Taxonomic composition analysis of cecal digesta. Heatmap indicating the dominant 35 genera (y-axis) across different treatment groups (x-axis): basal diet without treatment (C), basal diet plus enramycin, (A), basal diet plus Bacillus species–fermented products (SYN), basal diet plus essential oils (EO), and basal diet plus Bacillus species–fermented products and essential oils (SYN+EO); n = 4.