线粒体功能和营养分离在高和低料效率的多卵性荷尔斯坦乳牛中
Sophia J Kendall1, Guillermo Martinez-Boggio1, Usman Arshad2
1University of Wisconsin-Madison, Madison, WI.
Journal of dairy science
|November 26, 2025
概括
具有更高料效率的奶牛 (负剩余料摄入量; -RFI) 的甲和二氧化碳排放量较低. 线粒体功能的差异,而不是肝脏基因表达,解释了料效率的变化.
科学领域:
- 动物科学动物科学
- 营养生物化学 营养生物化学
- 代谢调节 代谢调节 代谢调节
背景情况:
- 剩余料摄入量 (RFI) 是评估牲畜料效率的一个关键指标.
- 识别具有不同RFI (高与低料效率) 的动物对于优化动物生产和可持续性至关重要.
- 了解RFI变化的生理基础可以导致有针对性的育种和管理策略.
研究的目的:
- 为了研究不同RFI的奶牛之间的代谢物,激素,脂肪酸,肝脏基因表达和线粒体功能的差异.
- 量化和比较牛的甲 (CH4),二氧化碳 (CO2) 和氧气 (O2) 消耗和排放,用对比的 RFI.
- 阐明导致乳牛料效率差异的代谢和生理因素.
主要方法:
- 两项为期8周的试验,每项试验涉及64头荷尔斯坦乳牛,以测量摄入量,体重和牛奶产量.
- 从尾部血管和乳腺静脉中分析血液代谢物,激素和脂肪酸.
- 测量肝脏基因表达,线粒体功能 (氧气消耗率) 和气体交换 (CH4,CO2,O2).
主要成果:
- 与阳性RFI (+RFI) 牛相比,负RFI (-RFI) 牛的乳糖百分比较高,MUN和SCS较低.
- 特定脂肪酸 (例如,C16:0,C18:0) 和胰岛素度在RFI奶牛的尾血管血液中较高.
- 线粒体复合体IV在RFI奶牛中显示出较低的氧气消耗率,这些奶牛的CH4和CO2排放量较低,尽管与解,线粒体或TCA周期相关的肝脏基因表达相似.
结论:
- 乳牛的不同RFI状态与血液代谢物,脂肪酸和胰岛素的不同模式有关.
- 肝脏线粒体功能的差异,特别是氧气消耗,与料效率的变化有关.
- 较低的甲和二氧化碳排放被观察到更高料效率 (-RFI) 的奶牛中,这表明潜在的环境效益,变异主要是由线粒体功能而不是肝脏基因表达驱动的.
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