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Castration changed the cecal microbiota functions between the bull and steer groups. (A) The top 15 different KEGG metabolic pathways. (B) The top 15 different CAZyme profiles. (C) The Spearman correlation heatmap between the growth performance, serum parameters, digestive enzymes, and cecal differential microbiota (|r| > 0.7). n = 6 individuals/group; * P < 0.05; ** P < 0.01. ADG, average daily gain; FBW, final body weight; DMI, dry matter intake; G/F, feed efficiency.
