【摘要】 通过对辽西地区规模奶牛场及农户的近5 000头奶牛乳房炎发病率的调查表明:奶牛乳房炎的发病率随着年龄的增加而逐渐上升,7~8岁时达到高峰,以后有下降趋势;泌乳月的增加会提高发病率;夏季由于天气炎热,气温过高,发病率明显高于其他季节;环境卫生条件的好坏也很大程度影响发病率;机器挤奶较手工挤奶发病率稍高。更多还原

【Abstract】 Survey on the incidence of mastitis of 5000 cows in large scale dairy farm and smallholders in west Liaoning indicated that the incidence of mastitis increases with the progress of age,and the incidence decreased after the peak value at 7 to 8 year-old;the incidence also increased with the advancing of milk month;in the summer time,the high temperature caused the increase of the incidence;the environmental condition can affect the incidence as well,the incidence of mastitis for the machine milking was slightly higher than that for hand milking.更多还原