Table 1. Antimicrobials used on broiler poultry farms.
Purpose | Farm 1 | Farm 2 | Farms 3 and 4 | |
---|---|---|---|---|
Prophylactic | Gentamicin, 0.1 mg/egg | Gentamicin, 0.2 mg/chick, s.c. | Gentamicin, 0.2 mg/egg | |
Starter feed (weeks 1 and 2) | Antibiotic | Bacitracin virginiamycin | Bacitracin | None |
Coccidiostat | Diclazuril/semduramycin | Roxarsone/salinomycin | Salinomycin | |
Grower feed (weeks 3 and 4) | Antibiotic | Bacitracin | None | None |
Coccidiostat | Salinomycin | Roxarsone/salinomycin | Salinomycin | |
Finisher feed (weeks 5 and 6) | Antibiotic | None | None | None |
Coccidiostat | None | None | None | |
Withdrawal feed (week 7) | Antibiotic | Virginiamycin | None | None |
Semduramycin and salinomycin are ionophores, and roxarsone is an arsenical.