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Updated: Jun 5, 2025

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工具来完善未知母组定义的工具

A Legarra¹, I Aguilar²

¹Council on Dairy Cattle Breeding, Bowie, MD 20716; Department of Animal and Dairy Science, University of Georgia, Athens, GA 30602.

Journal of dairy science

|December 11, 2024

概括

本研究引入了新的方法,通过定义形成UPG的规则来改进遗传评估中的未知父组 (UPG) 模型. 加入UPG提高了健康特征的准确性,但对产量特征的影响最小.

科学领域:

动物育种与遗传学
量化遗传学量化遗传学
统计遗传学统计遗传学

背景情况:

在遗传评估中,未知父母组 (UPG) 可能导致缺失父母身份,影响准确性.
形成UPG需要有系统的规则,特别是随着日益复杂的遗传评估.
准确的UPG形成对于可靠的遗传评估和育种价值估计至关重要.

研究的目的:

开发和评估定义规则的方法,以组建未知母组 (UPG).
确定信息性,并加入在品种和途径内连续的UPG,以改进遗传评估.
使用简化模型估计UPG之间的对比的精度.

主要方法:

从后代传播到祖先的记录分数,以计算伪计数.
实施两种加入UPG的规则:在时间上向前,直到记录出现,向后到最小的伪计数.
使用简化模型估计UPG之间的对比的精度.
将方法应用于美国传统BLUP对产量和健康特征的评估.

主要成果:

加入UPG显著影响了基因趋势和健康特征的估计育种值,特别是在小型品种中.
对于产量特征,加入UPG对估计的繁殖值和遗传趋势的影响很小,伪记录数量很高.
对于UPG,拟议的连接策略提高了准确性,以较低的标准误差显示对比度.
对于大型数据集来说,计算是可行的.

结论:

开发的方法为形成UPG提供了系统的规则,提高了遗传评估的准确性.
加入UPG对健康等特征特别有益,特别是在较小的品种中.
这些发现表明,精细的UPG定义对于准确的遗传趋势和育种价值估计的重要性.

关键词:

准确度准确度准确度准确度准确度品种品种品种品种基因组基因组基因组基因组缺失的血统遗迹缺失的血统遗迹

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