At 0 h, the Lactobacillus concentration of the HDLP group and the Bifidobacterium spp. content of the MDLP group was significantly higher (P < 0.05) compared to the CONT group. Meanwhile, the Bacteroidetes level in the LDLP, MDLP, and HDLP group and the Enterobacteriaceae level in the MDLP decreased (P < 0.05). At 24 h, the Enterobacteriaceae concentration in the ETEC group grew (P < 0.05) relative to those of the other groups. At 144 h, all bacterial concentrations apart from Bacteroidetes and Lactobacillus did not considerably vary among the groups (Figure 7).