Subacute ruminal acidosis in dairy herds:Microbiological and nutritional causes,consequences,and prevention strategies  

作　　者：Mawda E.Elmhadi Darien K.Ali Mawahib K.Khogali Hongrong Wang 

机构地区：[1]Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition,College of Animal Science and Technology,Yangzhou University,Yangzhou 225009,China [2]Department of Veterinary Preventive Medicine and Public Health,Faculty of Veterinary Medicine,University of Khartoum,Khartoum North,Sudan [3]College of Animal Science and Technology,Yangzhou University,Yangzhou,225009,China

出　　处：《Animal Nutrition》2022年第3期148-155,共8页动物营养（英文版）

基　　金：the National Natural Science Foundation of China(NSFC No.31872988;No.31572429);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PADA).

摘　　要：Dairy cattle are frequently fed high-concentrate(HC)diets in modern intensive feeding systems,especially in the transition period.During this period,cows face many alterations that include hormonal changes and shifting to a lactating state.Switching to a HC diet that may disrupt the ruminal microbiota balance can lead to subacute ruminal acidosis(SARA).Moreover,the main factor shaping the rumen microbiota is dietary composition,especially the ratio of starch to fibrous carbohydrates.Feeding highly fermentable carbohydrate diets after adaptation to forage diets leads to a rumen fermentation rate that exceeds rumen absorption and buffering rates,resulting in a reduction in ruminal pH.As a result of Gram-negative bacterial cell lysis,an increase in harmful ruminal bacterial metabolites,including lipopolysaccharide,lactic acid,and histamine,is observed.The interactions between the host immune system and the ruminal microbiota play an essential role in many physiological processes and the development of the disorder.Progress in DNA sequencing and bioinformatics platforms provides new opportunities to investigate the composition of ruminal microbes and yields unique advances in understanding ecology of the rumen.Subacute ruminal acidosis is linked with a change in the ruminal microbiota structure and richness and with other metabolic disorders;such as rumenitis,milk fat depression,laminitis,and liver abscesses.Therefore,this review aims to explore a better understanding of the crosstalk between diet and microbiota in the prevalence of rumen acidosis and its consequences,which is crucial for control strategies such as feeding management,and supplementation with thiamine,prebiotics,and probiotics.

关 键 词：Subacute ruminal acidosis High-concentrate diet Microbial diversity Inflammatory and immune response Prevention 

分 类 号：S858.23[农业科学—临床兽医学]