接受了传统重同步或ReBreed21计划的Nelore (Bos indicus) 奶牛的繁殖效率
Mirela Balistrieri1, Tainá L P Azevedo1, Paula R Cortat1
1Department of Animal Science, Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil.
Theriogenology
|January 28, 2026
概括
与传统方法相比,ReBreed21计划提高了怀孕率,并减少了Nelore奶牛的错误阳性. 在这项研究中,雌激素酸盐剂量没有显著影响生育能力的结果.
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:
- 优化Nelore (Bos indicus) 牛的生殖效率对于牛肉生产至关重要.
- 定时人工授精 (TAI) 程序被广泛使用,但重同步策略可以进一步提高结果.
- 评估像ReBreed21这样的新型重同步协议对于提高群体生育能力至关重要.
研究的目的:
- 通过TAI的重同步程序来评估Nelore奶牛的生殖效率.
- 为了确定 ReBreed21 计划中不同雌二醇酸盐 (EC) 剂量 (0.5 与 1.0 毫克) 对生殖参数的影响.
- 将ReBreed21程序与传统的重同步策略 (Resynch33) 进行比较.
主要方法:
- 共有917头Nelore母牛 (253头母牛,645头多母牛) 被分配给Resynch33,ReBreed21的0.5毫克EC (REB0.5),或ReBreed21的1.0毫克EC (REB1.0).这些母牛被分配给Resynch33,ReBreed21的0.5毫克EC (REB0.5),或ReBreed21的1.0毫克EC (REB1.0).
- 所有的奶牛都经过了TAI的初始同步协议. 在ReBreed21的治疗中,使用了孕激素 (P4) 装置,马体胆腺激素 (eCG) 和EC.
- 怀孕的诊断是使用彩色多普勒超声波进行的. 没有怀孕的母牛被重新受精,并监测怀孕结果 (每AI的怀孕,错误阳性,怀孕丧失).
主要成果:
- 与Resynch33 (52.8%) 相比,ReBreed21计划在繁殖季节的21天后显著增加了怀孕率 (75.4-77.7%).
- 在ReBreed21组 (8.5-10.8天) 怀孕的时间比Resynch33组 (15.8天) 短.
- 与Resynch33 (13.7%) 相比,ReBreed21的虚假阳性发生率较低 (7.5%),怀孕丧失没有显著差异.
结论:
- 通过预测怀孕并改善整体PR,ReBreed21计划有效地提高了Nelore奶牛的生殖效率.
- 在早期PR和减少虚假阳性方面,ReBreed21协议在传统Resynch33策略上表现出显著的优势.
- 在ReBreed21计划中,雌二醇酸盐的剂量 (0.5比1.0毫克) 并没有影响关键的生育指标.
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