Preliminary studies on bacteria recovered from milk of apparently healthy udder in dairy cattle at El Haram area with special reference to antibiotic sensitivity

Milk Samples, were randomly collected from apparently healthy udders of 517 milking friesian cattle for bacteriological examination. Sixty-one strains were isolated in a recovery rate of 11.8% of the samples. Microorganisms secured were staph. coagulase positive [60.66%], streptococci [31.14%] including Str. Agalactiae [16.3%]. Str. Dysgalactiae [11.4%], Str. Uberis [3.2%]. In addition, E. coli and C. pyogenes were recovered in an incidence of 4.9% and 3.2% respectively. The incidence of double infection was 51.2% of the infected cases. The secured organisms were sensitive to the following antibiotics in a descending order: Kanamycin, Erythromycin, Polymyxin, Streptomycin and Penicillin