Review of the impact of heat stress on reproductive performance of sheep

作     者：William H.E.J.van Wettere Karen L.Kind Kathryn L.Gatford Alyce M.Swinbourne Stephan T.Leu Peter T.Hayman Jennifer M.Kelly Alice C.Weaver David O.Kleemann Simon K.Walker William H.E.J.van Wettere;Karen L.Kind;Kathryn L.Gatford;Alyce M.Swinbourne;Stephan T.Leu;Peter T.Hayman;Jennifer M.Kelly;Alice C.Weaver;David O.Kleemann;Simon K.Walker

作者机构：The University of AdelaideSchool of Animal and Veterinary SciencesDavies Livestock Research CentreRoseworthy CampusMudla Wirra RdRoseworthySouth Australia 5371Australia The University of AdelaideRobinson Research InstituteAdelaide Medical SchoolNorth TerraceAdelaideSouth Australia 5000Australia The University of AdelaideSchool of AgricultureFood and WineWaite Research InstituteUrrbraeSouth Australia 5064Australia South Australian Research and Development InstitutePrimary Industries and Regions SAGovernment of South AustraliaClimate ApplicationsWaite Research PrecinctUrrbraeSouth Australia 5064Australia South Australian Research and Development InstitutePrimary Industries and Regions SAReproductive BiologyLivestock SciencesTurretfield Research Centre129 Holland RdRosedaleSouth Australia 5350Australia 

出 版 物：《Journal of Animal Science and Biotechnology》 (畜牧与生物技术杂志（英文版）)

年 卷 期：2021年第12卷第3期

页      面：859-876页

核心收录：

学科分类：0905[农学-畜牧学] 09[农学] 

基　　金：This review was funded as part of a Meat&Livestock Australia Ltd.tender entitled The effects of heat stress and predicted climate change scenarios on reproductive performance of the Australia sheep flock(Project code:L.LSM.0024) 

主　　题：Fertility Heat stress Oogenesis Pregnancy Sheep Spermatogenesis 

摘      要：Heat stress significantly impairs reproduction of sheep,and under current climatic conditions is a significant risk to the efficiency of the meat and wool production,with the impact increasing as global temperatures *** from field studies and studies conducted using environmental chambers demonstrate the effects of hot temperatures(≥32℃)on components of ewe fertility(oestrus,fertilisation,embryo survival and lambing)are most destructive when experienced from 5 d before until 5 d after *** controlled studies also demonstrate that ram fertility,as measured by rates of fertilisation and embryo survival,is reduced when mating occurs during the period 14 to 50 d ***,the contribution of the ram to heat induced reductions in flock fertility is difficult to determine *** primarily on temperature controlled studies,it is clear that sustained exposure to high temperatures(≥32℃)during pregnancy reduces lamb birthweight and will,therefore,decrease lamb survival under field *** is concluded that both ewe and ram reproduction is affected by relatively modest levels of heat stress(≥32℃)and this is a concern given that a significant proportion of the global sheep population experiences heat stress of this magnitude around mating and during *** this,strategies to limit the impacts of the climate on the homeothermy,behaviour,resource use and reproduction of extensively grazed sheep are limited,and there is an urgency to improve knowledge and to develop husbandry practices to limit these impacts.