDGS) or (2) 0.22 kg·heifer-1·d-1 of blood meal and fish meal (BF), resulting in a 3 × 2 factorial arrangement of treatments. Treatments were initiated in January and concluded in April at the onset of the breeding season. In Exp. 1, BW was greater (P < 0.01) for TF heifers, resulting from an increased (P < 0.01) ADG from initiation to breeding for TF heifers. From January to April, heifers grazing SG and BI pastures had a negative ADG; however, from breeding to final pregnancy diagnosis, SG and BI heifers compensated and had greater (P < 0.01) ADG than TF heifers. Pregnancy rates at fixed timed-AI and overall pregnancy rates did not differ (P ≥ 0.38) by forage or supplement treatment. In Exp. 2, heifers grazing SG pastures had greater (P = 0.04) ruminal acetate concentrations than their counterparts. However, ruminal concentrations of propionate and butyrate were not influenced (P > 0.32) by forage species. Due to an increase in ruminal acetate concentration, ruminal acetate:propionate ratio was greater (P = 0.04) for heifers grazing SG pastures. In Exp. 3, total cost of producing a heifer’s first calf using the three forage-based systems was 1,079 to 1,149/head with tall fescue (TF) being the most expensive forage-based heifer development forage system. Overall, low-input heifer development using stockpiled warm-season forages and protein supplementation may be a viable opportunity to extend the grazing season, lower production costs, and select for more efficient replacement females in the southeastern United States.

Subjects/Keywords: beef heifers; stockpiled forages; heifer development

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APA (6^th Edition):

McFarlane, Z. D. (2018). Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/4877

Chicago Manual of Style (16^th Edition):

McFarlane, Zachary David. “Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation.” 2018. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed April 12, 2021. https://trace.tennessee.edu/utk_graddiss/4877.

MLA Handbook (7^th Edition):

McFarlane, Zachary David. “Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation.” 2018. Web. 12 Apr 2021.

Vancouver:

McFarlane ZD. Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2018. [cited 2021 Apr 12]. Available from: https://trace.tennessee.edu/utk_graddiss/4877.

Council of Science Editors:

McFarlane ZD. Low-Input Heifer Development Using Stockpiled Native Forages and Protein Supplementation. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_graddiss/4877

University of Georgia

22. Eubanks, Valerie Joanne. Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/27944

► The purpose of this study was to evaluate the effect of a general immunostimulant feed supplement on amplifying dairy heifers’ immune response to Staphylococcus aureus… (more)

Subjects/Keywords: Nutritional immunostimulation; dairy heifers, mastitis; Staphylococcus aureus

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APA (6^th Edition):

Eubanks, V. J. (2014). Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/27944

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):

Eubanks, Valerie Joanne. “Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin.” 2014. Thesis, University of Georgia. Accessed April 12, 2021. http://hdl.handle.net/10724/27944.

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

MLA Handbook (7^th Edition):

Eubanks, Valerie Joanne. “Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin.” 2014. Web. 12 Apr 2021.

Vancouver:

Eubanks VJ. Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10724/27944.

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

Council of Science Editors:

Eubanks VJ. Immunostimulating effects of a commercial feed supplement in dairy heifers vaccinated with a Staphylococcus aureus bacterin. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/27944

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

University of Georgia

23. Jackson, Kayla. Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/27486

► A reproducible challenge model for inducing Streptococcus uberis mastitis in dairy heifers was developed. Heifers were assigned 2 quarters to receive an infusion of Strep.… (more)

Subjects/Keywords: Experimental challenge; dairy heifers; mastitis; Streptococcus uberis

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APA (6^th Edition):

Jackson, K. (2014). Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/27486

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):

Jackson, Kayla. “Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers.” 2014. Thesis, University of Georgia. Accessed April 12, 2021. http://hdl.handle.net/10724/27486.

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

MLA Handbook (7^th Edition):

Jackson, Kayla. “Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers.” 2014. Web. 12 Apr 2021.

Vancouver:

Jackson K. Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10724/27486.

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

Council of Science Editors:

Jackson K. Development of a challenge model to experimentally induce Streptococcus uberis mastitis in bred dairy heifers. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/27486

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

Massey University

24. Green, Talia Corina. Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes.

Degree: MS, Animal Science, 2012, Massey University

URL: http://hdl.handle.net/10179/4136

► Residual feed intake (RFI) is a measure of an individual’s efficiency in utilising feed for maintenance and production during growth or lactation. It can be… (more)

▼ Residual feed intake (RFI) is a measure of an individual’s efficiency in utilising feed for maintenance and production during growth or lactation. It can be defined as the difference between the actual and predicted feed intake of that individual. Efficient animals eat less than predicted for their body weight and level of performance, and inefficient animals eat more. The objective of this study was to investigate possible relationships between RFI and behavioural traits, such as feeding behaviour, social dominance, and activity in young dairy heifers. The intakes and liveweights of 1049 growing dairy heifers (6-8 months of age, 195 ± 25.8 kg liveweight) in five cohorts were measured for 42-49 days to ascertain individual RFI. Animals were housed in an outdoor feeding facility comprising 28 pens, each with eight animals and one feeder per pen, and were fed a dried, cubed lucerne diet. An electronic feed monitoring system measured the intake and feeding behaviour of individuals. Intake was moderately to strongly correlated with RFI for individual cohorts (r = 0.54-0.74; p < 0.001), indicating that efficient animals ate less than inefficient animals. Several other feeding behaviour traits were related to RFI, but the relationships were weak (r = 0.14-0.26; p < 0.05) suggesting that feeding behaviour is not a reliable predictor of RFI in growing dairy heifers. Statistical comparison of the extremes of RFI (104 most and 104 least efficient) showed that the most efficient animals (low-RFI) had similar liveweight and average daily gain to the least efficient (high-RFI) (p > 0.05) but ate less (mean ± SED; 6.97 v 8.75 ± 0.10 kg cubes), had fewer meals (6.3 v 8.2 ± 0.61/d), shorter daily feeding duration (2.71 v 2.85 ± 0.07 h), ate longer meals (35.6 v 30.6 ± 1.54 min/meal), and ate more slowly (45.4 v 53.0 ± 1.36 g cubes/min) than the least efficient animals (all p < 0.05). These groups also differed in their feeding patterns over 24 h. Video recordings of 32 animals showed that daily activity included (mean ± SEM) 15.4 ± 0.5 h lying, 4.8 ± 0.5 h standing, and 2.9 ± 0.1 h feeding. However, neither social status nor activity were related to RFI in this study (p > 0.05). Feeding behaviour explained only a small proportion of the variation in RFI in dairy heifers. Selecting animals for low RFI (efficient) is unlikely to affect social dominance and activity, although these results should be confirmed in a grazing environment representative of most New Zealand dairy farms.

Subjects/Keywords: Dairy cattle; Feed utilization efficiency; Heifers

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

APA (6^th Edition):

Green, T. C. (2012). Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/4136

Chicago Manual of Style (16^th Edition):

Green, Talia Corina. “Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes.” 2012. Masters Thesis, Massey University. Accessed April 12, 2021. http://hdl.handle.net/10179/4136.

MLA Handbook (7^th Edition):

Green, Talia Corina. “Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes.” 2012. Web. 12 Apr 2021.

Vancouver:

Green TC. Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes. [Internet] [Masters thesis]. Massey University; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10179/4136.

Council of Science Editors:

Green TC. Relationships between behavioural traits, residual feed intake, and average daily gain in growing dairy heifers fed lucerne cubes. [Masters Thesis]. Massey University; 2012. Available from: http://hdl.handle.net/10179/4136

Massey University

25. Stephen, Melissa Anne. Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle.

Degree: MS,MS, Animal Breeding and Genetics, 2019, Massey University

URL: http://hdl.handle.net/10179/15700

► The purpose of this research was to establish the utility of adolescent live weight data measured across cohorts of growing animals for predicting live weight… (more)

▼ The purpose of this research was to establish the utility of adolescent live weight data measured across cohorts of growing animals for predicting live weight in first lactation. Live weight is associated with the growth and maintenance feed requirements of a cow. Selection that simultaneously takes account of milk income and feed requirements of dairy cattle can increase future farm profitability. Estimated breeding values (EBVs) for mature cow live weight are currently predicted using Live weight phenotypes measured during lactation. Breeding companies in NZ actively measure the first lactation live weight of a small proportion of the nation’s dairy cows—the daughters of their bulls—to improve their ability to identify superior bulls. Accurate EBVs obtained at an earlier age can allow reliable selection of superior young bulls which would shorten the generation interval, increasing the rate of genetic progress. The purpose of this research was to determine the utility of adolescent live weight (i.e. live weight prior to first lactation) for predicting variation in live weight measured in first lactation. We completed two studies. In the first study (Section 4), we produced the (co)variance parameters for live weights measured at four ages, from six months old through to first lactation. Our hypothesis for this study was that live weight measured through adolescence would share a strong positive genetic relationship with live weight measured during lactation. Our results support this hypothesis, as estimates of genetic correlations between weights at different ages ranged from 0.79 to 0.97. In the second study (Section 5), we produced live weight EBVs using live weight measured though adolescence. For comparison, we produced EBVs using just live weight measured during first lactation. Our hypothesis was that the accuracy of the live weight EBVs would be improved by including adolescent live weight. Our results showed that including adolescent live weight phenotypes improved the accuracy of the live weight EBVs for animals with adolescent live weights, and their progeny. We concluded that adolescent live weights are a useful predictor of live weight later in life, and should be incorporated as a predictor trait for the national live weight EBV in NZ.

Subjects/Keywords: Dairy cattle; New Zealand; Weight; Heifers; Breeding

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APA (6^th Edition):

Stephen, M. A. (2019). Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/15700

Chicago Manual of Style (16^th Edition):

Stephen, Melissa Anne. “Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle.” 2019. Masters Thesis, Massey University. Accessed April 12, 2021. http://hdl.handle.net/10179/15700.

MLA Handbook (7^th Edition):

Stephen, Melissa Anne. “Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle.” 2019. Web. 12 Apr 2021.

Vancouver:

Stephen MA. Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle. [Internet] [Masters thesis]. Massey University; 2019. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10179/15700.

Council of Science Editors:

Stephen MA. Determining the utility of adolescent live weight data to predict two-year-old live weight in New Zealand dairy cattle. [Masters Thesis]. Massey University; 2019. Available from: http://hdl.handle.net/10179/15700

26. Dias, Henrique Pedro [UNESP]. Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore.

Degree: 2015, Universidade Estadual Paulista (UNESP)

URL: http://hdl.handle.net/11449/136115

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O objetivo do presente trabalho foi investigar o efeito da concentração de P4 sobre a abundância de RNAm do LHR e enzimas esteroidogênicas em células da granulosa de folículo dominante (FD) em novilhas Nelore. Hipotetizamos que a alta progesterona afetaria negativamente a expressão do LHR e enzimas esteroidogênicas proporcionando menor desenvolvimento folicular. Para tanto, 52 novilhas Nelore foram pré-sincronizadas (D-17: 2mg BE + dispositivo intravaginal de progesterona CIDR®; D-10: 12,5mg PGF2α Lutalyse®; D-8: 0,5 mg ECP® e retirada CIDR®). As novilhas que responderam à présincronização (presença de CL) foram submetidas à ablação folicular e colheita de sangue no D0 e aleatoriamente distribuídas em 6 grupos: G1: Alta P4-D5 (implante de CIDR1 (novo) no D0 e abatidas após 5 dias); G2: Baixa P4-D5 (implante de CIDR3 (previamente utilizado por 18 dias) no D0 e aplicação de 25mg PGF2α no D0 e no D1, abate no D5); G3: Alta P4-D6 (implante de CIDR1 e abatidas após 6 dias); G4: Baixa P4- D6 (implante de CIDR3 no D0 e aplicação de 25mg PGF2α no D0 e no D1, abate no D6); G5: Alta P4 + PE (proestro) (implante de CIDR1 no D0, retirada do CIDR, colheita de sangue e aplicação de 25mg PGF2α no D5 e abatidas no D6); G6: Baixa P4 + PE (implante de CIDR3 no D0 e aplicação de 25mg PGF2α no D0 e no D1, retirada do CIDR, colheita de sangue e aplicação de 25mg PGF2α no D5 e abatidas no D6). Os ovários foram retirados, o FD mensurado e dissecado para obtenção das células da granulosa. As concentrações plasmáticas e intrafoliculares de P4, E2 e IGF-1 livre foram mensuradas. As comparações do efeito da duração (G1 e G2 x G3 e G4), efeito do proestro (G3 e G4 x G5 e G6) e efeito da concentração de P4 e suas interações, sobre os níveis de ...

The aim of this study was to investigate the effect of P4 concentration on the abundance of LHR mRNA and steroidogenic enzymes in granulosa cells of the dominant follicle (DF) in Nellore heifers. High progesterone negatively affects the expression of LHR and steroidogenic enzymes, providing lower follicular development. 52 Nellore heifers were pre-synchronized (D-17: BE + 2 mg intravaginal device CIDR® progesterone; D-10: 12.5 mg PGF2a Lutalyse®; D-8: 0.5 mg ECP® and withdrawal CIDR®). Heifers who responded to the pre-synchronization (presence of CL) underwent follicular ablation and blood collection on D0 and randomly divided into 6 groups: G1: High P4-D5 (implant CIDR1 (new) on D0 and slaughtered after 5 days); G2: Low P4-D5 (implant CIDR3 (previously used for 18 days) on D0 and 25mg PGF2a in D0 and D1, D5 slaughter); G3: High P4-D6 (implant CIDR1 and slaughtered after 6 days); G4: Low P4-D6 (CIDR3 implant in D0 and application of 25mg PGF2a in D0 and D1, slaughter D6); G5: High P4 + PE (proestrus) (CIDR1 implant in D0, CIDR, blood…

Advisors/Committee Members: Universidade Estadual Paulista (UNESP), Vasconcelos, José Luiz Moraes [UNESP].

Subjects/Keywords: Nelore (Zebu) - Reprodução; Ciclo estral; Progesterona; Heifers

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

APA (6^th Edition):

Dias, H. P. [. (2015). Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore. (Masters Thesis). Universidade Estadual Paulista (UNESP). Retrieved from http://hdl.handle.net/11449/136115

Chicago Manual of Style (16^th Edition):

Dias, Henrique Pedro [UNESP]. “Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore.” 2015. Masters Thesis, Universidade Estadual Paulista (UNESP). Accessed April 12, 2021. http://hdl.handle.net/11449/136115.

MLA Handbook (7^th Edition):

Dias, Henrique Pedro [UNESP]. “Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore.” 2015. Web. 12 Apr 2021.

Vancouver:

Dias HP[. Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore. [Internet] [Masters thesis]. Universidade Estadual Paulista (UNESP); 2015. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/11449/136115.

Council of Science Editors:

Dias HP[. Efeito da progesterona na expressão do RNAm do receptor de LH e enzimas esteroidogênicas reguladoras do desenvolvimento folicular em células da granulosa de novilhas nelore. [Masters Thesis]. Universidade Estadual Paulista (UNESP); 2015. Available from: http://hdl.handle.net/11449/136115

Cornell University

27. Molano Torres, Rodrigo. NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS.

Degree: PhD, Animal Science, 2020, Cornell University

URL: http://hdl.handle.net/1813/103076

► Dairy cattle replacement programs should provide management and nutrition that best supports the evolving needs of the developing heifer during all phases of rearing. The… (more)

▼ Dairy cattle replacement programs should provide management and nutrition that best supports the evolving needs of the developing heifer during all phases of rearing. The work described in this dissertation had two main objectives, i) to evaluate the supplementation of nutrients that could be limiting for dairy calves transitioning from the preruminant to the ruminant state, and ii) to quantify energy and protein requirements of the growing dairy animal. The first objective was addressed with two feeding trials evaluating what are considered limiting nutrients during the weaning phase. The first study tested the inclusion of different forms of methionine (Met), one rumen-protected and two different analogs (HMBTa and HMBi), in the calf starter. Calves fed the starter with HMBi consumed more feed postweaning and where heavier at the end of the study, but overall calves seemed not to be limited by Met. The second feeding trial assessed the effect of the combined supplementation of B-vitamins and choline on measures of performance and vitamin adequacy, and results suggested that dairy calves could obtain sufficient B-vitamins and choline from the diet and rumen synthesis to support growth rates over 1 kg/d. For the second objective, a database was constructed by merging eight comparative slaughter studies conducted on growing dairy cattle. Using this data set as input, a first analysis explored different aspects concerning nutritional energetics and generated new maintenance requirements coefficients, estimates of efficiency of ME utilization and predictive equations for energy retention for preruminant and ruminant dairy cattle. A variable efficiency of ME utilization for growth calculated as a function of feeding level offered the best prediction ability of energy retention. Finally, a subsequent analysis generated a system of equations to predict net requirements, true supply and efficiencies of use of N and AA for young preruminant dairy calves. Requirements were defined based on the supply of N and AA per Mcal from total ME and carbohydrate ME. A combined variable efficiency allowed the best prediction of N and AA balance on a net basis. Together both models improved the understanding on nutrient partitioning and enhanced the accuracy to predict nutrient requirements and utilization in growing dairy cattle. Advisors/Committee Members: Amburgh, Mike Van (chair), Nydam, Daryl Van (committee member), Boisclair, Yves R. (committee member).

Subjects/Keywords: Amino acids; Calves; Energy; Heifers; Nutrition; Vitamins

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

APA (6^th Edition):

Molano Torres, R. (2020). NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/103076

Chicago Manual of Style (16^th Edition):

Molano Torres, Rodrigo. “NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS.” 2020. Doctoral Dissertation, Cornell University. Accessed April 12, 2021. http://hdl.handle.net/1813/103076.

MLA Handbook (7^th Edition):

Molano Torres, Rodrigo. “NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS.” 2020. Web. 12 Apr 2021.

Vancouver:

Molano Torres R. NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS. [Internet] [Doctoral dissertation]. Cornell University; 2020. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/1813/103076.

Council of Science Editors:

Molano Torres R. NUTRIENT REQUIREMENTS AND UTILIZATION IN DAIRY CALVES AND HEIFERS. [Doctoral Dissertation]. Cornell University; 2020. Available from: http://hdl.handle.net/1813/103076

University of Florida

28. Moriel, Philipe. Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves.

Degree: PhD, Animal Sciences, 2013, University of Florida

URL: https://ufdc.ufl.edu/UFE0045739

► Two 2-yr experiments evaluated the long-term effects of metabolic imprinting and different nutritional management systems for EW beef calves (Bos spp.). Experiment 1 evaluated the… (more)

▼ Two 2-yr experiments evaluated the long-term effects of metabolic imprinting and different nutritional management systems for EW beef calves (Bos spp.). Experiment 1 evaluated the growth performance, carcass characteristics and muscle gene expression of beef steers, while experiment 2 evaluated the liver gene expression, growth and reproductive performance of beef heifers. In both experiments, calves were normally weaned (NW) at 250 d of age (d 180), or early-weaned (EW) at 70 d of age (d 0) and randomly assigned to 1 of 3 EW calf management systems: 1) EW and limit-fed a high-concentrate diet in drylot for at least 180 d; 2) EW and limit-fed a high-concentrate diet in drylot for 90 d, then bahiagrass grazing until the time of NW (d 180); and 3) EW and ryegrass grazing for 60 to 90 d, then bahiagrass grazing until the time of NW. Experiment 1 demonstrated that overall growth performance of EW steers was similar or greater than NW steers. Early-weaned calves provided a high-concentrate diet in drylot for at least 90 d had greater body weight at the time of NW, and enhanced growth performance during the first 28 d of the finishing phase, when compared to NW and EW steers grazing annual ryegrass pastures. Also, feeding a high-concentrate diet to EW steers for at least 90 d enhanced plasma concentrations of IGF-1, and the expression of genes associated with growth (muscle IGF-1 receptor and paired box gene 7) and adipose tissue formation (peroxisome proliferator-activated receptor ?). However, early-exposure to high-concentrate diets did not affect the overall carcass characteristics and marbling scores of steers slaughtered at a common backfat thickness. Experiment 2 demonstrated that EW heifers provided a high-concentrate diet for at least 90 d in drylot and EW heifers grazed on ryegrass pastures, had similar or greater growth performance than NW heifers. Furthermore, it provided evidence that early-exposure to a high-concentrate diet lead to metabolic imprinting effects, such as altered liver IGF-1 expression (during periods of similar nutritional management) and early puberty achievement of Bos indicus-influenced beef heifers. Calf weaning at the onset of the breeding season enhanced cow growth performance, and tended to enhance reproductive performance of multiparous cows. ( en ) Advisors/Committee Members: Arthington, John David (committee chair), Hersom, Matthew J (committee member), Johnson, Sally E (committee member), Vendramini, Joao Mauricio Bueno (committee member), Gerrard, David E (committee member), Mccann, Mark (committee member).

Subjects/Keywords: Beef; Calves; Cattle; Early weaning; Heifers; Messenger RNA; Pastures; Plasmas; Puberty; Weaning; early-weaning – heifers – imprinting – metabolic – steers

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

APA (6^th Edition):

Moriel, P. (2013). Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0045739

Chicago Manual of Style (16^th Edition):

Moriel, Philipe. “Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves.” 2013. Doctoral Dissertation, University of Florida. Accessed April 12, 2021. https://ufdc.ufl.edu/UFE0045739.

MLA Handbook (7^th Edition):

Moriel, Philipe. “Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves.” 2013. Web. 12 Apr 2021.

Vancouver:

Moriel P. Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2021 Apr 12]. Available from: https://ufdc.ufl.edu/UFE0045739.

Council of Science Editors:

Moriel P. Long-Term Effects of Metabolic Imprinting and Calf Management Systems following Early-Weaning on Growth and Reproductive Performance of Beef Calves. [Doctoral Dissertation]. University of Florida; 2013. Available from: https://ufdc.ufl.edu/UFE0045739

Kansas State University

29. Simon, Michael Charles. The effect of management option on the performance of pregnant feedlot heifers.

Degree: 1983, Kansas State University

URL: http://hdl.handle.net/2097/13035

Subjects/Keywords: Heifers – Feed utilization efficiencyComparative studies; Heifers – Marketing; Feedlots – Management

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

APA (6^th Edition):

Simon, M. C. (1983). The effect of management option on the performance of pregnant feedlot heifers. (Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/13035

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):

Simon, Michael Charles. “The effect of management option on the performance of pregnant feedlot heifers.” 1983. Thesis, Kansas State University. Accessed April 12, 2021. http://hdl.handle.net/2097/13035.

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

MLA Handbook (7^th Edition):

Simon, Michael Charles. “The effect of management option on the performance of pregnant feedlot heifers.” 1983. Web. 12 Apr 2021.

Vancouver:

Simon MC. The effect of management option on the performance of pregnant feedlot heifers. [Internet] [Thesis]. Kansas State University; 1983. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/2097/13035.

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

Council of Science Editors:

Simon MC. The effect of management option on the performance of pregnant feedlot heifers. [Thesis]. Kansas State University; 1983. Available from: http://hdl.handle.net/2097/13035

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

Kansas State University

30. Fleck, Arnold T. Effect of varied growth from birth through thirty months of age on the performance of beef heifers.

Degree: MS, 1978, Kansas State University

URL: http://hdl.handle.net/2097/26865

Subjects/Keywords: Heifers – Feeding and feeds.; Heifers – Growth.; Masters theses

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

APA (6^th Edition):

Fleck, A. T. (1978). Effect of varied growth from birth through thirty months of age on the performance of beef heifers. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/26865

Chicago Manual of Style (16^th Edition):

Fleck, Arnold T. “Effect of varied growth from birth through thirty months of age on the performance of beef heifers.” 1978. Masters Thesis, Kansas State University. Accessed April 12, 2021. http://hdl.handle.net/2097/26865.

MLA Handbook (7^th Edition):

Fleck, Arnold T. “Effect of varied growth from birth through thirty months of age on the performance of beef heifers.” 1978. Web. 12 Apr 2021.

Vancouver:

Fleck AT. Effect of varied growth from birth through thirty months of age on the performance of beef heifers. [Internet] [Masters thesis]. Kansas State University; 1978. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/2097/26865.

Council of Science Editors:

Fleck AT. Effect of varied growth from birth through thirty months of age on the performance of beef heifers. [Masters Thesis]. Kansas State University; 1978. Available from: http://hdl.handle.net/2097/26865

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Open Access Theses and Dissertations