Fig. 6

Serum metabolite composition and function. A. OPLS-DA model chart; B. PCA analysis; C. Serum metabolite volcano plot; D. KEGG functional enrichment analysis of serum metabolites; E. Heatmap of cecum and serum correlation with tryptophan metabolites; CK, a basal diet; EO, the same diet supplemented with 20Â g per steer/day of oregano essential oil