组和2组隐性乳腺炎的乳区发病率差异不显著（P>0 05），与对照组差异极显著（P<0 01）；

The udder region incidence of the group 1 was not remarkable (against that) of the group 2 (P>0.05), and the incidence against control was significantly remarkable (P<0.01).

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结果：包头地区奶牛乳腺炎病原菌检出率高达5 7.5 % ，常见病原菌依次为金黄色葡萄球菌、大肠杆菌、绿脓杆菌、无乳链球菌、停乳链球菌、沙门氏菌、克雷伯氏菌。

Results:The detectable rate of the pathogenic germs in cow mastitis in Baotou district is high, up to 57.5%. The common pathogenic germs in cow mastitis are as follows: S. aureus, E.

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