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PCoA analysis based on unweighted UniFrac distance and ANOSIM analysis. Group CK: basal diet; Group I: basal diet added with 150 mg/kg HGT; Group Ⅱ: basal diet added with 300 mg/kg HGT; Group Ⅲ: basal diet added with 450 mg/kg HGT. Abbreviations: ANOSIM, analysis of similarities; ASV, amplicon sequence variants; PCoA, principal coordinates analysis.
