Individual and group antimicrobial usage rates on 34 farrow-to-finish swine farms in Ontario, Canada

摘要: Abstract Antimicrobial drug-use was assessed on 34 farrow-to-finish operations that marketed at least 500 hogs/yr. These either did not use any antimicrobials or used narrow-spectrum broad-spectrum in rations of post-weaning pigs. Total antimicrobial measured for two months after obtaining inventories and records all used. The collection empty medication bottles drugs hand convenient producers useful estimating validating recorded treatment rates, particularly were only one class pig. Treatment records, however, underestimated by approximately 35% the amounts 27/29 farm–antimicrobial combinations. Rates individual-pig varied from 0–24.1 pigs treated/1000 pig-days, with a median 5.29. Most individual animal treatments given to piglets sows parturition penicillin most commonly antimicrobial. Gentamicin administered suckling 19 farms.