2009•Hubei nongye kexueRequires access

Influence of Heat Stress on Physiological Response of Holstein Cows

Li Wang

Abstract

48 Holstein cows were used in the present study to examine the influence of heat stress on physiological response of dairy cows,which had identical body weight,parities and milk yield under different temperature-humidity index(THI).The results showed that the rectal temperature and respiratory rate of dairy cattle under heat stress in summer were significantly higher than those in winter(P0.01).Heat stress could raise the rectal temperature and respiratory rate of dairy cattle.

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Key concepts: Heat stress, Heat index, Rectal temperature, Animal science, Dairy cattle, Respiratory rate, Fight-or-flight response, Biology