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Effect of heat stress on udder health of dairy cows

Published online by Cambridge University Press:  17 September 2020

Md Rezaul Hai Rakib ,
Man Zhou ,
Siyu Xu ,
Yang Liu ,
Muhammad Asfandyar Khan ,
Bo Han  and
Jian Gao
Md Rezaul Hai Rakib
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Man Zhou
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Siyu Xu
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Yang Liu
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Muhammad Asfandyar Khan
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Bo Han*
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
Jian Gao
Affiliation:
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing100193, P. R. China
*
Author for correspondence: Bo Han, Email: hanbo@cau.edu.cn Jian Gao, Email: gaojian2016@cau.edu.cn
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Abstract

This Research Reflection short review presents an overview of the effects of heat stress on dairy cattle udder health and discusses existing heat stress mitigation strategies for a better understanding and identification of appropriate abatement plans for future stress management. Due to high ambient temperatures with high relative humidity in summer, dairy cows respond by changes of physical, biochemical and biological pathways to neutralize heat stress resulting in decreased production performance and poorer immunity resulting in an increased incidence of intramammary infections (IMI) and a higher somatic cell count (SCC). In vitro studies on bovine polymorphonuclear cells (PMN) suggested that heat stress reduces the phagocytosis capacity and oxidative burst of PMN and alters the expression of apoptotic genes and miRNA which, together with having a negative effect on the immune system, may explain the increased susceptibility to IMI. Although there are limited data regarding the incidence rate of clinical mastitis in many countries or regions, knowledge of SCC at the cow or bulk tank level helps encourage farmers to improve herd health and to develop strategies for infection prevention and cure. Therefore, more research into bulk tank SCC and clinical mastitis rates is needed to explain the effect of heat stress on dairy cow udder health and functions that could be influenced by abatement plans.

Keywords

Bulk tank somatic cell countdairy cowsheat stressmastitisudder health
Type
Research Reflection
Information
Journal of Dairy Research , Volume 87 , Issue 3 , August 2020 , pp. 315 - 321
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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