张家口地区奶牛隐性乳腺炎的流行特点

Epidemic Characteristics of Subclinical Mastitis of Dairy Cows in Zhangjiakou Region

在春夏秋冬四个不同的季节采集张家口地区奶牛的奶样,通过CMT法检测奶牛隐性乳腺炎的发病率。结果个体阳性平均率为52.3%,阳性乳区平均率为19.2%,奶牛隐性乳腺炎的发病率与季节没有明显的相关性、与胎次呈正相关,后乳区的阳性率明显高于前乳区。

Milk samples of dairy cows in Zhangjiakou region were collected around the year. Subclinical mastitis incidence of cows was detected with the method CMT.The results were that the positive average rate of individ- ual Subclinical mastitis was 52.3%,the positive rate of milk area was 19.2%,the incidence of subclinical mastitis of cow hadn,t significant relationship with season,had positive relationship with parity , the positive rate was signifi- cantly higher in rear milk area than in fore milk area .