The comparing of antibiotic resistance pattern in Escherichia coli isolates from chicken meat that reared under conventional and without antibiotic condition

The using of antibiotics in chicken production is one of main concerns in consumers of this protein source that usually these compounds administrated for antimicrobial effect and control of microbial infections in poultry production. For comparing the antibiotic resistance pattern in Escherichia coli (E. coli) that isolated from different growing conditions (conventional and without antibiotic), the E. coli strains were isolated from chicken meat and cecal content of chickens that were reared under conventional and without antibiotic conditions, in Isfahan province. After purification of E.coli strains on specific bacterial culture, and approve of bacterial strains according to biochemical tests, the isolates were cultured on Mueller-Hinton culture. The antibiotic resistance pattern was examined by disc-diffusion agar test. The results showed that the antibiotic resistance to different medicinal and veterinary antibiotics groups has occurred in two different growing conditions but the antibiotic resistance was lower in without antibiotic than conventional growing condition.