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在牛肉牛的固定时间AI计划中使用复合马体胆管性淋巴激素 (reCG)

Luciano Cattaneo¹, Claudio Prieto², Darío Ojeda³

¹Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Esperanza, Santa Fe, Argentina; CEVA-ZOOVET S.A., Santa Fe, Argentina.

|July 19, 2024

概括

再组合eCG (reCG) 在接受人工授精的肉牛中改善了怀孕率. 剂量在不同品种的有效性上有所不同,在Bos taurus和杂交牛中看到的最佳结果.

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:

人工授精 (AI) 协议对于肉牛的繁殖至关重要.
激素治疗,包括马类胆性腺激素 (eCG),用于雌激素同步.
新的重组eCG (reCG) 在生殖技术方面提供了潜在的进步.

研究的目的:

评估一种新型重组eCG (reCG) 在人工授精 (P/AI) 后怀孕率上的疗效.
评估reCG对不同品种的哺乳肉牛 (Bos taurus,Bos indicus和杂交品种) 的影响.
为了比较reCG治疗与传统的血清衍生的eCG (PMSG) 和对照组.

主要方法:

三项实验涉及同步哺乳的肉牛 (Bos taurus,Bos taurus x Bos indicus,Bos indicus). 这三种实验的结果是:
奶牛接受了基于孕激素 (P4) 的固定时间AI (FTAI) 协议.
在AI处给予不同剂量的reCG (84,105,140 IU) 或PMSG,对照组没有接受eCG.

主要成果:

与对照群相比,reCG在Bos taurus和Bos taurus x Bos indicus奶牛中显著增加了P/AI.
在Bos indicus奶牛中,84 IU的reCG显示P/AI与PMSG相比较,但较高的reCG剂量降低了生育能力.
雌激素率和P/AI在接受reCG治疗的Bos taurus奶牛与对照群相比显著更高.

结论:

当与FTAI协议一起使用时,reCG有效地提高了哺乳Bos taurus和杂交牛肉母牛的生育能力.
剂量优化至关重要;较高的reCG剂量可能对Bos indicus奶牛有害.
reCG是改善肉牛生殖效率的有希望的工具.

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