author(s)
K Balamurugan, S Subapriya, NM Dinesh and P Partheban

abstract
Repeat breeding is one of the main problems associated with antibiotic resistance. The current study was to identify the bacterial infection and ascertain the degree of sensitivity of the isolated bacteria against a panel of antimicrobial agents. In a breeding season, 45 mares (42%) were positive for culture and 62 mares (58%) were negative for any pathogen. A total of 45 bacterial isolates were done antibiotic sensitivity test. They were 31 numbers of Escherichia coli and 8 numbers of Streptococcus spp. beta haemolytic group and 6 numbers of Staphylococcus spp. Ofloxacin showed higher sensitivity towards E. coli with 55%, Cefotaxime showed higher sensitivity towards Streptococcus spp. beta haemolytic group with 76% and Amoxicillin+clavulanate and Gentamicin showed 100% sensitivity towards Staphylococcus spp. The same organisms showed different sensitivity with different mares. Mainly E. coli was highly variable. Hence, this study suggests that antibiotic sensitivity test is highly recommended in E. coli infection.