2Ravindran V, Thomas D. Performance and welfare of broilers as affected by stocking density and zinc bacitracin supplementation[J]. Animal Science Journal, 2006,77(1) : 110- 116.
3Jorgensen J H, Turnidge J D, Washington J A, Manual of Clinical Microbiology[M]. Washington D C: American Society for Microbiology, 1999.
4Cotter G, Adley C. Comparison and evaluation of antimicrobial susceptibility testing of enterococci performed in accordance with six national committee standardized disk diffusion procedures[J]. Journal of Clinical Micryobiology, 2001, 39:3753-3756.
5Huys G, Haene K. Influence of the culture medium on antibiotic susceptibility testing of food-associated lactic acid bacteria with the agar overlay disc diffusion method[J]. J Letters in Applied Microbiology, 2002,34(6) :402-406.
6Gevers D, Huys G, Devlieghere F. Isolation and identification of tetracycline resistant lactic acid bacteria from pre-packed sliced meat products[J]. Systematic and Applied Microbiology, 2000, 23: 279-284.
7Okerman L, Croubels S. Inhibition tests for detection and presumptive identification of tetracyclines, beta-lactam antibiotics and quinolones in poultry meat[J ]. Food Additives & Contaminants, 2001, 18 (5): 385- 393.
8Mujdat A, Nese K, Recep K. Effects of dietary supplementation with organic acids and Zinc bacitracin on ideal microflora,p H and performance in b roilers[J]. Tr J of Veterinary and Animal Sciences, 1999,23:451-455.
9Andrews J M. The BSAC working party on susceptibility testing BSAC standardized disc susceptibility testing method[J].Journal of Antimicrobial Chemotherapy, 2001,48 : 43- 57.
