杂交的Bos indicus奶牛在分娩时的气质的遗传评估
María F Munguía Vásquez1, Clare A Gill1, Penny K Riggs1
1Department of Animal Science, Texas A&M University, 2471 TAMU, College Station, TX 77843, USA, david.riley@ag.tamu.edu, +1 (979) 845-2667.
Journal of animal science
|January 29, 2024
概括
牛的气质,是对侵略性的衡量标准,具有较低的遗传性. 不那么积极的奶牛可能表现出较低的生殖和孕产妇表现,学会的行为影响气质.
科学领域:
- 动物遗传学动物遗传学
- 行为科学 行为科学
- 生殖生物学 生殖生物学
背景情况:
- 牛在分娩时的气质往往表明其具有侵略性.
- 之前的研究报告说,Bos taurus品种的牛气质具有较低的遗传性.
- 了解气质遗传性及其影响对于肉牛管理至关重要.
研究的目的:
- 估计在Bos indicus杂交动物分娩时牛气质的遗传性.
- 进行全基因组的牛气的关联分析.
- 评估分娩气质,生产能力和生命早期气质之间的关系.
主要方法:
- 在4337次分娩期间 (2005-2022年) 对937头母牛的气质得分从1 (顺从) 到5 (侵略) 之间.
- 估计了遗传性,重复性和遗传/环境成分.
- 进行了全基因组关联分析 (GWAS),并计算了与性能特征的相关性.
主要成果:
- 对气质的遗传性和重复性估计分别为0.12 ± 0.024和0.24 ± 0.018.
- 气质得分显示了与早期生活气质和生殖/孕产妇表现特征 (分娩率,断奶率,断奶体重) 的低至中等正相关性.
- 在BTA 4上有两个SNP与终身最大气得分相关;母亲的影响可能会影响气.
结论:
- 牛在分娩时的气质具有较低的遗传性,但具有显著的重复性,受到母亲因素的影响,可能是通过学习的行为.
- 奶牛在分娩时的攻击性较低可能与生殖和孕产妇成功的减少有关.
- 管理策略应该考虑遗传学,环境和牛气质学习行为的复杂相互作用.
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