牛肉公牛与奶牛交配后的后代的尸体特征的遗传参数
John W Keele1, Blake A Foraker2, Ryan Boldt3
1U. S. Meat Animal Research Center, Clay Center, NE 68933, USA.
Journal of animal science
|March 15, 2024
概括
采摘前的特征和基因型可以提高肉牛种子库估计育种值 (EBV) 的准确性. 虽然无表型动物的准确性最初很低,但随着基因组数据和尸体信息的增加,它会增加,有助于对经济上重要的特征进行选择.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 基因组选择 基因组选择
背景情况:
- 估计的繁殖值 (EBV) 对于肉牛的遗传选择至关重要.
- 将基因组数据与传统的表型集成,可以提高EBV的准确性.
- 了解活体动物和尸体特征之间的遗传关联对于高效的育种计划至关重要.
研究的目的:
- 评估预收割指标特征和基因型对牛肉 × 乳制品杂交牛的EBV准确性的影响.
- 评估EBV对种子候选物的准确性,特别是那些没有直接表型数据的种子.
- 探索活体动物和收获后尸体特征之间的遗传相关性.
主要方法:
- 基因定型2632个纯种和杂种种苗动物,用于10万个单核酸多态.
- 估计了3,247只动物的基因组关系矩阵,包括表型和非表型个体.
- 计算37个特征的遗传参数,使用有限的最大概率分析和EBVs,使用最好的线性无偏预测进行大理石化.
主要成果:
- 对于 EBV 标记的准确性在有记录数据的动物中为 0.64 到 0.80,没有记录数据的动物中为 0.09 到 0.60.
- 在活体动物特征 (框架尺寸,体重,超声波脂肪厚度/眼区域) 和收获后尸体特征 (HCW,眼区域,产量等级,脂肪厚度,大理石化) 之间发现了显著的遗传相关性,范围从-0.53到0.95.
- 对非表型动物的准确性受到其与表型动物的基因组关系的影响,与理论预期保持一致.
结论:
- 收获前的活体动物特征是经济上重要的尸体特征的有价值的预测因素.
- 基因组关系是提高EBV准确性在非表型种子候选人的关键.
- 基因型和尸体数据的添加预计将进一步提高牛肉 × 乳制品杂交种群的EBV准确性.
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