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《China Cattle Science》 2010-05
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Study on Factors Causing Subclinical Mastitis in Chinese Holstein

WANG Hua1,2,WANG Xiao-ning3,LIU Yi-he4,QIN Chun-hua3,HU Jian-hong1(1.College of Animal Science and Technology,Northwest A&F Unverdity,Yangling,Shaanxi,712100;2.Agri-tech Extension and Service Center in Ningxia,Yinchuan,Ningxia,750010;3.Ningxia Sygen Bioengineering Research Center,Yinchuan,Ningxia,750200;4.Ningxia Animal Husbandry Work Station,Yinchuan,Ningxia,750010)  
【Objective】The purpose of the study was to discuss the factors affecting the subclinical mastitis.【Method】 5 080 milking cows from five large scale dairy farms were investigated during the period from Jan,2009 to Jan,2010.The case control study was focused on the age,parity,daily milking yield and compartments of udder and 50 mastitis samples were randomly selected to process the etiological examination.【Result】The results showed that 8.5% of the research population were clinical mastitis positive,while 45% of that were subclinical mastitis-positive.Further,the incidence of suffering from mastitis in Chinese Holsteins may have enhanced with the increasing of the age,parity,daily milking yield.Besides,the incidence of subclinical mastitis in left and back compartment of the udder were higher than that of right and front compartment of the udder,respectively.The main pathogens were Staphyloccocus Aureus for subclinical mastitis.【Conclusion】The main means to decrease the subclinical mastitis was to strengthen the routine health management.
【CateGory Index】: S858.23
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