This study was carried out to diagnostic test for bovine mastitis by the determination of adenosine triphosphate (ATP) based on firefly bioluminescence. The results obtained are follow;
1. The infection rate of bovine mastitis investigated with 521 cows in 47 dairy farms were found to be 3.6% of clinical form and 44.1% of subclinical form according to the degree of infection.
2. The light yield produced in firefly bioluminescence system was proportional to the concentration of ATP giving stright line within the range of 100PM∼luM.
3. When the number of somatic cell in milk was determined by the ATP assay and compared with three conventional methods such Fossomatic, California mastatic test (CMT), and rolling ball viscometer (RBV), it was shown that r=0.92 for Fossomatic, 0.63 for CMT and 0.7 for RBV.
4. The microorganisms causing mastitis were isolated Staphylococcus sp. (53.3%) Streptococcus sp. (17.9%), Micrococcus sp. (13.5%), Graxa negative bacilli (6.3%), Gram positive bacilli (5.5%) and Yeast-like fungi (5.4%).
5. The endogeneous ATP levels of bacteria in a raw milk determined by the firefly bioluminescence system and compared with the results of the conventional methods. The correlation was 0.88 for raw milk.
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