增加异构性对北欧乳牛总优点特征的影响:优化交配策略的潜力
L Hein1, J R Thomasen2, M Kargo2
1Aarhus University, Center for Quantitative Genetics and Genomics, 8000 Aarhus, Denmark.
Journal of dairy science
|July 17, 2025
概括
基因组数据通过使用预期异构性 (eHe) 和实现异构性 (rHe) 来提高牛奶产量并减少内生育来改善乳牛的繁殖. 这有助于提高Holstein,红牛乳牛和泽西品种的生产率.
科学领域:
- 动物遗传学动物遗传学
- 乳制品科学 乳制品科学
- 量化遗传学 量化遗传学
背景情况:
- 传统的奶牛交配依赖于血统数据,这可能会限制管理近亲繁殖和异合性交配的准确性.
- 基因组信息提供了一种更精确的方法来估计预期异构性 (eHe) 和实现异构性 (rHe).
- 假设异构性增加可以增强主导效应,并减轻纯种牛的近亲繁殖抑郁症.
研究的目的:
- 使用SNP标记数据估计荷尔斯坦 (HOL),红牛 (RDC) 和泽西 (JER) 品种的eHe和rHe水平.
- 评估增加异构性对关键生产特征 (牛奶,脂肪,蛋白质产量) 和形状/功能特征的影响.
- 评估将基因组异构性估计纳入乳牛育种战略的有效性.
主要方法:
- 计算SNP-by-SNP eHe对父对和全基因组 eHe作为所有SNP的平均异构性.
- 通过追溯五代人的血统亲生繁殖的计算.
- 分析了来自2015-2017年间出生的5,423只HOL,2,245只RDC和5,975只JER母牛的基因型数据,这些母牛的父母具有基因型.
主要成果:
- 平均eHe和rHe水平在所有品种中始终在0.328-0.336左右,有轻微的标准偏差.
- 在所有品种中都观察到eHe,rHe和血统亲属在牛奶,脂肪和蛋白质产量上的显著积极影响.
- 在eHe的1%的增加相当于实质性的产量增加:HOL (125公斤牛奶,2.74公斤脂肪,3.52公斤蛋白质),RDC (100公斤牛奶,2.96公斤脂肪,2.88公斤蛋白质) 和JER (53公斤牛奶,3.63公斤脂肪,2.35公斤蛋白质).
- 虽然eHe对形状和功能特征产生了影响,但意义仅限于这些特征的子集.
结论:
- 基因组对异构性 (eHe和rHe) 的估计显著影响乳牛生产率.
- 将eHe纳入交配决策可以提高不同品种的牛奶,脂肪和蛋白质产量.
- 基因组选择策略应考虑eHe以优化繁殖目标并提高整体群体表现.
关键词:
乳牛牛奶牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛异构性异构性是指异构性.亲生繁殖是一种繁殖方式.结合的决定 结合的决定现型表现表现表现的表现.更多相关视频
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