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Abstract
The prevalence of bacterial species in each of 103 clinically unaffected and affected caprine udders in the Sahel zone of Nigeria was investigated. A total of 11 genera of bacteria were isolated from unaffected and affected udders. Of the 39 bacterial species isolated from the udders, Acinetobacter anitratus, Bacillus subtilis, Escherichia coli, Pasteurella haemolytica and Staphylococcus aureus occurred significantly (P<0.05) more often than other species in affected compared with unaffected udders. Minimum inhibitory concentrations (MICs) of six antibiotics tested against the significant isolated showed that tylosin had the lowest inhibitory concentrations ranging from 0.10–0.39 μg/ml. Streptomycin and methicillin with MICs of 0.10–0.65 μ/ml and 0.13–1.04 μg/mg, respectively, were lower than bacitracin oxytetracycline and cloxacillin. The need to ascertain antibiotic inhibitory concentrations against significant isolates from different geographical locations for effective chemotherapy and control of caprine mastitis are indicated.
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