Fig. 6

Modulation of gut microbiota by PCA at the genus level. The relative abundance of microbial genera including Prevotella 9 (a), Prevotella 2 (b), Ruminococcus torques group (c), Holdemanella (d), Megasphaera (e), Desulfovibrio (f), Roseburia (g), and Fibrobacter (h) in each group. CTL, a basal diet; AUR, a basal diet containing 50 mg/kg aureomycin; PCA, a basal diet supplemented with 0.4% protocatechuic acid. Data were shown as means ± SD (n = 6), *P < 0.05, ^#P < 0.05 compared with AUR