The bacterial causes of subclinical mastitis were determined in samples of milk taken from one half of the udders of 159 goats in three different herds. The mean prevalence of subclinical infection was 33 per cent, with prevalences of 26 per cent, 39 per cent and 42 per cent in the three herds. Staphylococcus aureus was isolated from seven (13 per cent) of the 53 infected halves, coagulase-negative staphylococci accounted for 47 per cent, Corynebacterium species for 31 per cent and α-haemolytic streptococci for 6 per cent of the infected samples. The mean somatic cell count of the uninfected milk samples was 428,000 cells/ml, and 93 per cent of uninfected samples had counts less than 1,000,000 cells/ml; the mean cell count of the infected samples was 2,785,000 cells/ml.
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