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Solid-state fermentation of feedstuffs by  Bacillus subtilis  MA139 can reduce insoluble dietary fiber content  in vitro  and improve growth performance in pigs. This study was conducted to investigate the effects of dietary corn bran (CB) fermented by  B. subtilis  on growth performance and gut microbiota composition in finishing pigs. A total of 60 finishing pigs were allocated to 3 dietary treatments consisting of a control (CON) diet, a 10% CB diet, and a 10% fermented CB (FCB) diet in a 21 d feeding trial. Growth performance and nutrient digestibility were evaluated. Fecal samples were determined for bacterial community diversity by 16S rRNA gene amplicon sequencing. The dietary CB and FCB did not affect growth performance of finishing pigs. The digestibility of organic matter was decreased in both CB and FCB treatments compared with CON group ( P  < 0.05). The α-diversity for bacterial community analysis of Chao 1 in FCB treatment was lower than CON treatment ( P  < 0.05). The  Fibrobacteres  phylum belongs to cellulolytic bacteria was isolated, and their relative abundance in CB group showed no difference between CON and FCB treatments. The abundance of  Lachnospiraceae_NK4A136_group  in CB treatment was higher than CON and FCB groups ( P  < 0.05), whereas the population of  norank_f_Prevotellaceae  was higher in FCB group compared to CON and CB groups ( P  < 0.05). In conclusion, dietary FCB decreased the abundance of bacterial communities, particularly the population of bacteria related to cellulolytic degradation.

Dietary Corn Bran Fermented by Bacillus subtilis MA139 Decreased Gut Cellulolytic Bacteria and Microbiota Diversity in Finishing Pigs