Effects of diet on bacterial diversity (a) and relative abundances of phylotypes corresponding to Prevotella sp. (b) and Roseburia sp. (c) in the large intestine of pigs. CF80: 80 g/kg chicory forage; CF160: 160 g/kg chicory forage. Data are presented as least square means (n = 6) and standard error of the mean (SEM). ab Different letters within rows, indicate significant difference (P < 0.05).