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在中国当地的条件下估计Dorper羊在断奶前生长特征的遗传参数

Runjun Wang¹, Xinle Wang¹, Lifei Zhang¹

¹College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China.

Animal bioscience

|November 20, 2025

概括

这项研究估计了中国多珀羊的遗传参数. 断奶前特征的低遗传性表明,为了改进育种策略,应关注断奶时的体重.

科学领域:

动物遗传学和动物繁殖
量化遗传学量化遗传学
畜牧生产系统畜牧生产系统

背景情况:

了解遗传参数对于有效的畜牧养殖计划至关重要.
羊是中国密集农业系统中重要的品种.
对遗传和非遗传因素的准确估计为育种决定提供了信息.

研究的目的:

估计多珀羊的非遗传因素,差异成分和出生体重,断奶体重,平均每日增益和克莱伯比率的遗传参数.
在这个群体中确定最佳的动物模型用于遗传参数估计.
分析关键生长特征之间的遗传和表型相关性.

主要方法:

分析了来自内蒙古 (2019-2021) 的2,022只多珀羊的记录.
通用线性模型 (GLM) 用于评估非遗传影响 (母年龄,性别,出生年月,群体).
使用ASReml的AIREML进行最佳遗传参数估计的六种动物模型的比较;对相关性的双变体模型.

主要成果:

非遗传因素显著影响了所有研究的特征 (P<0.05).
模型2,包括直接的添加基因和母体永久环境影响,是最佳的.
对于出生体重 (0.0215),断奶体重 (0.0287),平均每日增益 (0.0391) 和克莱伯比率 (0.0504) 发现了低遗传率估计.
在断奶体重,平均每日增益和克莱伯比率之间观察到强烈的积极遗传和表型相关性.

结论:

断奶前特征的低遗传性限制了直接选择的有效性.
优先选择断奶体重可以间接改善平均每日增益和克莱伯比率.
这些发现支持在中国的密集型系统中优化多珀羊的养殖策略.

关键词:

这是一只多尔珀绵羊 (dorper sheep).遗传相关性遗传相关性遗传参数遗传参数现型相关性现型相关性断奶前的生长特征断奶前的生长特征

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