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Updated: May 24, 2025

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哺乳乳奶牛的生育计划:一种新的前同步+定时人工授精计划 (双E-Synch) 产生与双Ovsynch相似的卵巢动态,同步和生育能力

Carlos E C Consentini¹, Tattiany Abadia², Juan P A Galindez³

¹Department of Animal Science, University of São Paulo, Piracicaba, SP, 13418-900, Brazil; Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706; GlobalGen vet science, Jaboticabal, SP, 14887-360, Brazil.

Journal of dairy science

|March 5, 2025

概括

两个预同步策略和两个定时人工授精 (TAI) 协议在哺乳乳母牛中进行了评估. 这四个生育计划都显示出有效的卵巢控制,同步和高生育率.

科学领域:

牲畜中的生殖生理学
乳牛的繁殖乳牛的繁殖
人工授精协议的人工授精协议

背景情况:

优化产后奶牛的生育能力对于群体的生产力至关重要.
定时人工授精 (TAI) 协议旨在通过受控排卵来提高受孕率.
与TAI协议一起评估不同的预同步策略可以提高生殖效率.

研究的目的:

为了评估两个预同步策略与两个TAI协议相结合在哺乳乳奶牛中的有效性.
评估这些计划对卵巢动态,雌性表达和人工授精 (P/AI) 妊娠的影响.
为第一个产后TAI建立有效的生育计划.

主要方法:

一个2x2的因数排列评估了两个预同步 (Ovsynch和PreP4/E2) 和两个TAI协议 (Ovsynch和OvsP4/E2) 在800只哺乳乳母牛中.
激素治疗包括GnRH,PGF2α模拟物和雌激素酸,按照特定的时间表进行.
用SAS 9.4.4监测和统计分析了卵巢活动,雌性表达和怀孕率.

主要成果:

与Ovsynch的预同步增加了在TAI启动时牛体黄体 (CL) 的百分比.
在最初的GnRH治疗后,PreP4/E2预同步策略导致更高的排卵率.
表达雌激素的奶牛在两个TAI协议中与不表达雌激素的奶牛相比,P/AI显著更高.

结论:

该研究验证了四个结合两个预同步和两个TAI协议的生育计划,所有这些都产生了控制良好的卵巢动态和高生育率.
双Ovsynch和双E-Synch协议都显示出可比的生殖结果.
在这些TAI计划中,有效的雌激体表达是影响每次人工授精成功怀孕的关键因素.

关键词:

乳牛牛奶牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛生育能力生育能力生育能力生育能力时间同步同步同步同步有时间的人工授精.

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