退化的外国育种价值对国内肉牛单步基因组评估的影响
Damilola Adekale1,2, Zengting Liu3, Ross Evans4
1Functional Breeding, Georg-August University, Göttingen, Germany. damilola.adekale@vit.de.
Genetics, selection, evolution : GSE
|July 14, 2025
概括
整合国际估计的繁殖值 (EBV) 有助于改善国家对牛的基因组评估. 矩阵退行方法是混合外国和国内EBV的最佳方法,增强遗传进步.
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:
- 牛养殖中的遗传评估正在从国家到跨国方法过渡.
- 将国际估计育种值 (EBV) 整合到国家基因组评估中,由于方法和数据不同,造成了挑战.
- 本研究使用单步基因组评估来解决德国肉牛中的这些挑战.
研究的目的:
- 评估国际EBV与德国肉牛国家EBV混合的影响.
- 为了比较三个回归方法:标量 (加里克,范拉登) 和矩阵.
- 评估国家与混合EBV的准确性,分散性和水平偏差.
主要方法:
- 使用了Angus,Charolais,Limousin和Simmental品种的国家表型数据 (2022年12月).
- 从Interbeef评估 (2023年1月) 中纳入的国际EBV.
- 采用前验证研究,将纯粹的国家评估与使用三种退行方法的混合单步基因组评估进行比较.
主要成果:
- 与国际数据混合的EBV显示出更高的准确性和更低的分散偏差,特别是在200天体重直接和母体影响方面.
- 矩阵退行方法表现出优异的性能,退行EBV和表型衍生EBV之间存在高相关性 (>0.99).
- 整合外国数据改善了基因组估计育种值 (GEBVs) 与截断的评估的相关性.
结论:
- 准确整合外国EBV对于加强国家基因组评估和加速畜牧业遗传收益至关重要.
- 矩阵方法来缓解EBV的退化在各种品种和特征中是最佳的.
- 范拉登 (VR) 退化方法在矩阵退化技术上具有挑战性时提供了一个可行的替代方案.
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