Composition, Quantity and Antibiotic Susceptibility of Some Bacteria Isolated from Vaginal Discharge of Dairy Cows

Abstract

     The present study aimed to investigate the bacterial flora in the vaginal discharge of dairy cows and their susceptibility to various commonly used antibiotics. Overall, 54 samples from cows with or without post-partum metritis were used for bacterial isolation and identification using standard bacteriological criteria. Results showed that bacterial density in the vaginal discharge of cows with postpartum metritis was significantly higher (P<0,0001) than that of cows without postpartum metritis. Two bacteria genera were isolated from both uninfected and infected cows, i.e., Staphylococcus spp. and Streptococcus spp. Their prevalence in the vaginal discharge of uninfected cows was 20,00% and 13,13%, respectively. Meanwhile, these two bacterial genera were detected from all the samples (100%) of infected cows. Antibiogram demonstrated that these two bacterial genera were highly susceptible to four types of antibiotics including norfloxacin, amoxicillin, tetracycline and kanamycin. The results suggested that these four kinds of antibiotics could be used for the treatment of metritis in dairy cows.