E2 与 P4 比率与双卵同步后接受人工授精的奶牛的胚胎着床有关,但与发情无关。

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Thainá Minela, Alisson Santos, J Richard Pursley
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引用次数: 0

摘要

泌乳奶牛的妊娠存活率可通过每日妊娠特异性蛋白B(PSPB)监测的胎头附着时间框架来确定。在检测到发情后接受人工授精的奶牛中,导致繁殖力下降的所有因素仍不清楚。本研究旨在确定接受 "Double-Ovsynch "生育计划治疗的泌乳奶牛与检测到发情的奶牛在胚胎着床时间上的差异。此外,我们还调查了可能影响生育结果的各种受孕前后因素。我们假设,与 "双侧同步 "相比,通过自动活动监测器检测到自然发情后进行人工授精会延长受精卵着床时间,并降低着床后的PSPB浓度。不同处理之间的受精卵着床平均时间没有差异。然而,发情后授精的奶牛在受精卵着床后60-66天之间出现妊娠损失,受精卵着床后第2天和第3天的PSPB浓度降低。通过放射免疫测定法评估类固醇激素的相互作用,以确定黄体生成素(LH)激增当天雌激素与孕酮的浓度比。值得注意的是,雌激素与孕酮的比率可预测接受双卵同步授精的奶牛的受精卵着床情况,但不能预测发情检测到激增后授精的奶牛的受精卵着床情况。总之,在排卵前LH激增前后测量的雌激素与孕酮比值是一种潜在的有效工具,可用于估计接受定时人工授精的泌乳奶牛的受精潜力,特别是在双卵同步授精计划中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estrogen to progesterone ratio is associated with conceptus attachment in dairy cows receiving artificial insemination after Double-Ovsynch but not estrus†.

Prediction of pregnancy survival in lactating dairy cows can be determined by the conceptus attachment timeframe via daily pregnancy-specific protein B (PSPB) monitoring. All factors contributing to reduced fertility in dairy cows receiving AI following estrus detection remain unclear. This study aimed to determine differences in time to conceptus attachment in lactating cows treated with the fertility program Double-Ovsynch compared to cows that were detected in estrus. Additionally, we investigated various pre- and post-conception factors potentially influencing fertility outcomes. We hypothesized that AI following a natural estrus detected with automated activity monitors would lead to an extended time to conceptus attachment and lower PSPB concentrations post-attachment compared to Double-Ovsynch. There were no differences in the average time to conceptus attachments between treatments. However, cows inseminated post-estrus that experienced pregnancy loss between conceptus attachment and 60-66 days post-AI exhibited diminished PSPB concentrations on Days 2 and 3 following conceptus attachment. Steroid hormone interactions were assessed with radioimmunoassay to determine the ratios of estrogen to progesterone concentrations on the day of the luteinizing hormone (LH) surge. Notably, estrogen to progesterone ratio proved to predict conceptus attachment in cows subjected to Double-Ovsynch but not in those inseminated post-estrus detection surge. In conclusion, the estrogen to progesterone ratio measured around the time of the pre-ovulatory LH surge emerges as a potentially effective tool for estimating the fertility potential of lactating dairy cows undergoing timed AI, particularly in the context of the Double-Ovsynch program.

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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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