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评估GnRH与基于雌激素的产卵同步协议在产后Bos taurus放牧肉牛接受固定时间人工授精

Luis B Ferré¹, Maria Natalia Cerviño², Julian Jaeschke³

¹Instituto Nacional de Tecnología Agropecuaria (INTA), Chacra Experimental Integrada Barrow, Tres Arroyos, 7500, Buenos Aires, Argentina.

|November 20, 2024

概括

与雌激素酸盐或7天的GnRH协议相比,7 & 7 GnRH协议改善了产后肉牛每AI (P/AI) 的怀孕. 这一协议在固定时间人工授精 (FTAI) 之前增强了孕激素水平和雌激素表达.

科学领域:

生殖内分泌学和牛的人工授精.

背景情况:

固定时间人工授精 (FTAI) 协议对于牛的有效繁殖至关重要.
优化激素治疗,包括雌二醇酸 (EB) 和GnRH,是改善产后奶牛FTAI结果的关键.

研究的目的:

为了比较基于雌二醇酸 (EB) 的7天FTAI协议,基于GNRH的7天FTAI协议和基于GNRH的预同步7和7日FTAI协议的疗效.
为了评估这些协议对每AI (P/AI) 的怀孕在多胎产后安格斯奶牛中的影响.

主要方法:

多次产后安格斯奶牛被分配到三个FTAI协议之一:7天EB,7天GNRH,或7和7GNRH.
激素治疗 (EB, GnRH, P4, PG, eCG, ECP) 和阴道内孕激素释放装置 (IVPD) 插入/移除按特定时间表进行.
测量包括排卵前卵泡直径,黄体 (CL) 存在和面积,孕激素 (P4) 度,雌激素表达和P/AI.

主要成果:

与7天EB协议相比,7 & 7 GnRH协议在IVPD去除时导致更高的血P4度.
在FTAI之前,7和7GnRH组中的奶牛表现出更大的卵巢前卵泡,更大的CL面积和更高的雌激素表达率.
在7日和7日GnRH组 (63.5%) 中,每AI的怀孕率明显高于7日EB (51.4%) 和7日GnRH (51.3%) 组.

结论:

7 & 7 GnRH FTAI 协议有效地增强循环中的孕激素,增加雌激素表达,并改善产后肉牛AI的妊娠.
与标准的7天协议相比,这种预同步的协议为优化放牧肉牛的繁殖效率提供了更好的替代方案.

关键词:

这就是 GnRH.产后的安斯特鲁斯 (Anestrus) 是一个产后的安斯特鲁斯每个AI的怀孕时间预同步预先进行.在前列腺腺内.

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