Vol. 6, Issue 7 (2017)

Author(s):
S Soma Sekhar Goud, A Jagadeesh Babu, CS Swetha, RA Supriya and M Shylaja

Abstract:
The increase in demand for livestock products and the development of farming, nutrition and management have led to changes in the animal production systems. The intensification of food production systems rules out tolerance of disease outbreaks; thus, various antimicrobial drugs are administered for the prevention of diseases. Antimicrobials are administered in the control treatment called metaphylaxis in order to avoid the spread of disease. Due to the spatially limited environment and repetitive production scheme, large breeding farms form closed enclaves, where the pool of the resistant microorganisms and resistance genes can be accumulated and circulate between animals and their environment. It is interesting to what extent the supply of antimicrobials results in the development of resistance and whether after the cessation of antimicrobial pressure resistance decreases. Keeping inview of the development of antimicrobial resistant E. coli the present investigation was carried out to detect the resistance patterns of E. coli isolated from dairy farm sewage. A total of 128 sewage samples were collected from organized, unorganized dairy farms and also from animal sheds of small farms and isolated E. coli. All the 128 isolates were confirmed as Escherichia coli by subjecting them to various biochemical tests. Antibiogram pattern was studied for the isolates using 14 antibiotic discs, which revealed varying degree of resistance to ampicillin (92.19%), Penicillin-G (76.56%), cefotaxime (71.10%), streptomycin (64.84%), gentamicin (64.06%), chloramphenicol (57.81%), tetracycline (54.69%), cefoperazone (51.56%), ofloxacin (44.53%), cefadroxil (39.06%), ciprofloxacin (38.28%), azithromycin (30.40%), meropenem (27.34%) and tigecycline (20.31%).