泌乳奶牛抗勒氏杆菌激素与产奶量、动情表达及首次受胎率的关系

IF 2.5 2区 农林科学 Q3 REPRODUCTIVE BIOLOGY
K.J. Alward , W.M. Graves , R.A. Palomares , L.O. Ely , J.F. Bohlen
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引用次数: 0

摘要

勒氏杆菌激素(AMH)浓度与窦卵泡计数(AFC)呈正相关,可作为奶牛整体生育力的生物标志物。本研究旨在通过育种方案确定泌乳奶牛循环AMH浓度与产奶量、动情表达和首次受胎率(FSCR)的关系。选取初产和多产的哺乳期纯种荷斯坦奶牛(n = 245头),于45-60天饲喂乳汁(DIM)。入组时采血检测AMH,经直肠超声记录AFC、黄体(CL)和循环状态。实验动物分为两组,一组为发情检测组(n = 152),另一组为定时人工授精组(n = 93)。记录采食和饲养当天的7D平均奶重(7D奶重)、饲养时的DIM和FSCR。动物被AMH浓度追溯阻断至HIGH (>282 pg/mL;n = 83) MID (167-278;n = 84)和LOW (<165 pg/mL;N = 78)类进行分析。FSCR未受影响(P >;而7D乳重越大(P = 0.03)和日龄越高(P = 0.08), FSCR越高。AFC升高时,AMH浓度升高(P <;0.01)、7D奶重(P = 0.05)与泌乳数、7D奶重交互作用(P = 0.03)。结果表明,FSCR与AMH类别和育种计划无关。在这项研究中,年龄较大,产量较高的动物AMH浓度增加,更有可能出现发情,因此繁殖的发情检测方案比TAI方案。年龄与AMH浓度对产犊后动情表达的关系值得进一步研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating the relationships between anti-Müllerian hormone, milk production, estrous expression and first service conception rate in lactating dairy cows
Anti-Müllerian hormone (AMH) concentrations are positively associated with antral follicle count (AFC) and may serve as a biomarker of overall fertility in dairy cattle. This study aimed to determine whether circulating AMH concentration in lactating dairy cows is associated with milk production, estrous expression and first service conception rate (FSCR) by breeding protocol. Primiparous and multiparous (n = 245) purebred, lactating Holstein cows were enrolled at 45–60 days in milk (DIM). Blood was collected at enrollment for AMH and transrectal ultrasonography was performed to record AFC, corpora lutea (CL) and cyclicity status. Animals were bred either to an estrous detection (n = 152) or timed artificial insemination (TAI) (n = 93). Seven-day average milk-weight (7D milk weight) on the day of sampling and breeding, DIM at breeding and FSCR were recorded. Animals were retroactively blocked by AMH concentration into HIGH (>282 pg/mL; n = 83) MID (167–278; n = 84) and LOW (<165 pg/mL; n = 78) categories for analysis. The FSCR was not impacted (P > 0.05) by AMH category, breeding protocol or DIM, however, greater 7D milk weight (P = 0.03) and increased age (P = 0.08) tended to increase FSCR. AMH concentration was increased in cows with increased AFC (P < 0.01), 7D milk weight (P = 0.05) and lactation number, 7D milk weight interaction (P = 0.03). In conclusion, FSCR was not related to AMH category or breeding program. In this study, older, higher producing animals had increased AMH concentrations and were more likely to display estrus and thus bred to an estrous detection protocol than a TAI protocol. The relationship between age and AMH concentration on estrous expression post-calving warrant further investigation.
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来源期刊
Theriogenology
Theriogenology 农林科学-生殖生物学
CiteScore
5.50
自引率
14.30%
发文量
387
审稿时长
72 days
期刊介绍: Theriogenology provides an international forum for researchers, clinicians, and industry professionals in animal reproductive biology. This acclaimed journal publishes articles on a wide range of topics in reproductive and developmental biology, of domestic mammal, avian, and aquatic species as well as wild species which are the object of veterinary care in research or conservation programs.
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