热量负荷对北方温带牧场系统肉牛活动预算的影响
Temitope O Oloyede1, Francisco J Novais1, Carolyn J Fitzsimmons1,2
1Department of Agricultural, Food and Nutritional Science, Faculty of Agricultural, Life and Environmental Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada.
International journal of biometeorology
|March 10, 2025
概括
气温上升会影响牲畜的行为,将活动模式转移到较冷的时期. 了解这些热负荷值对于在气候变化中进行畜牧管理至关重要.
科学领域:
- 动物科学动物科学
- 适应气候变化 适应气候变化
- 行为生态学 行为生态学
背景情况:
- 由于气温上升,全球变暖对畜牧业生产构成风险.
- 热应激对牧场环境中的牛行为的影响需要进一步调查.
研究的目的:
- 调查夏季和秋季放牧季节的肉牛活动模式 (步数,躺时间).
- 确定影响北方温带牧场牛群行为的温度湿度指数 (THI) 值.
主要方法:
- 在2021年6月至11月期间,使用腿部安装的计步器对肉牛母牛和带小牛的奶牛进行测量.
- 使用温度湿度指数 (THI) 量化热负荷.
- 对THI进行活动数据分析,以确定行为反应.
主要成果:
- 在高热量负荷期间,牛在活动中表现出白天变化,在晚上和中午增加了运动.
- 雌牛在夏天表现出更高的活动,而奶牛在秋天更活跃,休息更少.
- 特定的THI值为54和70被确定为改变牛的移动率.
结论:
- 升高的热量负荷显著改变肉牛活动模式和昼间节律.
- 奶牛和母牛表现出不同的热应激行为调整.
- 结果为管理与气候变化相关的热应激条件下的牛行为和福利提供了洞察力.
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