the effect of feeding subtherapeutic ( 27.5 micrograms/g of diet for 85 d ) and therapeutic ( 220 micrograms/g of diet for 14 d , followed by an antibiotic-free diet for 71 d ) levels of chlortetracycline ( ctc ) on the antibiotic resistance of fecal coliforms of pigs from two herds ( 36 pigs/herd ) with different histories of antibiotic exposure when housed in a newly constructed confinement facility was determined .
C0949285
antibiotic resistance
C0003232
antibiotic