The microbial community structure in different groups of broilers. (A) Principal Component Analysis (PCA) of cecum microbe. (B) Weighted unifrac distance heat-map of cecum microbe. (C) Anoism analysis of cecum microbe. (D) LDA distribution histogram of cecum microbe. 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.