Impact of prenatal heat tolerance in holstein dry cows on their calves' thermoregulation and immunity

文献类型： 外文期刊

第一作者： Chen, Xiaoyang

作者： Chen, Xiaoyang;Li, Chenyang;Fang, Tingting;Gu, Xianhong;Chen, Xiaoyang;Yao, Junhu

作者机构：

关键词： Heat-tolerant; Heat-sensitive; Dry cows; Calf; Thermoregulation; Immunity

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.9； 五年影响因子：3.2 ）

ISSN： 0306-4565

年卷期： 2025 年 127 卷

页码：

收录情况： SCI

摘要： This study examines the impact of Holstein dry cows' prenatal heat tolerance (n = 180) on their calves' thermoregulation and immunity. Holstein cows (body condition score 3.29 +/- 0.39, parity 2.64 +/- 0.79) were monitored for body temperature (BT), respiratory rate (RR), and microenvironmental temperature and humidity twice daily for seven days during heat stress. Mixed-effects model and cluster method identified heat-tolerant (n = 68) and heat-sensitive (n = 114) dry cows. Once cows gave birth, the RR and BT of 2-day-old calves were recorded every 2 h for two days, totaling five measurements per day, to assess thermoregulatory responses using generalized linear mixed models. Calves in the heat-tolerant group had a better thermoregulatory response than the heat-sensitive group, RR of heat-tolerant calves was significantly higher than the heat-sensitive calves (P = 0.02). Plasma indicators were analyzed to assess calf immunity. Heat-tolerant calves had significantly lower plasma cortisol, tumor necrosis factor-alpha, interleukin 2, interleukin 4, interleukin 6, and interleukin 10 concentrations compared to heat-sensitive calves (P < 0.05). In both cows and calves, plasma cortisol concentrations in the heat-tolerant groups were lower than those in heat-sensitive groups. In comparison, plasma heat shock protein 70 and heat shock protein 90 concentrations were higher (P < 0.05). In conclusion, calves born to heat-tolerant cows had higher thermoregulation and immunity than calves born to heat-sensitive cows when exposed to heat stress.

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