Differences in the predicted functional meta-genomes of the cecum microbiota at KEGG level 3. (A) Comparison of the functional pathways of microbes in the CON and D-FSE groups. (B) Comparison of the functional pathways of microbes in the CON and H-FSE groups. (C) Comparison of the functional pathways of microbes in the ZB and D-FSE groups. (D) Comparison of the functional pathways of microbes in the ZB and H-FSE groups. CON group, basal diet; ZB group, basal diet + 30 mg/kg Zinc bacitracin; D-FSE group, basal diet + 50 mg/kg FSE; H-FSE group, basal diet + 100 mg/kg FSE, n = 6.