Table 4.

Coefficients of total tract retention of nutrients from broilers fed diets supplemented with carbohydrases or prebiotic oligosaccharides

Diet type	Additives	DM	Gross energy	N
Simple effect means
Wheat	Control (1)	0.70	0.72	0.68
	Xylanase 16 000 U kg−1 (2)	0.71	0.76	0.66
	Xylanase 32 000 U kg−1 (3)	0.73	0.76	0.71
	XOS (4)	0.69	0.73	0.66
Barley	Control (5)	0.67	0.72	0.69
	β‐Glucanase 16 000 U kg−1 (6)	0.63	0.70	0.62
	β‐Glucanase 32 000 U kg−1 (7)	0.66	0.72	0.69
	GOS (8)	0.72	0.72	0.67
Pooled SEM		0.008	0.007	0.012
Means for main effect of diet type
Wheat		0.71	0.73	0.68
Barley		0.67	0.71	0.67
Pooled SEM		0.004	0.004	0.006
Means for main effect of additive type
	None	0.69	0.70	0.68bc
	16 000 U kg−1	0.67	0.72	0.64a
	32 000 U kg−1	0.70	0.74	0.70c
	Oligosaccharide	0.71	0.73	0.67b
Pooled SEM		0.006	0.005	0.008
P‐values for main effects and interaction
Diet type		<0.001	<0.001	0.162
Additive		<0.001	0.179	<0.001
Diet type × additive		<0.001	0.004	0.116
P‐vales for contrasts
1 vs 2		0.430	0.004
1 vs 3		0.005	0.004
1 vs 4		0.710	0.438
5 vs 6		<0.001	0.102
5 vs 7		0.382	0.894
5 vs 8		<0.001	0.537

DM, dry matter; N, nitrogen content; XOS, xylo‐oligosaccharide; GOS, galacto‐oligosaccharide; means with different subscripts within the same diet type and column are significantly different (P < 0.05).