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l~ive screening tests, Direct Microscopic Leucocyte Count, Wisconsin Mastitis Test, California Mastitis Test, Clemson Catalase Test, Wisconsin Catalase Test, used in estimating leucocyte concentrations were evaluated using 1,308 producer milk samples and 97 tank-delivered samples. These milk samples were representative of the South Carolina milk supply. The Wisconsin test was the most reliable method for estimating leucocytes in milk, using the microscopic count for comparison. This applied to both producer and tank-delivered samples. The Clemson and Wisconsin Catalase tests and the California test were not as reliable predictive tests of leucocyte concentration when compared with microscopic count.
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J.J. Janzen (1969) studied this question.
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