Wever P, Emanuelson U
Acta Vet Scand. 1989;30(4):465-74. doi: 10.1186/BF03548024.
Effects of bacteriological status, stage of lactation, parity and season of sampling on differential and total somatic cell counts were estimated in quarter milk samples taken from 39 dairy cows. Log somatic cell count was affected by the bacteriological status of the quarter, as well as by the bacteriological status of adjacent quarters. Differential cell counts were affected by presence or absence of pathogens in the quarters themselves, but not by the bacteriological status of the adjacent quarters. Log somatic cell count was clearly affected by stage of lactation, due mainly to physiological variation, but possibly also accentuated by variation in infection rates throughout lactation. With the exception of early lactation, little physiological variation throughout lactation was detected for differential cell counts. Presence of infections seemed to have some indirect effect on trends throughout lactation as regards percentages of granulocytes and monocytes. Variation in somatic cell counts due to parity could be explained by variation in infection rates, rather than being physiologically determined.
在从39头奶牛采集的乳区牛奶样本中，评估了细菌学状态、泌乳阶段、胎次和采样季节对体细胞分类计数和体细胞总数的影响。对数体细胞计数受乳区细菌学状态以及相邻乳区细菌学状态的影响。细胞分类计数受乳区内病原体存在与否的影响，但不受相邻乳区细菌学状态的影响。对数体细胞计数明显受泌乳阶段的影响，主要是由于生理变化，但也可能因整个泌乳期感染率的变化而加剧。除了泌乳早期，整个泌乳期细胞分类计数几乎没有检测到生理变化。感染的存在似乎对整个泌乳期粒细胞和单核细胞百分比的趋势有一些间接影响。体细胞计数因胎次而产生的变化可以用感染率的变化来解释，而不是由生理因素决定。
