在肉遗传评估模型中对直接母性遗传和环境共差的估计和后果
Hélène Romé1, Thinh T Chu2,3, Danye Marois4
1Center for Quantitative Genetics and Genomics, Aarhus University, 8830, Tjele, Denmark. helene.rome@qgg.au.dk.
Genetics, selection, evolution : GSE
|August 7, 2023
概括
孕产妇的影响会影响肉的生长. 在育种价值预测模型中考虑遗传和环境直接母性共变性,可以提高准确性,降低通货膨胀,增强肉遗传选择.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 动物育种 动物育种
背景情况:
- 母亲的影响显著影响幼肉的特征,如体重和生长.
- 忽视育种价值预测中的母性影响导致精度降低和估计膨胀.
- 直接的母性遗传和环境共差可以改善预测模型.
研究的目的:
- 测试包括直接母性遗传和环境共变性增加准确性和限制预测 brojlers 的繁殖值的通货膨胀的假设.
- 应用一个考虑两种共差的模型来估计大量肉种群中的繁殖值.
主要方法:
- 应用了一个包含直接母性遗传共变性和直接母性环境共变性的模型.
- 该模型在模拟的肉种群上进行了测试,并在41个选择轮中在商业肉生产线上得到了验证.
- 使用交叉验证评估预测能力,将准确性定义为预测和真实育种值之间的相关性.
主要成果:
- 直接母性遗传共变是负的;直接母性环境共变是正的.
- 包括环境共变量 (带或不带遗传共变量) 改善了真实数据的准确性和减少了通缩.
- 在模拟数据中,将两种共差计算在内,可以降低通货膨胀,并提高准确度高达6%.
结论:
- 建议使用标准REML软件进行简单的方法来估计使用标准REML软件的环境直接母体共变量.
- 观察到母体和后代之间的积极环境共变性和负遗传共变性.
- 在遗传评估模型中将直接的母性遗传和环境共变性纳入,可以提高预测的繁殖值的准确性.
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