“…Recent studies have demonstrated that, in pigs, the most dominant phyla were Bacteroidetes , Firmicutes , Proteobacteria and Fusobacteria [ 61 , 62 , 63 , 64 , 65 ]. Post-weaning diarrhea was associated with an increased relative abundance of Prevotella , Campylobacter , Sutterella , Roseburia , Coprococcus , Dorea and Lachnospira and Fusobacteriaceae [ 24 , 62 , 66 ], while the relative abundances of Bacteroidaceae and Enterobacteriaceae , Bifidobacterium , Bacillus , Lactobacillus and Ruminococcus declined over the weaning period [ 60 , 66 , 67 , 68 ]. Li et al [ 61 ] observed a reduction in Alloprevotella and Oscillospira bacteria population in weaned piglets [ 61 ], with both species having positive effects on the gut barrier and anti-inflammatory roles [ 69 , 70 ], not only regarding bacteria distribution, but also the functional capacities of the microbial community, in terms of short-chain fatty acids’ (SCFAs) production [ 71 ].…”