Objective - Validate, by sensitivity and specificity analyses, use of somatic cell count (SCC) to predict bacteriologically positive subclinical mastitis in a California dairy herd with low SCC. Design - Study of monthly dairy herd improvement SCC obtained from the immediate preceding lactation and individual cow composite milk sample microbiologic isolates collected at calving. Animals - 515 California dairy cows with SCC and culture data. Procedure - Somatic cell count sensitivity and specificity analyses with combinations of SCC parameter and at various thresholds were done, using the bacterial isolates as the standard. Results - Combination of SCC threshold and SCC parameters could not bo developed that had sufficient sensitivity and specificity to be a useful predictor of cows that would calve with subclinical mastitis. Clinical Implication - Under the conditions at this par-ticular dairy, SCC could not be used as a basis of prediction of cows that would calve with bacteriologically positive subclinical mastitis or require selective nonlactating-cow antibiotic treatment.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of the American Veterinary Medical Association|
|State||Published - Apr 1 1996|
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