Table 5.

Empty gizzard, spleen and bursa of fabricius weight relative to individual body weight (g kg⁻¹) of broilers fed diets supplemented with carbohydrases or prebiotic oligosaccharides

Diet type	Additive	Relative gizzard weight	Relative spleen weight	Relative bursa weight
Simple effect means
Wheat	Control (1)	23.3	0.8	2.2
	Xylanase 16 000 U kg−1 (2)	22.9	0.8	2.5
	Xylanase 32 000 U kg−1 (3)	21.8	0.9	2.4
	XOS (4)	20.2	0.9	1.8
Barley	Control (5)	25.5	0.9	2.6
	β‐Glucanase 16 000 U kg−1 (6)	24.1	1.1	2.0
	β‐Glucanase 32 000 U kg−1 (7)	23.7	0.9	2.2
	GOS (8)	21.8	1.0	2.1
Pooled SEM		1.09	0.10	0.15
Means for main effect of diet type
Wheat		22.0	0.8	2.2
Barley		23.8	1.0	2.2
Pooled SEM		0.54	0.05	0.07
Means for main effect of additive type
	None	24.4b	0.8	2.4
	16 000 U kg−1	23.5ab	0.9	2.2
	32 000 U kg−1	22.7ab	0.9	2.3
	Oligosaccharide	21.0a	1.0	2.0
Pooled SEM		0.77	0.07	0.10
P‐values for main effects and interaction
Diet type		0.031	0.076	0.744
Additive		0.027	0.717	0.028
Diet type × additive		0.976	0.360	0.009
P‐values for contrasts
1 vs 2				0.206
1 vs 3				0.456
1 vs 4				0.041
5 vs 6				0.178
5 vs 7				0.672
5 vs 8				0.547

Data were analysed relative to individual body weight. XOS, xylo‐oligosaccharide; GOS, galacto‐oligosaccharide; means with different subscripts within the same diet type and column are significantly different (P < 0.05).