低生育率乳牛的繁殖效率,接受了前同步-对同步或双对同步方案,以首次服务
Luis Gustavo Delamanha Mendonça1, Kenneth Wronka2, Guy Fridkovski3
1Merck Animal Health Technology Labs, Rahway, NJ 07065, USA.
Animals : an open access journal from MDPI
|February 26, 2025
概括
一个新的生育指数准确地识别出低生殖效率的奶牛. 像双双Ovsynch这样的荷尔蒙干预改善了第一次服务率,但并没有增加这些母牛的整体怀孕率.
科学领域:
- 乳牛的繁殖 乳牛的繁殖
- 生殖内分泌学 生殖内分泌学
- 群体管理管理 群体管理
背景情况:
- 乳制品运营的利能力受到生殖效率的重大影响.
- 识别和改善低于最佳生育能力的奶牛的生殖表现至关重要.
- 需要进一步的研究来评估对低生育率奶牛的干预措施.
研究的目的:
- 通过使用专有生育指数,识别出具有低于最佳生育能力的乳牛子群.
- 评估激素干预措施 (前同步-双同步和双同步) 在提高低生育率奶牛的生殖效率方面的有效性.
主要方法:
- 根据50天牛奶 (DIM) 的生育指数,奶牛被分为低或高生育率.
- 每周的队列被分配到三个治疗组:高生育率/Presynch-Ovsynch (H-PO),低生育率/Presynch-Ovsynch (L-PO) 和低生育率/双重Ovsynch (L-DO).
- 在特定的DIM启动了荷尔蒙方案 (Presynch-Ovsynch或Double-Ovsynch),如果没有检测到雌激素,则进行定时人工授精 (TAI).
主要成果:
- 生育率指数有效地根据妊娠和杀结果区分了奶牛.
- 高生育率的奶牛在第一次服务时需要更少的TAI,怀孕率更高100和250 DIM,杀率更低,怀孕损失更少.
- 与Presynch-Ovsynch相比,在低生育率的奶牛中,双重Ovsynch优化了第一个服务率,但并没有增加每个AI的整体怀孕.
结论:
- 生育率指数是预测乳牛群的生殖结果的宝贵工具.
- 虽然双Ovsynch改善了低生育率奶牛的初始服务率,但它并没有提高整体怀孕成功率.
- 有针对性的激素干预可以优化特定的生殖参数,但需要仔细评估整体群体的生殖效率.
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