与放牧乳牛的核心体温增加相关的行为反应,这些奶牛经历了中度的热应激
A Pontiggia1, A Münger2, L Eggerschwiler2
1Centre for Proper Housing of Ruminants and Pigs, Swiss Federal Food Safety and Veterinary Office, Agroscope, Tänikon 1, 8356 Ettenhausen, Switzerland; Ruminant Nutrition and Emissions, Agroscope, Route de la Tioleyre 4, 1725 Posieux, Switzerland; Veterinary Physiology, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, 3012 Bern, Switzerland.
Animal : an international journal of animal bioscience
|February 24, 2024
概括
乳牛表现出行为变化,如增加呼吸和减少活动,当遇到热压在牧场. 网状体温度 (RET) 可以作为监测放牧奶牛热应激的可靠指标.
科学领域:
- 动物科学动物科学
- 环境生理学环境生理学
- 乳牛管理 乳牛管理
背景情况:
- 放牧的奶牛容易受到环境因素引起的热应激.
- 通过可观察的行为来监测热应激对于动物福利和生产力至关重要.
- 以前用于监测奶牛的热应激的方法在牧场环境中是有限的.
研究的目的:
- 研究牧场奶牛在温带气候下对热量负荷的行为适应.
- 评估网状体温度 (RET) 作为热应激的非侵入性指标的潜力.
- 为了确定与增加热应激水平相关的特定行为变化.
主要方法:
- 在两个夏季,在综合气候指数 (CCI) 定义的不同热量负载下,研究了38只荷尔斯坦乳牛.
- 连续监测阴道温度 (VT) 和网膜温度 (RET).
- 记录了行为数据,包括活动,食,反,呼吸率 (RR) 和水槽附近的位置.
主要成果:
- 网状体温度 (RET) 与阴道温度 (VT) 相似,与综合气候指数 (CCI) 相比,表明其适合用于热应激监测.
- 在高温期间 (1230-1430小时),较高的CCI与平均VT和RET正相关.
- 增加的静脉位与更高的呼吸率 (RR) 和步行,躺着,食和反的时间减少有关.
结论:
- 网状温度 (RET) 是一种可行的方法,用于在放牧奶牛中持续监测热应激.
- 增加呼吸和减少活动等行为变化是牧场上的奶牛热应激的可靠指标.
- 这些发现可以帮助早期检测和管理单个奶牛的热应激.
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