Zecconi A, Hamann J, Bronzo V, Ruffo G
Istituto di Malattie Infettive, Università degli Studi di Milano, Italia.
J Dairy Res. 1992 Aug;59(3):265-71. doi: 10.1017/s0022029900030545.
Machine-induced changes in teat thickness were measured in a randomly selected group of 22 cows from a commercial dairy herd consisting of 110 cows during an experiment lasting 1 year. Half the cows used were free from mastitis whereas the remainder had at least one quarter infected by environmental pathogens. Teats were classified according to a threshold change in teat end thickness of 5%. The relationships between quarter infection or teat duct colonization and teat end thickness changes induced by machine milking were investigated. Teats with greater than 5% change in thickness had significantly increased teat duct colonization and a slight, non-significant, increase in quarter infection. We conclude that machine-induced changes in teat end thickness are predisposing factors for teat duct colonization by environmental pathogens. This may provide an increased new infection risk, especially when hygiene is poor.
在一项为期1年的实验中，从一个由110头奶牛组成的商业奶牛群中随机挑选了22头奶牛，测量机器挤奶引起的乳头厚度变化。所使用的奶牛中有一半没有患乳腺炎，而其余的至少有一个乳腺被环境病原体感染。根据乳头末端厚度5%的阈值变化对乳头进行分类。研究了乳腺感染或乳头导管定植与机器挤奶引起的乳头末端厚度变化之间的关系。厚度变化大于5%的乳头，其乳头导管定植显著增加，乳腺感染略有增加但不显著。我们得出结论，机器引起的乳头末端厚度变化是环境病原体在乳头导管定植的诱发因素。这可能会增加新的感染风险，尤其是在卫生条件较差时。
