在加拿大霍尔斯泰因中,异位距离作为遗传选择特征的潜力
G R Dodd1, F S Schenkel1, F Miglior2
1Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada N1G 2W1.
Journal of dairy science
|March 26, 2025
概括
阳系距离 (AGD) 显示出作为乳牛生育特征的潜力,基因组选择提高了育种价值的可靠性. 然而,AGD可能与生产特征有不利的联系,需要平衡的育种方法.
科学领域:
- 动物遗传学动物遗传学
- 生殖生物学 生殖生物学
- 乳制品科学 乳制品科学
背景情况:
- 乳牛的生育率是一个全球性的挑战,经常通过基因选择指标特征来解决.
- 目前的生育特征受到环境因素的高度影响,限制了遗传改进.
- 异位距离 (AGD) 是一种新的特征,由于更高的遗传性和有利的生殖关联,它有可能提高生育能力.
研究的目的:
- 为了估计加拿大Holsteins的异位距离 (AGD) 的遗传参数.
- 用血统和基因组方法评估AGD的育种价值的可靠性.
- 评估AGD繁殖值与其他重要的乳牛特征之间的相关性.
主要方法:
- 利用了4988只加拿大荷尔斯坦牛和公牛具有AGD表型的数据集.
- 使用基于血统和单步基因组BLUP (ssGBLUP) 来估计AGD的遗传性.
- 评估育种价值可靠性和比较预测方法,包括交叉验证.
主要成果:
- 基于祖先的AGD遗传率为0.39 ± 0.04;ssGBLUP产生了0.37 ± 0.03.
- 基因组信息显著提高了育种价值的可靠性,特别是对于未经证实的动物.
- AGD的育种价值与首次服役时的年龄和生产特征有中度不利的相关性.
结论:
- 阳系距离 (AGD) 是一种遗传性特征,具有乳牛遗传选择的潜力.
- 基因组选择提高了AGD育种值的准确性.
- 需要平衡的育种策略来缓解AGD和生产特征之间的潜在负面关联.
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