Abstract
Three hundred and sixty-nine milk samples from half udders of 188 Murciano-Granadina goats in the second and third month of lactation, from ten commercial dairy goat herds were studied. Bacteriological analyses, California Mastitis Test (CMT) and somatic cell count (SCO by Fossomatic Counter were performed. The best SCC threshold for defining subclinical mastitis was 500 × 10 3 cells ml −1, but this threshold had a poor positive predictive value (28.5%) and only 62.3% of samples were correctly classified. Arithmetical and geometrical means of SCC showed statistical differences between infected and uninfected glands. Arithmetical and geometrical means of SCC per microlitre for each CMT score were, respectively: 312 × 10 3 and 172 × 10 3 for Score 0 and traces; 1014 × 10 3 and 531 × 10 3 for Score 1; 2912 × 10 3 and 2051 × 10 3 for Score 2; and 4950 × 10 3 and 4436 × 10 3 for Score 3. The CMT Scores 2 and 3 discriminated between infected and uninfected udder glands. The results show that both tests could be used in the period of study to detect a high percentage of true uninfected glands but the percentage of false positives was high.
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