Coffey E M, Vinson W E, Pearson R E
J Dairy Sci. 1986 Feb;69(2):552-5. doi: 10.3168/jds.S0022-0302(86)80437-4.
Somatic cell counts (log, base 2) and rates of infection in first and subsequent lactations were examined by classes of somatic cell count in initial test day of first lactation to determine if cows with initially low counts were more at risk to subsequent mastitis infection. Classes of initial somatic cell counts were less than 100,000, 100,000 to 400,000 and greater than 400,000. Differences among initial classes in subsequent cell counts were small, but the initial rank of classes was maintained throughout the remainder of first lactations and in subsequent lactations. Differences among initial classes for rates of infection in first and subsequent lactations consistently favored low initial cell counts. Results gave no indication that cows initially low in cell count are at greater risk of subsequent mastitis infection.
通过首次泌乳初始检测日的体细胞计数类别，对体细胞计数（以2为底的对数）以及首次和后续泌乳期的感染率进行了检查，以确定初始计数较低的奶牛是否更容易受到后续乳腺炎感染。初始体细胞计数类别分别为低于100,000、100,000至400,000以及高于400,000。后续细胞计数在初始类别之间的差异较小，但这些类别的初始排序在首次泌乳的剩余时间以及后续泌乳期都得以保持。首次和后续泌乳期感染率在初始类别之间的差异始终有利于初始细胞计数较低的情况。结果表明，初始细胞计数较低的奶牛并无更高的后续乳腺炎感染风险。
