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Cell Content of Goat Milk: California Mastitis Test, Coulter Counter, and Fossomatic for Predicting Half Infection

Institut National de la Recherche Agronomique, Station de Pathologie de la Reproduction, 37380 Nouzilly, France

ABSTRACT

The mean cell count of goat milk collected in early and midlactation from udder halves free of infection was 1404 x 10³ cells/ml and 614 x 10³ cells/ml estimated by Coulter Counter and Fossomatic. Arithmetic means of cell count by Fossomatic method for samples within California Mastitis Test scores were similar to results from cow milk. Results by the three methods were closely correlated .7.

Means of cell counts were 2858 x 10³ cells/ml and 1293 x 10³ cells/ml by Coulter Counter and Fossomatic methods for udder halves harboring coagulase-negative staphylococci and 8946 x 10³ cells/ml and 4804 x 10³ cells/ml for halves infected by major pathogens. Of the thresholds examined, 1000 x 10³ cells/ml was most satisfactory for both Coulter Counter and Fossomatic methods, because it detected about 80% of major infections and gave an acceptable proportion of errors.