通过丰富具有主导性效应的遗传模型来改善羊群定量特征的遗传评估
Farhad Ghafouri-Kesbi1, Morteza Mokhtari2, Mohsen Gholizadeh3
1Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran. f.ghafouri@basu.ac.ir.
Scientific reports
|August 17, 2025
概括
主导效应显著改善了Baluchi羊生长的遗传模型,增加了诸如出生体重等特征的预测准确度. 包括主导效应在内,提高了附加品种价值的准确性,尽管计算要求更高.
科学领域:
- 定量遗传学 是一种定量遗传学.
- 动物繁殖 动物繁殖
- 羊的遗传学 羊的遗传学
背景情况:
- 定量遗传学研究往往忽略了统治效应,假设添加基因作用.
- 这种监督可能会限制定量特征遗传评估的准确性.
- 了解主导地位对于优化育种计划至关重要.
研究的目的:
- 量化贝鲁奇羊早期生长特征因主导性影响而变化的比例.
- 评估包括主导效应对模型适合性和预测能力的影响.
- 在考虑主导地位时,评估添加品种价值和遗传关联的变化.
主要方法:
- 分析了长达28年的Baluchi羊出生体重 (BW),断奶体重 (WW) 和平均每日增量 (ADG) 的数据.
- 利用了12种动物模型,其中包括各种组合的附加遗传,统治遗传,母系遗传和环境影响.
- 基于Akaike的信息标准 (AIC) 的模型选择;使用预测平均平方误差 (MSE) 和相关性 (r) 评估预测能力.
主要成果:
- 包括主导效应在内的模型显示,所有特征的适应性和预测能力 (较高的r,较低的MSE) 都有所改善.
- 主导遗传变异明显超过了BW,WW和ADG的附加遗传变异.
- 包括主导性效应在内,增加了添加品种值的准确性8-11%,并减少了多达41%的剩余差异.
结论:
- 统治效应在Baluchi羊的早期生长中起着重要作用,对总遗传变异作出了重大贡献.
- 将优势效应纳入遗传评估模型可以提高预测性能和育种值的准确性.
- 尽管计算要求增加了,但为了准确评估Baluchi羊羔生长的基因,建议包括主导效应.
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