Fig. 1.

The α- and β-diversity of ileal bacterial communities in finishing pigs in the both control and ROD polyphenol extract group. Shannon–Wiener curves of ileal microbiota of finishing pigs on day 15 were shown (A). Bacterial diversity between the control and ROD polyphenol extract groups was assessed by the Shannon index (B) and Simpson index (D). The NMDS comparative analyses of ileal bacterial community structure between the two groups on days 15 (C). Bacterial richness in the control and ROD polyphenol extract groups was estimated by the Chao1 (E) and Robs (F). Shared and unique ileal OTUs between control and ROD polyphenol extract group was indicated on Venn diagrams (G)