Venn diagram illustrates to compare the microbiome richness shared among chickens on d 10 of receiving a diet containing 0.15% bacitracin methylene disalicylate (BMD) at (150 g/ton) during the gowning phase: starter (d 1 to 10 of age), grower (d 11 to 24 of age), and finisher (d 25 to 35 of age), or a diet containing 0.05% salinomycin (SA) at (50 g/ton) during the gowning phase from d 1 to 35 of age, or a diet containing 0.05% salinomycin from d 1 to 35 of age and had access to medicated water containing 20 grams of penicillin G potassium (Pot-Pen)/100 liter of drinking water (SA+PP) from d 19 to 24 of age, or did not receive any medicated feed or water throughout the entire experiment (a negative control group).