Table 4.

Effects of the experimental diets on bacterial metabolites in digesta and feces of weaned piglets ¹.

Concentration, µmol/g DM	Diet					p-Value
	W-SBM	W-RSM	R-SBM	R-RSM	SEM	CER	PM	CER * PM
Jejunum
SCFA	89.6	30.8	192	104	13.6	<0.001	0.001	0.511
Acetic acid	79.0	27.8	172	96.1	12.1	<0.001	0.002	0.517
Propionic acid	0.47	0.68	3.60	1.26	0.43	0.024	0.188	0.115
i-butyric acid	1.33	0.94	1.42	1.33	0.11	0.288	0.286	0.509
n-butyric acid	8.43	1.12	14.0	5.51	1.58	0.097	0.010	0.845
i-valeric acid	0.08	0.00	0.27	0.03	0.05	0.195	0.072	0.353
n-valeric acid	0.24	0.28	0.36	0.28	0.03	0.351	0.709	0.342
Ammonia	37.9	29.7	53.7	37.8	3.4	0.073	0.070	0.551
l-lactate	177	213	303	133	32	0.717	0.295	0.112
d-lactate	5.64	9.83	8.92	7.15	2.04	0.944	0.775	0.483
Colon ascendens
SCFA	990	922	1316	1040	48	0.016	0.057	0.244
Acetic acid	536	489	743	566	30	0.014	0.049	0.243
Propionic acid	251	236	314	280	12	0.034	0.323	0.706
i-butyric acid	11.0	9.56	14.2	9.78	0.48	0.036	0.001	0.064
n-butyric acid	153	141	191	143	7	0.172	0.041	0.197
i-valeric acid	10.9	8.58	13.9	7.61	0.74	0.430	0.002	0.133
n-valeric acid	28.9	37.0	39.9	33.7	2.3	0.402	0.836	0.124
Ammonia	51.5	52.9	65.5	41.5	3.6	0.849	0.116	0.078
l-lactate	22.4	34.1	40.8	28.4	3.9	0.425	0.965	0.133
d-lactate	7.69	11.0	9.17	7.80	1.31	0.754	0.723	0.390
Feces 2
SCFA	592	529	688	571	34	0.308	0.187	0.694
Acetic acid	283	257	358	291	17	0.112	0.171	0.537
Propionic acid	154	133	163	140	9	0.642	0.236	0.972
i-butyric acid	15.1	15.9	21.6	15.6	1.0	0.106	0.168	0.079
n-butyric acid	97.1	80.8	93.2	81.3	6.5	0.898	0.296	0.870
i-valeric acid	21.0	21.5	31.0	21.5	1.4	0.065	0.094	0.063
n-valeric acid	22.7	20.8	21.9	22.0	1.3	0.943	0.755	0.711
Ammonia	78.4	84.5	86.0	78.1	5.6	0.958	0.939	0.552
l-lactate	12.0	19.2	12.9	15.5	2.0	0.714	0.223	0.562
d-lactate	6.42	11.7	6.45	10.0	1.45	0.778	0.135	0.770

DM, dry matter; W-SBM, wheat/soybean meal; W-RSM, wheat/rapeseed meal; R-SBM, rye/soybean meal; R-RSM, rye/rapeseed meal; SEM, standard error of the mean; CER, cereal; PM, protein meal; SCFA, short-chain fatty acids; ¹ Data are presented as means (n = 11); p-values indicate effects of the factors cereal (CER), protein meal (PM), and their interaction (CER * PM). ² R-SBM: n = 10 (lack of collectable feces).