Bell Veterinary Services, 49-53 Dennis Street, Queensland 4408, Australia.
Mader Consulting LLC, 9301 Valaretta Drive, Gretna, NE 68028, USA.
Vet Clin North Am Food Anim Pract. 2018 Jul;34(2):325-339. doi: 10.1016/j.cvfa.2018.05.001.
Feedlot cattle consuming large amounts of feed and gaining weight rapidly generate significant amounts of metabolic heat. In summer, failure to dissipate this heat leads to heat accumulation and heat stress. Respiratory rates, panting scores, and behavioral changes are useful indicators of heat stress in cattle. Ceasing cattle movement, providing supplementary water tanks in the pens, cooling the pen surface, and manipulation of nutrition and feeding management should be considered to mitigate the risk and manage a heat stress crisis. Removing manure from the pens and provisions of shade has been found to be beneficial for cattle exposed to hot climates.
饲养场的牛大量食用饲料并迅速增加体重，会产生大量代谢热。在夏季，如果不能散发这些热量，就会导致热量积聚和热应激。呼吸频率、喘气评分和行为变化是牛热应激的有用指标。应考虑停止牛的移动、在畜栏中提供补充水箱、冷却畜栏表面以及调整营养和饲养管理，以降低风险并应对热应激危机。已经发现，从畜栏中清除粪便和提供阴凉处对暴露在炎热气候下的牛是有益的。
