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Abstract
Two goat herds were examined to determine the prevalence and causes of subclinical mastitis and to assess the value of some laboratory tests currently used as aids in the diagnosis of caprine mastitis. Due to large variation in mean cell count, the Whiteside test and California mastitis test were unreliable in diagnosis of caprine mastitis. N-acetyl-β-D-glucosaminidase (NA-Gase) activity in the milk was a sensitive method in detecting subclinical mastitis in goats. In 381 samples from mammary gland halves of 191 goats, the prevalence of infection in the two herds ranged from 13.0% to 20.0%. Organisms isolated were coagulase-negative staphylococci 54.2%, coagulase-positive staphylococci 20.3%, alpha-haemolytic streptococci 2.0%, Pasteurella haemolytica biotype A 5.0%, Mycoplasma agalactiae 6.0% and Escherichia coli 4.0%.
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