Fecal short-chain fatty acids (SCFAs) concentration in Sprague-Dawley rats fed with different diets for 7 weeks^a,b.

Group	CO	PL	PM	PH	PHer
Total SCFAs*	34.37 ± 1.87d	47.57 ± 1.18c	72.27 ± 4.29b	112.8 ± 0.5a	108.4 ± 3.1a
Acetate	25.61 ± 1.46c	34.70 ± 1.14c	56.08 ± 3.82b	85.43 ± 0.38a	72.62 ± 1.60a
Propionate	4.89 ± 0.35d	7.11 ± 0.02cd	10.06 ± 0.49bc	13.02 ± 0.06b	17.95 ± 1.52a
Butyrate	1.83 ± 0.17c	2.05 ± 0.02c	2.04 ± 0.06c	8.43 ± 0.03b	12.60 ± 1.49a
Total BCFAs	2.04 ± 0.06c	3.72 ± 0.04b	4.09 ± 0.04b	5.90 ± 0.02a	5.18 ± 0.36a
Iso-butyrate	0.95 ± 0.04c	1.38 ± 0.02b	1.66 ± 0.05ab	1.98 ± 0.00a	1.56 ± 0.11b
Valerate	0.33 ± 0.03c	0.80 ± 0.03b	0.66 ± 0.07b	1.67 ± 0.02a	1.66 ± 0.13a
Iso-valerate	0.76 ± 0.03d	1.54 ± 0.01c	1.78 ± 0.05bc	2.25 ± 0.00a	1.96 ± 0.12ab

^aCO: rats fed with an AIN-93 G diet; PL–PHer: rats separately fed with a low, medium, high or higher concentration of potato diet.

^bSCFAs: short chain fatty acids; BCFAs: branched-chain fatty acids. Data are shown as mean ± SEM. Means with different letters (a, b, c and d) within columns indicate significant differences (Bonferroni's test, P < 0.05), where a > b > c > d. * μmol per g of dry weight.