Abstract

The present study was under taken to find out the comparative efficacy of commonly used diagnostic tests for detection of subclinical mastitis in dairy cattle of Andhra Pradesh. Present communication aims to find out the specificity, sensitivity and predictive value of different indirect tests California mastitis test (CMT), electrical conductivity (EC) and somatic cell count (SCC) taking cultural test as standard in sub clinical mastitis affected cattle. Out of 135 quarter milk samples subjected to CMT, EC and SCC taking cultural examination as standard, the per cent accuracies were found to be 73.33, 70.37 and 71.00 respectively. The false positive reactions were more in CMT (24.60%) followed by SCC (23.70%) and EC (20.40%) where as the false negative reactions were highest in EC (34.90%) followed by SCC (31.60%) and CMT (28.60%). The sensitivity, specificity and predictive value of different tests were studied and it was found that EC had the highest specificity (84.84%) and predictive value (79.59%) with lowest sensitivity (56.62%) than compare with the other diagnostic methods for diagnosis of sub clinical mastitis in cattle. Electrical conductivity can be used as the decision criteria to treat or to cull the animals in herds with high prevalence of subclinical mastitis.