对奶牛隐性乳房炎发生规律的探究

目的]进一步探讨奶牛隐性乳房炎发生与自然月份、胎次、乳区、牛舍、泌乳月等的关系,以便更好的掌握奶牛隐性乳房炎与外界环境及奶牛泌乳生理状态的关系,为隐性乳房炎的预防和治疗提供科学的依据。方法]2008年11月至2009年4月通过对南方某牧场泌乳牛群进行隐性乳房炎的CMT逐月检测,分析了奶牛隐性乳房炎的发生规律。结果]表明,该场奶牛隐性乳房炎二、三胎牛阳性率极显著高于其他胎次（P〈0.01）;第五、第六个泌乳月和第九个泌乳月以上牛新感染阳性率极显著高于其它牛（P〈0.01）,左乳区阳性率高于右乳区。结论]隐性乳房炎的发生率有随着胎次和泌乳时间的增加而提高的趋势。

Analysis on Incidence of Subclinical Mastitis of Cows

【Objective】To study the relationship between subclinical mastitis and nature month,parity,mammary quarter,cow house and lactation month,so as to have a better understanding of the relationship among the environmental factors,subclinical mastitis,physiological state of cows,and to provide a scientific basis for the prevention and treatment.【Method】In this paper,CMT was used to test the subclinical mastitis once a month in a southern cattle farm from November,2008 to April,2009.【Results】The results showed that the positive rate of subclinical mastitis for the second and third lactation was significantly higher than other lactations（P0.01）.The new case of the cattle who was in the fifth,the sixth and the ninth lactation month was obviously higher than other cattle（P0.01）.And the new case of positive rate in the mammary quarter was higher than that of right quarter.【Conclusion】The incidence of subclinical mastitis increased as the parity and the time of lactation growing.