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Relationship Between N-Acetyl-ß-D-Glucosaminidase Activity and Cell Count, Lactose, Chloride, or Lactoferrin in Cow Milk

Hokkaido Branch Laboratory, National Institute of Animal Health, Hitsujigaoka, Sapporo, 061-01, Japan

M. Komatsu

National Institute of Animal Industry, Tsukuba Norindanchi, P.O. Box 5, Ibaraki, 305, Japan

ABSTRACT

Activity of N-acetyl-ß-D-glucosaminidase was measured in foremilk samples collected from cows. A total of 64 samples were collected from these cows, some of which were affected by mastitis. They were examined for N-acetyl-ß-D-glucosaminidase activity, cell count in whole milk, and milk chloride, lactose, and lactoferrin. The correlation coefficient was .72 between activity and cell count, –.80 between activity and lactose, and .88 between activity and chloride. Therefore, the correlations between N-acetyl- ß-D-glucosaminidase activity and milk components, chloride and lactose, were larger than that between N-acetyl-ß-D- glucosaminidase activity and cell count. The correlation coefficient was high (.91) between N-acetyl-ß-D-glucosaminidase and lactoferrin. The N-acetyl-ß-D-glucosaminidase activity in cow's milk has potential for diagnosis of mastitis.