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预同步与孕激素和eCG对同步雌羊在无月季期间生殖活动的影响

Baris Guner¹, Recai Kulaksiz², Nevzat Saat¹

¹Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Balikesir University, Balikesir, Turkey.

Veterinarni medicina

|August 22, 2024

概括

在无月季期间在母羊中进行预同步,可降低固定时间人工授精 (FTAI) 后的雌性 response和怀孕率. 然而,在自然交配后,总体怀孕率仍然很高.

科学领域:

生殖生物学生殖生物学
动物科学动物科学
兽医医学兽医医学兽医医学

背景情况:

的季节对雌羊的同步繁殖带来了挑战.
固定时间人工授精 (FTAI) 需要精确的期同步才能获得最佳的成功.

研究的目的:

通过使用FTAI,调查前同步对期期间同步母羊中期发生率和怀孕率的影响.
与标准同步协议相比,评估预同步协议的有效性.

主要方法:

84只Kivircik母羊被分为两个组:预同步 (PRE) 和同步 (SYN).
在PRE组接受了两次连续7天的7天间隔的同步方案,包括孕激素 (P4) 插入,PGF2α,P4移除和马体胆固醇激素 (eCG).
SYN 组获得了一个单一的7天同步协议. 在用新鲜精液去除海绵后54小时进行FTAI.

主要成果:

预同步 (PRE组) 最初显示出较高的雌性反应 (66.7%对0.0%) 和循环率 (64.3%对14.3%) 基于孕激素水平 (P <0.01).
然而,在PRE组 (57.1%) 与SYN组 (95.2%) (P <0.01) 相比,在最终同步协议后96小时内雌激素反应显著较低.
在FTAI后的怀孕率在PRE组 (14.3%) 显著低于SYN组 (35.7%) (P <0.05),尽管在自然交配后的整体怀孕率在两组之间相似 (95.2%).

结论:

预同步协议,特别是两次连续的eCG注射,可以降低期反应,并在期期间在母羊中减少FTAI后的怀孕率.
需要仔细考虑荷尔蒙方案和时间,以避免对同步雌羊的生殖效率产生负面影响.
这些发现突显了优化同步策略的重要性,以最大限度地提高FTAI在季节性风期间在绵羊繁殖计划中的成功.

关键词:

人工授精是一种人工授精.怀孕率怀孕率怀孕率孕激素是孕激素的一种.羊群羊群羊群的羊群是什么意思

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