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首页> 外文期刊>Turkish Journal of Veterinary and Animal Sciences >Thermoregulation differs in Chinampo (Bos taurus) and locally born dairy cattle.
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Thermoregulation differs in Chinampo (Bos taurus) and locally born dairy cattle.

机译：温度调节在Chinampo（ Bos taurus ）和本地出生的奶牛中有所不同。

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摘要

The study was conducted to evaluate the heat tolerance, physiological constants, of 32 dairy cows (Chinampo, n=12; Holstein, n=10 and Jersey, n=10) in an arid region of northwest Mexico. Rectal temperature and respiratory rate were recorded every Monday at 06:00 and 17:00 h between June and December 2006. Results revealed that the rectal temperature of Holstein was highly affected by heat, followed by Jersey and Chinampo (the most heat-resistant). Respiratory rate of the three breeds was affected by climatic factors, but the Holstein and Jersey cows registered higher values than Chinampo cows. The physiological variables of all three breeds increased with a temperature-humidity index (THI) of >72. The most heat accumulation during the day was registered in the dairy breeds. The difference in respiratory rate between morning and evening measurements were higher in Holstein and Jersey cows than in Chinampo cows. It is concluded that Chinampo cows are the most tolerant to heat stress.
机译：该研究旨在评估墨西哥西北部干旱地区的32头奶牛（Chinampo，n = 12; Holstein，n = 10，Jersey，n = 10）的耐热性和生理常数。在2006年6月至12月的每个星期一的06:00和17:00 h记录直肠温度和呼吸频率。结果显示，荷斯坦的直肠温度受热的影响最大，其次是泽西岛和Chinampo（耐热性最高） 。这三个品种的呼吸速率受气候因素的影响，但荷斯坦奶牛和泽西奶牛的呼吸值高于中国奶牛。这三个品种的生理变量均以> 72的温度-湿度指数（THI）增加。白天，热量积累最多的是奶牛品种。荷斯坦奶牛和泽西奶牛的早晚呼吸频率差异要高于Chinampo奶牛。结论是，Chinampo母牛最耐高温。

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