肠道甲特征的遗传参数及其与丹麦霍尔斯坦牛牛奶生产的遗传联系
Helen Schneider1, Rikke Krogh Lajevardi1, Martin Bjerring2
1Center for Quantitative Genetics and Genomics, Aarhus University, DK 8800 Aarhus C, Denmark.
Journal of dairy science
|September 13, 2025
概括
为了减少甲 (CH4) 排放,养殖牛对于减少温室气体的排放至关重要. 这项研究发现,较高的牛奶产量与增加的CH4排放之间存在遗传联系,这表明需要新的育种策略.
科学领域:
- 动物育种与遗传学
- 环境科学 环境科学
- 乳制品科学 乳制品科学
背景情况:
- 牛产生的甲 (CH4) 排放对人为的温室气体有很大贡献.
- 将CH4排放纳入养殖目标提供了一种长期减排的可持续方法.
- 了解CH4特征的遗传结构及其与生产特征的关系对于有效的育种计划至关重要.
研究的目的:
- 分析CH4特征 (呼吸中的CH4和CO2度,以及它们的比率) 以及它们与丹麦霍尔斯坦牛的牛奶生产特征的遗传相关性.
- 为了区分生长 (原生,PP) 和成年 (多生,MLP) 奶牛之间的遗传参数.
- 为设计可持续乳牛养殖的选择指数提供信息.
主要方法:
- 利用了4019头丹麦荷尔斯坦牛的数据集,每天进行了587640次观察.
- 使用农场安装的嗅探器测量牛的呼吸中的CH4和CO2度.
- 应用了基于血统的单一和双变的可重复性线性动物模型来估计遗传性和遗传相关性.
主要成果:
- 对于CH4特征的遗传性在0.08到0.19之间.
- 重复性在0.13和0.42之间.
- CH4特征和牛奶生产特征 (例如,能量校正牛奶 - ECM) 之间的遗传相关性中等至高,不利 (例如,MLP奶牛中CH4_C和ECM之间的0.44),表明增加的排放与更高的牛奶产量.
结论:
- 证实了牛奶生产和CH4排放之间存在不利的遗传关系.
- 强调需要进一步研究,以开发基因独立于牛奶生产的CH4特征.
- 强调研究调解因素 (例如料摄入) 的重要性,以更好地了解遗传相关性,并优化育种策略,以减少CH4排放,而不影响牛奶生产.
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