Authors : Ling Wang, Feng Yang, Xiaojuan Wei, Yongjiang Luo, Xuzhen Zhou, Wenzhu Guo, Jiangrong Niu and Zhiting Guo
Abstract: The objective of this study was to determine the prevalence of mastitis, identify the frequency alteration of predominant pathogens related to clinical and subclinical mastitis in Gansu and Ningxia Province of China. The 29 dairy farms comprising 2000 lactating cows enrolled from April 2012 to November 2014 of which 43.0% (860/2000) were found positive for mastitis by physical examination and Lanzhou Mastitis Test (LMT), the prevalence of Clinical Mastitis (CM) and Subclinical Mastitis (SCM) at cow level were 5.10 and 37.90%, respectively. The proportion of samples contained major pathogens were 97.60% and 871 isolates obtained from 860 milk samples. The common isolates from CM were E. coli (26.89%), S. agalactiae (21.01%) and S. aureus (19.33%) while from SCM were S. agalactiae, S. dysgalactiae and S. aureu, accounted for 30.45, 18.62 and 14.89%, respectively. The contagious pathogens had showed to predominate over the environmental pathogens and the Streptococcus sp. was found the predominant species which remains a significant cause of mastitis in local cattle herds.
Ling Wang, Feng Yang, Xiaojuan Wei, Yongjiang Luo, Xuzhen Zhou, Wenzhu Guo, Jiangrong Niu and Zhiting Guo, 2015. Investigation of Bovine Mastitis Pathogens in Two Northwestern Provinces of China from 2012-2014. Journal of Animal and Veterinary Advances, 14: 237-243.