Lissemore K D, Leslie K E, McBride B W, Burton J H, Willan A R, Bateman K G
Department of Population Medicine, University of Guelph, Ontario.
Can J Vet Res. 1991 Apr;55(2):196-8.
Data were collected on udder health variables as part of a study of the effects of recombinant bovine somatotropin on production in lactating dairy cows. Milk samples, obtained at three intervals during the study, were assessed for their somatic cell count and bacteriological culture result. There was an increase in the prevalence of infection at mid-lactation in the 20.6 and 41.2 mg per day treatment groups as compared to the controls. There was no difference detected in the mean cell count between groups from the samples collected pretrial, mid-lactation, or late lactation. However, analysis of the individual cow Dairy Herd Improvement somatic cell count data showed a difference between groups which was most evident in mid-lactation.
作为重组牛生长激素对泌乳奶牛生产性能影响研究的一部分，收集了乳房健康变量的数据。在研究期间的三个时间点采集牛奶样本，评估其体细胞计数和细菌培养结果。与对照组相比，每天20.6毫克和41.2毫克治疗组在泌乳中期的感染率有所增加。在产前、泌乳中期或泌乳后期采集的样本中，各组之间的平均细胞计数没有差异。然而，对个体奶牛群体改良体细胞计数数据的分析显示，各组之间存在差异，这在泌乳中期最为明显。
