Fig. 4

Alpha diversity of weaned pigs gut microbiota including total observed OTU (a), Shannon index (b), and phylogenetic diversity (PD) whole tree (c). PC, sanitary environment; NC, non-sanitary environment; BP, non-sanitary environment plus bacteriophage cocktail; ZO, non-sanitary environment plus 2,500 mg/kg ZnO. ^a,bDifferent letters indicate significant difference between groups (P < 0.05)