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The alpha diversity index of microbial in cecum of broilers. (A) Observed species in cecum. (B) PD whole tree in cecum. (C) Shannon index of cecum microbe. (D) Chao1 index 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.
