Major Bacteria Causing Bovine Mastitis and their Sensitivity to Common antibiotics.

Abstract

Milk samples from a herd of 7 pure Holstein, 15 Holstein x Barca and 21 Holstein x Boron crossbred cattle were aseptically collected and subjected to bacteriological examination. Clinical and subclinical mastitis was found in 67.4% of the animals examined. The major bacteria causing mastitis in the herd were predominantly staphylococci followed by streptococci and corynebacteria. There were varying degree of antibiotic resistance of up to 51.9% to axacillin. Mastitis prevalence between pure Holstein and crossbred animals was not significantly different.