. 2018 Oct 25;13(10):e0205913. doi: 10.1371/journal.pone.0205913

Table 5. Effect of dietary xylose concentration and collection period on diet digestibility and energy value and on nitrogen balance.

Collection period, d	5–7				12–14				19–21
Dietary treatment, % xylose inclusion	0	2	4	8	0	2	4	8	0	2	4	8	Pooled SEM	T×C¹ P-value
ATTD, %
DM^†	87.82^d ^e	88.49^a ^b ^c ^d	88.39^a ^b ^c ^d ^e	88.12^b ^c ^d ^e	88.14^c ^d ^e	89.10^a	88.89^a ^b	88.58^a ^b ^c ^d	88.70^a ^b ^c	87.56^e	88.80^a ^b^c	88.06^c ^d ^e	0.30	0.0003
GE^†	88.98^e ^f	89.45^b ^c ^e	89.43^a ^b ^c ^e ^f	89.33^b ^c ^e ^f	89.39^c ^e	90.18^a	90.05^a ^b	89.69^a ^b ^c ^e	90.00^a ^b ^d	88.62^f	90.01^a ^b^c	89.19^c ^d ^e ^f	0.29	<0.0001
CP^†	90.86	91.16	91.29	90.74	91.96	92.18	91.78	91.64	92.62	91.95	92.57	91.59	0.50	0.0858
Urine GE^*^‡^†, kJ/l	715	886	922	1209	889	1009	1144	1306	939	1043	1256	1372	70	0.5803
Diet energy value, MJ/kg, as-fed
DE^*^#^†	14.91	14.82	15.09	15.02	15.09	14.98	15.17	15.17	15.20	14.94	15.30	15.16	0.08	0.0857
ME^*^‡^†	13.81^b ^c	13.54^d ^e	13.50^e	13.00^g	13.95^b	13.74^b ^c	13.67^c ^d ^e	13.27^f	14.09^a	13.54^e	13.72^c ^d	13.14^f ^g	0.08	0.0116
Urine N^*^‡^†, %	0.28	0.31	0.20	0.21	0.43	0.39	0.33	0.29	0.50	0.44	0.41	0.34	0.03	0.0962
Nitrogen balance
Retained, % of intake	76.70	75.08	78.72	75.98	76.32	75.97	76.03	75.90	76.25	75.85	75.69	73.19	1.62	0.1497
N in feces^†, % of excreted N	59.98	63.08	58.52	61.03	65.30	66.25	64.86	66.02	67.97	66.12	69.22	69.18	2.03	0.2949
N in urine^†, % of excreted N	40.02	36.92	41.48	38.97	34.70	33.75	35.14	33.98	32.03	33.88	30.78	30.82	2.03	0.2949

Pigs (n = 12/treatment) were housed individually in metabolism crates and fed diets containing either 0, 2, 4, or 8% D-xylose at 4% of BW. Feces and urine were collected during 3 different periods representing increasing adaptation time to treatment diets.

ATTD, apparent total tract digestibility; GE, gross energy; CP, crude protein; ME, metabolizable energy; N, nitrogen

^a-gWithin a row, means without a common superscript differ (P ≤ 0.05)

¹Dietary treatment × collection period interaction (T×C)

*Treatment is significant at P < 0.01

^#Treatment linear contrast is significant at P < 0.05

^‡Treatment linear contrast is significant at P < 0.01

^†Collection period is significant at P < 0.01