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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0743    [Accepted] Published online January 4, 2019.
A review of the Effects of heat stress on body temperature, milk production, and reproduction in dairy cows: a novel idea for monitoring and evaluation of heat stress
Jiang Jing Liu1,2,*, Lanqi Li1, Xiaoli Chen1, Yongqiang Lu3, Dong Wang1
1Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
2College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
3Animal Husbandry Station of Beijing, Beijing 100107, China
Correspondence:  Jiang Jing Liu, Tel: +82-01062879492, Fax: +82-01062879492, Email: ssqljj669@126.com
Received: 27 September 2018   • Revised: 18 December 2018   • Accepted: 29 December 2018
Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows. Although THI is an important environmental index and can help to infer the degree of heat stress, it does not reflect the physiological changes experienced by dairy cows undergoing heat stress. However, the simultaneous measurement of THI and physiological indexes (e.g., body temperature) would be very useful for improving dairy production. The successful development of automatic detection techniques makes it possible to combine THI with other physiological indexes (i.e., body temperature and activity), which could help us to comprehensively evaluate heat stress in dairy cows and provide important technical support to effectively prevent heat stress.
Keywords: Body Temperature; Dairy Cows; Heat Stress; THI

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