在多品种肉牛种群中对生产寿命的遗传评估
Tiago Luciano Passafaro1, Yeni Liliana Bernal Rubio1, Natascha Vukasinovic1
1Zoetis Inc, Livestock Genetics and Precision Animal Health VMRD, Kalamazoo, MI 49007, USA.
Journal of animal science
|December 3, 2024
概括
肉牛的生产寿命 (PL) 可以通过遗传选择来预测. 这项研究开发了一个模型来估计PL的育种价值,表明早期的绩效记录是未来成功的良好指标,使得更有利可图的育种决策成为可能.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 牛肉牛生产 牛肉牛生产
背景情况:
- 肉牛牛犊作业的经济成功取决于有利可图的特征的遗传选择.
- 生产寿命 (PL),结合牛的寿命和生殖性能,是利能力的一个关键特征.
研究的目的:
- 开发一种数据选策略和统计模型,用于预测多品种肉牛种群在生产寿命 (PL) 中的遗传优点.
- 评估不同统计模型 (可重复性和随机回归) 的有效性,以估计PL的繁殖值.
主要方法:
- 利用了包括血统,表型和基因型信息在内的大量数据集,来自多品种肉牛种群.
- 安装了可重复性模型 (REP) 和随机回归模型 (RRM),结合了各种系统和随机效应.
- 使用单步 GBLUP (ssGBLUP) 来获得估计的繁殖值 (EBV) 和线性回归用于转换.
主要成果:
- 对PL的遗传概率估计较低 (0.109对REP,从0.16降至0.04对RRM),表明环境影响很大.
- 对于PL的重复性是中度的 (0.415对于REP,0.29-0.57对于RRM).
- 可重复性模型 (REP) 在趋同时间和代方面比随机回归模型 (RRM) 更有效.
- 验证显示,随着时间的推移,EBV和表型之间的相关性越来越大 (0.04到0.92).
结论:
- 尽管遗传性低,但长期对PL的遗传选择可以在肉牛中有效.
- 牛的第一个表现记录 (第二平价) 是后续生产寿命的可靠预测指标.
- 将PL整合到多品种遗传评估和选择索引中可以提高牛肉群的利能力.
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