Table 8.

Breaking strength and mineral contents of tibia bone on 35-day old chicks fed wheat-based diets supplemented with phytase, xylanase, and β-glucanase

Phytase levels	Xylanase levels	β-glucanase levels	BreakStr (kg/mm2)	DM (%)	Ash (%)	Ca (%)	P (%)	Mg (%)	K (%)	S (%)
None	None	None	330.0	69.6	49.7	37.2	16.5	0.81	0.59	0.24
	Optimum	None	361.0	68.8	49.4	37.6	16.6	0.82	0.59	0.23
	None	Optimum	361.0	70.0	49.5	37.2	16.5	0.80	0.61	0.24
	Optimum	Optimum	391.5	68.9	49.8	37.1	16.4	0.81	0.57	0.26
Low	None	None	377.2	67.8	49.5	37.4	16.6	0.84	0.56	0.26
	Optimum	None	402.3	66.1	50.0	37.5	16.6	0.83	0.60	0.24
	None	Optimum	405.3	67.2	49.4	37.1	16.4	0.81	0.55	0.25
	Optimum	Optimum	408.8	66.5	49.6	36.9	16.4	0.80	0.59	0.25
Superdose	None	None	396.9	68.7	49.4	36.8	16.1	0.81	0.57	0.26
	Optimum	None	405.3	66.1	49.7	37.2	16.5	0.82	0.60	0.27
	None	Optimum	406.9	66.9	50.1	37.2	16.6	0.83	0.61	0.24
	Optimum	Optimum	412.7	65.6	49.9	36.7	16.3	0.82	0.61	0.26
SEM			5.06	0.44	0.08	0.11	0.05	0.003	0.01	0.004
Main effects
None			360.9b	69.3a	49.6	37.3	16.5	0.81	0.59	0.24
Low			398.4a	66.9b	49.6	37.2	16.5	0.82	0.58	0.25
Superdose			405.6a	66.8b	49.8	37.0	16.4	0.82	0.60	0.26
	None		379.6	68.4	49.6	37.1	16.5	0.82	0.58	0.25
	Optimum		397.0	67.0	49.7	37.2	16.5	0.82	0.59	0.25
		None	378.9b	67.8	49.6	37.3	16.5	0.82	0.58	0.25
		Optimum	397.7a	67.5	49.7	37.0	16.4	0.81	0.59	0.25
Source of variation
Phytase			0.001	0.04	0.57	0.54	0.72	0.41	0.58	0.41
Xylanase			0.06	0.13	0.44	0.94	0.98	0.91	0.43	0.48
β-Glucanase			0.04	0.70	0.48	0.30	0.73	0.09	0.74	0.89
Phytase × xylanase			0.56	0.89	0.51	0.93	0.99	0.43	0.27	0.52
Phytase × β-glucanase			0.80	0.80	0.24	0.71	0.41	0.15	0.63	0.32
Xylanase × β-glucanase			0.64	0.71	0.98	0.21	0.21	0.49	0.59	0.22
Phytase × xylanase × β-glucanase			0.87	0.93	0.35	0.83	0.42	0.76	0.88	0.99

Values are means of 6 replicates (2 birds per cage).

BreakStr, Breaking strength; DM, dry matter; SEM, standard error of means.

^a,bMean values with different superscripts within the columns are different (p<0.05).