在热带复合牛群中,年龄大的雄性繁殖特征的遗传参数
Madeliene L Facy1, Michelle L Hebart1, Helena Oakey2
1Davies Livestock Research Centre, School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA 5371, Australia.
Journal of animal science
|March 13, 2024
概括
养牛健全性评估 (BBSE) 可以提高生育能力. 确定了七个关键的男性生育特征,可以提高牛养殖计划的分娩率和利能力.
科学领域:
- 动物科学动物科学
- 生殖生物学 生殖生物学
- 量化遗传学 量化遗传学
背景情况:
- 男性的生育能力对于牛生产的利能力至关重要,但在养殖计划中经常被忽视.
- 雄牛的低生育率会影响产卵率和经济回报,需要进行专注的研究.
- 牛繁殖健全性评估 (BBSE) 评估男性生育能力,但它们的特征很少被遗传评估或用于选择.
研究的目的:
- 为了基因评估在热带复合牛群中在BBSE期间记录的特征.
- 为了确定特定的男性生育特征,具有足够的遗传性和有利的遗传相关性,以便纳入育种计划.
- 提供数据驱动的方法来提高公牛的生育率和随后的群体生产力.
主要方法:
- 用单变体和双变体线性混合模型分析了BBSE的27个特征.
- 用基因关系矩阵估计遗传参数,包括遗传性和遗传相关性.
- 2,613只动物的基因型定型,并归算为27,638个SNP,利用每种特征的616-826只动物的表型数据.
主要成果:
- 对BBSE特征的遗传概率估计在0.02到0.49之间.
- 七个男性生育特征表明了基因选择的潜力:阴囊周长,正常精子的百分比,近端滴,远端中间体反射,旋的宏体,真空孔/甲状腺体,和护膜得分.
- 这些特征表现出有利的遗传性和遗传相关性,这表明它们可以通过繁殖有效地改善.
结论:
- 将七个已识别的特征纳入牛养殖计划可以显著提高公牛的生育能力.
- 根据这些BBSE特征进行选择,预计将增加生育率,从而提高生产和利能力.
- 这项研究为优化商业牛群中男性生育选择策略提供了基础.
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