ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 90 Number 3
Correlation of California mastitis test and somatic cell count on milk of water buffalo cows in the Philippines. (154)
The objective of the study was to determine the correlation of California Mastitis Test (CMT) and somatic cells count (SCC) on milk of Murrah buffalo cows. It aimed to calculate the prevalence of subclinical mastitis (SCM), sensitivity and specificity of CMT using SCC as the basis, determine the predictive values of CMT, calculate the true prevalence of subclinical mastitis based on sensitivity and specificity established, and determine the variations on the correlation of SCC and CMT against several factors: age of animal, parity number and length of lactation. Pearson’s correlation analysis and Kappa statistics were used for statistical analysis. Results showed that Correlation and Kappa statistics had a 23.37% (p <.0001) and 20.20% (p <.0001) respective agreement between the results of SCC and CMT. SCM prevalence were 30.29% and 23.46% based on CMT and SCC, respectively. The CMT has 54.43% sensitivity and 77.10% specificity. The positive predictive value of CMT was 42.11% while the negative predictive value was 84.67%. The calculated true prevalence of the test was 23.33%. Test agreement may change from slight to fair depending on the factors considered such as the age of the animal, parity number and length of lactation.
Keywords: CMT; SCC; Water Buffalo, Philippines