对生长和尸体特征的基因组选择对安格斯牛的足部结构的影响
Zuleica Trujano1, Jorge Hidalgo1, Gopal Gowane1,2
1Department of Animal and Dairy Science, University of Georgia, Athens, GA 30602, USA.
Journal of animal science
|May 4, 2025
概括
对安格斯牛的性能进行基因组选择显示,随着时间的推移,所选特征的遗传能力下降. 脚结构和性能特征之间的遗传相关性仍然接近于零,强调需要多特征选择.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 畜牧养殖 畜牧养殖 畜牧养殖
背景情况:
- 基因组选择提高了准确性,缩短了生成间隔,可能会在性能和较少选择的特征之间产生权衡.
- 了解基因组选择对脚结构的影响对于维持动物福利和育种目标至关重要.
研究的目的:
- 为了评估基因组选择对表现特征对安格斯牛足部结构的影响.
- 通过使用不同的估计方法,检查遗传参数随时间的变化.
主要方法:
- 使用贝叶斯方法 (VCE) 和预测性方法 (PRED) 估计差异组件.
- 对生长,尸体和脚部结构特征的遗传参数 (遗传性和遗传相关性) 的分析.
- 通过使用所有可用的基因型对VCE和PRED的估计结果进行时间比较.
主要成果:
- 一些特征的遗传性随着时间的推移而变化;例如,爪套从0.12增加到0.16,大理石从0.43增加到0.60.
- 随着时间的推移,爪和性能特征 (例如,尸体重量,肋眼区域) 之间的遗传相关性向零转移.
- 预测性方法为年轻动物提供了更新的遗传参数,与VCE相比,性能特征的遗传能力通常较低.
结论:
- 对高度精选的特征的遗传概率估计在最近几代人中下降了.
- 脚结构和性能特征之间的遗传相关性接近于零,这表明对抗性最小.
- 多特征选择对于平衡性能改进与保持理想的形状,包括脚结构,至关重要.
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