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在固定时间人工授精计划中,Nelore奶牛的生殖效率与早期重同步

Larissa de Paiva Nunes Gonçalves¹, Alisson Jordão Prado², Aline Pacheco³

¹Postgraduate Program in Biosciences, Federal University of Western Pará (UFOPA), Santarem 68040-255, PA, Brazil.

Veterinary sciences

|January 24, 2025

概括

在固定时间人工授精 (FTAI) 计划中,Nelore奶牛的早期重同步显示出与传统方法相似的生殖效率. 早期再同步 (22天) 可能会减少分娩间隔,突出显示卵泡大小是排卵成功的关键指标.

科学领域:

生殖生物学生殖生物学
兽医医学兽医医学兽医医学
动物科学动物科学

背景情况:

固定时间人工授精 (FTAI) 计划对于提高牛的生殖效率至关重要.
重新同步协议的目的是通过重新灌输非孕妇动物来最大限度地提高受精率.
评估早期重同步策略对于优化尼罗尔牛的繁殖计划至关重要.

研究的目的:

在FTAI计划中,比较使用早期 (22天) 与传统 (30天) 重新同步的Nelore奶牛的生殖效率.
评估早期重同步对怀孕率和分娩间隔的影响.
在这些协议中调查卵泡动态和排卵成功之间的关系.

主要方法:

468只尼罗尔牛被分为两组:在30天 (R30) 进行常规重同步,并在22天 (R22) 进行早期重同步.
两组都接受了涉及阴道内孕激素装置,类固醇和淋巴激素的同步协议,然后在第一个FTAI后进行了两次重同步.
怀孕率,累积怀孕率和卵泡动态 (排卵卵泡大小) 被监测和分析.

主要成果:

在第一个FTAI期间,R30 (50.85%) 和R22 (48.72%) 组之间的怀孕率没有显著差异.
在FTAI和两个重同步后的累积怀孕率相似 (R30: 80.77%;R22: 82.91%).
较大的排卵卵泡直径 (14.47 ± 2.76 毫米) 与成功排卵有显著的相关性 (p < 0.05).

结论:

在FTAI计划中,早期重同步 (22天) 与Nelore奶牛的常规重同步 (30天) 一样有效.
早期的重同步通过减少分娩间隔提供了潜在的好处.
毛囊直径是排卵可能性的可靠指标,对于牛养殖计划的繁殖成功至关重要.

关键词:

牛肉牛牛肉牛牛肉牛生物技术是生物技术.毛囊动力学毛囊动力学这是一个荷尔蒙协议,一个荷尔蒙协议.

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