在地中海气候下对乳牛的呼吸率进行了全面的研究
Grazyne Tresoldi1, Mina Hejazi2, Cassandra B Tucker3
1Department of Animal Sciences, The Ohio State University, Columbus, 43210; College of Agriculture, California State University, Chico, 95929; Center for Animal Welfare, Department of Animal Science, University of California, Davis, 95616.
Journal of dairy science
|April 11, 2025
概括
牛的呼吸速率 (RR) 受空气温度的显著影响,小牛的呼吸速率增长最为明显. 了解这些变异对于动物福利和动物健康管理至关重要.
科学领域:
- 动物科学动物科学
- 兽医医学 兽医医学 兽医医学
- 环境生理学环境生理学
背景情况:
- 呼吸率 (RR) 是评估牛健康和热压力的关键指标.
- 关于RR如何受到内在和外在因素的影响,有有限的系统数据.
- 准确的RR评估为关键的福利决策提供了信息,例如医疗治疗和冷却策略.
研究的目的:
- 描述不同牛生命阶段 (小牛,母牛,哺乳期,干燥) 的RR.
- 评估天气和热负荷指数作为RR的预测指标.
- 评估个体特征和行为在地中海气候下对RR的影响.
主要方法:
- 在一年内从406只荷尔斯坦和泽西牛群收集了11,210个RR和行为记录.
- 配对的RR数据具有个别特征和25个天气参数.
- 利用描述性统计,混合模型和线性/多项式逻辑回归进行分析.
主要成果:
- 空气温度 (AT) 是最可靠的RR预测指标,解释了35%的变化.
- 牛犊表现出最大的RR增加,随着AT的上升 (+17次呼吸/分钟每10°C).
- 根据生命阶段,品种,姿势,位置,乳产量和妊娠期,RR显著变化.
结论:
- 目前的教科书RR值可能低估了牛的上限值.
- 在地中海气候中,AT是RR变化的主要驱动因素.
- 不同类别的牛群中RR的变化需要进一步研究福利影响.
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