Linear discriminant analysis effect size (LEfSe) analysis of the gut microbiota composition of sows at farrowing and d 18 of lactation. (A) At farrowing, cladogram using LEfSe method indicating the phylogenetic distribution of gut microbiota in sows among all dietary treatment. Each successive circle represents a phylogenetic level. (B) At d 18 of lactation, cladogram using LEfSe method indicating the phylogenetic distribution of gut microbiota in sows among all dietary treatment. Each successive circle represents a phylogenetic level. (C) At farrowing, histogram of the Linear Discriminant Analysis (LDA) score reveals the most differentially abundant taxa between different dietary treatment. (D) At d 18 of lactation, histogram of the LDA scores reveals the most differentially abundant taxa among different dietary treatment. CON group, sows fed diets without IMO; IMO group, sows fed diets containing 5.0 g/kg IMO; IMOS group, sows fed diets containing 5.0 g/kg IMO plus 0.2 g/kg Bacillus subtilis; IMOL group, sows fed diets containing 5.0 g/kg IMO plus 0.2 g/kg Bacillus licheniformis; IMOSL group, sows fed diets containing 5.0 g/kg IMO plus 0.2 g/kg B. subtilis and 0.2 g/kg B. licheniformis.