Bovine Mastitis: Prevalence, Risk Factors, Major Pathogens and Antimicrobial Susceptibility Test on the Isolates around Addis Ababa, Central Ethiopia

A total 351 lactation cows were investigated during th e study period. Out of total 351 lactation cows the overall prevalence of mastitis were 80(22.79%) (Table 1), where lower 5 (1.99%) and higher 73 (20.79%) were respectively by clinical and sub clinical type of mastitis. And the prevalence of mastitis was l ower 20.94% and higher 24.13% in Sululta and Bareh districts respectively. From examined lactating cows 7.40% was at least 1teat blind. From currently tested few isolates using selected antimicrobial agents, all susceptible for Chloramphenicol and Gentamyc in except one each isolates of S.aureus and micrococcus spp for both and C.pyogenes for Chloramphenicol and CNS for Gentamycin which shows intermediate. Similarly most of the isolates susceptible to Amoxycillin except some isolates of S. aureus, Str.uberis, CNS and C. pyogenes. However, high resistance was observed by most of isolates to Penicillin and tetracycline which are drugs currently in use for mastitis therapy in the study area. Prevalence of mastitis, particularly, the subclin ical one could bring about major economic losses in dairy cows without notice as result of reduced milk production, poor growth or mortality of suckling calves and dam health.