Abstract
From 840 quarters of 210 cows showing no clinical mastitis, 7 cases of abnormal milk in somatic cell counts (AMSCC)(SCC<3×105/ml, no bacteria), 2 cases of latent mastitis milk, 5 cases of infected milk and 5 cases of normal milk were examined for temporal changes in the ratio of epithelial cell and neutrophil counts. While the pattern and change of somatic cell count (SCC) was comparable in all cases, 5 of the 7 cases of AMSCC had larger epithelial cell fractions than neutrophil ones. Subsequent bacterial examination revealed that the remaining 2 cases of AMSCC which were diagnosed as latent mastitis, had the number of bacteria in the milk and the neutrophil fractions were larger. Differential count of SCC at 30 to 60 minutes after milking should help the diagnosis of AMSCC.
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