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牛奶中红外基因参数的估计预测了霍尔斯坦乳牛的甲产量

Saeed Shadpour¹, Allison Fleming², Christine F Baes¹

¹Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.

Journal of dairy science

|November 26, 2025

概括

奶牛的甲产量是适度遗传的,为减少排放提供了遗传选择的潜力. 然而,在选择更低的甲产量时,育种者应该考虑与脂肪产量的不利遗传相关性.

科学领域:

动物科学动物科学
环境科学环境科学
遗传学是一个遗传学.

背景情况:

畜牧业的甲排放对全球温室气体排放有很大贡献 (18%).
将甲生产纳入养殖目标是可持续畜牧系统的关键.
直接测量甲是具有挑战性的,需要像预测甲生产这样的替代方法.

研究的目的:

为了估计牛奶的遗传参数,中红外线预测甲产量 (PCH4).
确定PCH4和关键生产特征 (牛奶,脂肪和蛋白质产量) 之间的遗传相关性.
评估PCH4在加拿大荷尔斯坦乳牛中的遗传选择潜力.

主要方法:

对37,202个PCH4记录和相应的测试日生产记录 (MY,FY,PY) 的分析.
数据收集了来自18,505头哺乳期加拿大荷尔斯坦奶牛 (119-179 DIM) 的100个群体的数据.
使用Legendre多项式的单特征和双特征随机回归模型的评估.

主要成果:

PCH4的遗传性中度高,在0.37到0.45.5之间.
PCH4与MY,FY和PY之间的遗传相关性低至中等 (-0.23至0.48).
在PCH4和脂肪产量之间观察到正面,不利的遗传相关性.

结论:

牛奶预测的甲产量 (PCH4) 是一种适度遗传的特征.
PCH4可用于基因选择,以减轻乳牛的甲排放.
在选过程中,必须仔细考虑与脂肪产量的遗传相关性,以保持生产力.

关键词:

CH(4) 的生产生产.乳牛牛奶牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛奶MIR数据牛奶MIR数据随机回归模型是一个随机回归模型.

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