Hogan J S, Smith K Larry, Todhunter D A, Schoenberger P S
Department of Dairy Science, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691.
J Food Prot. 1990 Jan;53(1):67-71. doi: 10.4315/0362-028X-53.1.67.
Quarter, composite, and bulk tank milk samples were analyzed in a three laboratory collaborative study to determine the relationship of milk fat and protein content with milk somatic cell counts. Milk somatic cell counts were determined by two Coulter counters, a Fossomatic counter, and by direct microscopic somatic cell counting. In general, variability among somatic cell counts measured by different procedures was not related to protein or fat content of milk. The greatest percentage of variation between counts that could be explained by fat content of milk was 20.2% between a Coulter and direct microscopic somatic cell counts. The greatest percentage of variation between counts that could be explained by protein content of samples was 12.9% between a Coulter and Fossomatic counts. Breed of cow from which samples were collected also had little influence on differences among milk somatic cell counts. Differences among milk somatic cell counts due to counting methods did vary among quarter, composite, and bulk tank milk samples.
在一项三实验室合作研究中，对四分位、混合和大容量储槽牛奶样本进行了分析，以确定乳脂肪和蛋白质含量与牛奶体细胞计数之间的关系。牛奶体细胞计数通过两台库尔特计数器、一台Fossomatic计数器以及直接显微镜体细胞计数来确定。总体而言，不同程序测量的体细胞计数之间的变异性与牛奶的蛋白质或脂肪含量无关。牛奶脂肪含量能够解释的计数之间最大变异百分比为库尔特计数器和直接显微镜体细胞计数之间的20.2%。样本蛋白质含量能够解释的计数之间最大变异百分比为库尔特计数器和Fossomatic计数器之间的12.9%。采集样本的奶牛品种对牛奶体细胞计数之间的差异也几乎没有影响。由于计数方法导致的牛奶体细胞计数差异在四分位、混合和大容量储槽牛奶样本中确实有所不同。
