热应激增加了肠道甲排放的产量和强度,同时损害了哺乳乳乳牛的乳头功能和生产力
D Onan-Martinez1, M A T de Bari1, H Olmo1
1Department of Animal Sciences, University of Florida, Gainesville, FL.
Journal of dairy science
|February 16, 2026
概括
奶牛的热应激 (HS) 会减少干物质的摄入量和牛奶的产量. 然而,高温增长甲 (CH4) 产量和强度,对环境足迹和生产效率产生负面影响.
科学领域:
- 动物科学动物科学
- 环境科学 环境科学
- 农业科学 农业科学
背景情况:
- 畜牧业的排放,特别是肠道甲 (CH4),对全球变暖作出了重大贡献.
- 已知热应激 (HS) 会降低奶牛的生产力,但其对CH4排放的确切影响尚不清楚.
研究的目的:
- 为了研究热应激对哺乳乳奶牛CH4排放强度的影响.
- 为了确定热应激如何影响干物质摄入量 (DMI),牛奶产量和小肠功能.
主要方法:
- 40只正在哺乳的荷尔斯坦牛接受了为期4周的交叉设计,其中有缓解热应激 (冷却) 和不冷却的时期.
- 干物摄入量 (DMI),肠道气体排放 (使用GreenFeed系统),反,反 pH,温度和运动性 (通过SmaXtec螺栓) 被监测.
- 在整个研究过程中,记录了环境条件,包括温度湿度指数.
主要成果:
- 热应激显著降低了DMI,反时间,反 pH 和动力,同时增加了反温度.
- 在热应激条件下,牛奶产量和能量校正牛奶 (ECM) 减少.
- 每日CH4排放量下降,但CH4产量和强度 (分别为g/kg DMI和g/kg ECM) 在热应力下显著增加.
结论:
- 热应激会对奶牛的生产力和功能产生负面影响.
- 在热应激期间增加的CH4产量和强度表明每个生产单位的环境足迹更大.
- 管理热应激对于改善畜牧业的动物福利,生产效率和环境可持续性至关重要.
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