Table 9.

Effect of benzoic acid and thymol on caecal microbial metabolism products of piglets

Item	Treatment1				SEM	p-values
	C	BT1	BT2	BT3
14 d
Acetic acid (mg/g)	2.63	2.60	2.66	2.90	0.16	0.56
Propionic acid (mg/g)	1.22	1.29	1.18	1.50	0.09	0.11
Butyric acid (mg/g)	0.61	0.63	0.61	0.74	0.14	0.90
Total volatile fatty acid (mg/g)	4.45b	4.53b	4.45b	5.15a	0.20	0.07
NH3-N (mg/L)	433a	255b	292b	258b	30.1	<0.01
42 d
Acetic acid (mg/g)	2.18	2.17	2.34	2.76	0.24	0.32
Propionic acid (mg/g)	1.12	1.25	1.36	1.51	0.11	0.10
Butyric acid (mg/g)	0.73b	0.99ab	0.75b	1.25a	0.13	0.04
Total volatile fatty acid (mg/g)	4.03	4.41	4.45	5.52	0.40	0.10
NH3-N (mg/L)	405a	242b	257b	210b	45.0	0.04

SEM, standard error of the mean (n = 6, number of replicates).

C, control, basal diet; BT1, C+1,000 mg/kg benzoic acid+100 mg/kg thymol; BT2, C+1,000 mg/kg benzoic acid+200 mg/kg thymol; BT3, C+2,000 mg/kg benzoic acid+100 mg/kg thymol.

^a–bWithin a row, means without a common superscript differ (p<0.05 or p<0.10).