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. 2004 Apr 23;101(18):7118–7122. doi: 10.1073/pnas.0306466101

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.