TY  - JOUR
T1  - Prevalence and Major Pathogen Causes of Dairy Cows Subclinical Mastitis in Northeast China
AU - , Nai-Sheng Zhang AU - Chen, Yuan-Yuan AU - , Zheng-TaoYang AU - , Wen-Bo Liu AU - , Qiao-Cheng Chang AU - , Li-Guo Wang 
JO  - Journal of Animal and Veterinary Advances
VL  - 11
IS  - 8
SP  - 1278
EP  - 1280
PY  - 2012
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2012.1278.1280
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2012.1278.1280
KW  - Subclinical mastitis
KW  -prevalence
KW  -major pathogen
KW  -Northeast China
KW  -Escherichia coli
KW  -China
AB  - The prevalence of subclinical mastitis in dairy cows was surveyed in Northeast China between June, 2011 and September, 2011. A total of 1860 apparently healthy dairy cows were detected from three provinces (Heilongjiang, Jilin and Liaoning) that locate in Northeast China. All milk samples were examined by California Mastitis Test (CMT). All positive milk samples were analyzed by microbiologically. The results showed that the overall prevalence of subclinical mastitis in dairy cows was 34.0% and the prevalence is similar in 3 different province which Heilongjiang (32.0%, 236/738), Jilin (36.9%, 173/469) and Liaoning (34.3%, 224/653), respectively. The prevalence in intensively reared dairy cows (15.3%, 155/1016) was lower than that in semi-intensively reared dairy cows (56.6%, 478/844), (p&lt;0.05). The dominant bacterial isolates in the study were <I>Staphylococcus</I> species (32.0+26.9 = 62.9%), <I>Streptococcus</I> species (6.2+7.3+2.0 = 15.5%) and <I>Escherichia coli</I> species (12.4%). The results of this survey indicated the presence of subclinical mastitis in dairy cows in Northeast China and rearing system is an important factor to affect the subclinical mastitis in dairy cows in Northeast China and <I>Staphylococcus</I> specie was major pathogen.
ER  -