Table 8.

Effect of dietary treatment and period on colon digesta short-chain fatty acid concentrations (mmol/L)

	Treatmenta				Period			P-value
Item	NC	BZA	BC50	AGP	1	2	SEM3	Treatment	Period	Treatment × Period
Acetate	39.5	48.8	44.8	41.9	49.8	37.6	8.2	0.10	< 0.001	0.26
Propionate	27.4	33.9	28.5	28.9	33.1	26.2	5.6	0.19	0.004	0.54
Butyrate	12.5	15.8	15.0	13.4	15.3	13.0	2.7	0.38	0.13	0.31
Valerate	3.5	4.7	4.2	2.8	4.2	3.4	0.6	0.07	0.12	0.15
Total SCFA	82.8	103.2	92.5	86.9	102.4	80.3	16.7	0.13	< 0.001	0.29
Acetate acid: Total SCFA	0.48	0.48	0.49	0.50	0.49	0.48	0.01	0.72	0.43	0.45
Propionate: Total SCFA	0.33	0.33	0.31	0.32	0.32	0.32	0.01	0.31	0.71	0.16
Butyrate: Total SCFA	0.14	0.15	0.16	0.15	0.15	0.16	0.01	0.33	0.09	0.40

^aPigs were fed experimental diets at weaning (28 d age) for 21 d. Treatments: NC: negative control (no additive); BZA, : benzoic acid (0.60%); BC50: Benzocal-50 (0.20%); AGP: antibiotic growth promoter (Carbadox, 50 ppm). Period: period 1 = 7 d; period 2 = 14 d.

²Maximum value for the standard error of the mean.

^*,†Means without a common superscript differ after Tukey multiple comparison test, P < 0.05.