【摘要】 对湖南省４个地区１４个牛群的调查表明，奶牛隐性乳房炎患病率为６７．３％，乳室患病率为３６．７％。本病的主要病原菌为葡萄球菌（５２．８％），其次为杆菌（２６．７％）和链球菌（２０．５％）。舍饲牛群以葡萄球菌为主，而放牧牛群以大肠杆菌等杆菌为主，二者差异极显著（ｐ＜０．０１）。更多还原

【Abstract】 By means of researching 14 cattle groups in 4 districts of Hunan Proviince. Theresults obtained are as follows:incidence of milk cattle’s subclincal mastitis is 67.3%, andthe quarter incidence is 36.7% Staphylococcus(52.8%)are major pathogenic bacteria tothis desease,and streptococcus(20.5%)or coliform group(26.7%)is the second for subcli-cal mastitis.The major pathogenic bacteria are coliform group for the milk cattles of pastur-ing area.and are staphylococcus for feeding plants,There is significant difference betweenthe pathogenic bactteria on grazing cattles and feeding plants更多还原