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对美国卡塔丁羊的母羊长寿指标的遗传参数和遗传趋势的估计

Luis F B Pinto^1,2, Ronald M Lewis³, Artur O Rocha²

¹Department of Animal Science, Federal University of Bahia, Salvador, BA, Brazil.

Journal of animal science

|April 18, 2025

概括

直接的遗传选择可以提高羊群的利能力和动物福利. 这项研究估计了卡塔丁羊的8种长寿特征的遗传参数,并建议将它们纳入选择目标.

科学领域:

动物遗传学动物遗传学
羊的繁殖羊的繁殖
量化遗传学量化遗传学

背景情况:

为了增加母羊的寿命,直接基因选择可以提高羊群的利能力和动物福利.
目前,国家绵羊改良计划 (NSIP) 并没有对长寿指标特征进行评估.

研究的目的:

估计美国卡塔丁羊群中8种长寿指标特征的遗传参数.
评估基因组数据在预测长寿特征的繁殖值方面的有效性.

主要方法:

使用了AIREML方法,动物模型包含了血统 (A) 或混合血统和基因组 (H) 关系矩阵.
包括来自10,032个基因型动物的基因组信息.
作为固定效应,适合第一个羔羊的年龄和生育类型,同时代组作为固定或随机效应.

主要成果:

在准确性方面,H矩阵 (混合血统和基因组) 超过了A矩阵 (仅为血统).
将当代组作为随机效应,产生了更高的平均准确度值.
长寿特征的遗传概率估计在0.06 (TLWadj) 到0.15 (TLB) 之间.
长寿特征之间的遗传和表型相关性很高 (>0.80).
对所有特征都观察到显著的积极遗传趋势,但尚未明显显著的遗传收益.

结论:

基因组选择为估计长寿特征的繁殖值提供了更高的准确性.
长寿特征表现出有利的遗传关联和积极的趋势,表明遗传改进的潜力.
建议将长寿纳入美国卡塔丁羊的选择目标,以提高羊群的表现和福利.

关键词:

没有长寿的长寿.遗传预测遗传预测羊类羊类羊类羊类参数估计的参数估计.生产性生活生产性生活

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