Fig. 4

Differences in the relative abundance (> 0.1%) of the piglets’ ileal microbiota at the genus level. The column and its bar represented the means value and SE (n = 6), respectively. Significant difference is depicted as ^*P < 0.05 when compared with NBW-CON, ^#P < 0.05 when compared with IUGR-CON group. Streptococcus, Enterococcus, Rothia, Moraxella and Acinetobacter are all opportunistic pathogens. Thereinto, Streptococcus and Enterococcus are BSH-producing microbes. NBW-CON, piglets with normal birth weight; IUGR-CON, piglets with intrauterine growth restriction; IUGR-CB, piglets with intrauterine growth restriction supplemented with Clostridium butyricum