牛对常见乳制品管理实践的压力反应的比较评估
Katja Koenneker1,2, Martin Schulze1, Laura Pieper1
1Institute for Reproduction of Farm Animals Schönow, 16321 Bernau, Germany.
Animals : an open access journal from MDPI
|July 14, 2023
概括
子修剪和自然繁殖显著增加了奶牛的皮质醇水平,表明与其他常见程序相比,压力反应更大. 牛奶产量不受这些刺激的影响,这表明尽管有生理压力,产量仍然有弹性.
科学领域:
- 动物科学动物科学
- 兽医医学 兽医医学 兽医医学
- 动物生理学 动物生理学
背景情况:
- 乳牛经历各种急性和慢性压力因素.
- 之前关于牛的压力反应的研究由于方法不同而缺乏可比性.
- 了解共同农场程序对牛压力的影响,对于动物福利至关重要.
研究的目的:
- 为了比较评估八种常见刺激对下丘脑-垂体-上腺 (HPA) 轴和牛奶产量的影响.
- 为了评估对人工授精 (AI),胚胎移植 (ET),哺乳 (MM,EM),兽医检查 (VE),超声波 (US),子修剪 (HT) 和自然繁殖 (NB) 的压力反应.
主要方法:
- 24头荷尔斯坦-弗里斯牛被随机分配到对照组和治疗组.
- 血液样本是在相对于刺激应用 (刺激前后) 的五个时间点收集的.
- 测量了血清皮质醇度和每日牛奶产量,以评估HPA轴活动和生产影响.
主要成果:
- 与AI,ET,MM,VE和US相比,子修剪 (HT) 诱导的皮质醇反应显著更高.
- 无论是HT还是自然繁殖 (NB),都导致皮质醇显著增加,在刺激后40分钟内不会恢复到基线水平.
- 在测试的刺激或治疗组中,没有观察到每日牛奶产量的显著差异.
结论:
- 感知到刺激的可控性和可预测性会影响动物的应激反应.
- 涉及增加体力活动,新的社会互动,性兴奋或限制运动的程序可能会增加HPA轴激活.
- 在动物被束时,但在他们的社会群体内进行的治疗可能会导致HPA轴激活的强度较低.
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