规模化奶牛场奶牛亚临床型乳房炎流行规律调查

目的 本研究旨在摸清兰考县规模化奶牛场奶牛亚临床乳房炎流行规律,为该病的防控提供参考。方法 采用加州奶牛亚临床乳房炎试验（CMT）方法对3 家规模化奶牛场的547 头泌乳奶牛进行亚临床乳房炎检测,调查该病与奶牛胎次、泌乳期和乳区的关系。结果 奶牛阳性率为20.11%,乳区阳性率为10.88%;1~2、3~4和≥5胎次的奶牛发病率分别为13.37%、20.53%和29.46%;泌乳前期、泌乳中期和泌乳后期发病率分别为15.11%、22.12%和30.89%;乳区阳性率介于8.59%~13.16%。结论 兰考县规模化奶牛场奶牛亚临床型乳房炎的发病率相对较低,与胎次、泌乳期存在正相关,与乳区无明显关系。

Investigation on Prevalence of Subclinical Mastitis in Lactating Cows in Large-scale Dairy Farms

Objective] The purpose of this study was to find out the prevalence of subclinical mastitis in dairy cows in Lankao county,and to provide reference for prevention and control of the disease in the future. Method] Subclinical mastitis was detected in 547 lactating dairy cows from 3 large-scale dairy farms using the California Dairy Subclinical mastitis Test （CMT） method to investigate the relationship between the disease and parities,lactation stages and milk regions. Result] The results showed that the positive rate of cows was 20.11% and that of milk area was 10.88%. The incidence rates of 1~2,3~4 and ≥5 parities were 13.37%,20.53% and 29.46%,respectively. The incidence rates of early,middle and late lactation were 15.11%,22.12% and 30.89%,respectively. The positive rate of milk area ranged from 8.59% to 13.16%. Conclusion] The results showed that the incidence of subclinical mastitis was relatively low in Lankao large-scale dairy farms and there was a positive correlation with parity and lactation period,but no significant relationship with milk area.