In order to compare the diagnostic value of Modified California Mastitis Test (MCMT), Modified Whiteside Test (MWT) and Resazurin Reduction Test (RRT) using the direct microscopic leukocyte count (DMLC) as standard, a total of 739 quarter milk samples were examined. The results obtained were as follows:
1. Of the 739 samples, 24.4% had positive DMLC value (over 500,000 leukocytes per ㎖.), 32.6% positive MCMT reaction, 34.9 positive RRT reaction and 39.9% positive MWT reaction.
2. The identical ratings of the three mastitis screening tests with DMLC values were 60.7% (MWT), 61.8% (MCMT) and 72.1% (RRT).
3. The mean reaction values of the predicted mastitis screening tests were 1.09±0.01 (MWT), 1.12±0.06 (MCMT) and 1.25±0.40 (RRT). The efficiency ratings of them were 34.8% (NIWT), 49.3% (RRT) and 55.0% (MCMT) respectively.
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