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Heatmap of cecal microbiome in the broilers of the tannic acid 0 (TA0): basal diet without tannic acid; 2) tannic acid 0.5 (TA0.5): basal diet with 0.5 g/kg tannic acid; 3) tannic acid 1.5 (TA1.5); and 4) tannic acid 2.5 (TA2.5) groups on D 21.
