Natzke R P, Oltenacu P A, Schmidt G H
J Dairy Sci. 1978 Feb;61(2):233-8. doi: 10.3168/jds.s0022-0302(78)83583-8.
Removing milker units as soon as milk flow stopped was compared to milking for a fixed time of 12 min in an 8-wk trial with 60 cows. Teats were dipped in broth culture of approximately 10(9) colony forming units per ml of Staphylococcus aureus, Streptococcus agalactiae, and Streptococcus uberis for 4 wk. More new infections of quarters occurred in the 12-min group. In trials 2 and 3, 20 additional cows were milked with automatic milking machine detachers and 20 cows were milked with a flow control unit for 12 min each trial. New infection rates were highest in the two groups milked for 12 min. Age for lactation and cows were associated with most of the variation in the new infection rate. Cows with pointed teat ends had the highest rate of new infection. Effects of fixed-time milking on increased mammary infection and clinical mastitis were small.
在一项为期8周、涉及60头奶牛的试验中，将牛奶流停止后立即移除挤奶设备的情况与固定挤奶12分钟的情况进行了比较。在4周的时间里，将乳头浸入每毫升含有约10⁹个菌落形成单位的金黄色葡萄球菌、无乳链球菌和乳房链球菌的肉汤培养物中。12分钟组出现了更多的乳房新感染病例。在试验2和试验3中，每次试验另外20头奶牛使用自动挤奶机拆卸器挤奶，20头奶牛使用流量控制装置挤奶12分钟。在挤奶12分钟的两组中，新感染率最高。泌乳年龄和奶牛与新感染率的大部分变化有关。乳头末端尖锐的奶牛新感染率最高。固定时间挤奶对增加乳腺感染和临床乳腺炎的影响较小。
