Table 6.

Effect of sodium sources and phytase supplementation on apparent ileal nutrient and energy digestibility in 21-day-old broiler chickens (%).¹

Treatment		Dry matter	Nitrogen	Phosphorus	Calcium	Potassium	Energy	Digestible energy, kcal/kg
Positive control (PC)		72.0*	83.0	50.4	49.3	90.7	73.2	3,229*
Sodium	Phytase
NaCl		72.0	83.1	64.3	53.3	89.2	73.1	3,257
NaCl + NaHCO3		71.9	83.5	62.8	53.1	89.4	73.0	3,249
	0	71.1	81.2	51.5	56.7	89.7	71.6	3,188
Phytase	500	71.7	83.0	59.9	50.8	89.9	72.8	3,241
	1,000	72.5	84.1	67.2	52.3	89.0	73.9	3,289
	2,000	72.6	84.9	75.6	53.0	89.3	74.0	3,295
NaCl	0	71.1*	80.7*	52.3*	57.7*	90.3	70.9	3,158
NaCl	500	72.1	82.7*	60.4	50.1	89.1	73.1	3,255
NaCl	1,000	72.7	84.0	68.4	50.9*	88.4*	74.5*	3,319*
NaCl	2,000	72.2*	85.0*	76.2*	54.4	88.8	74.0	3,297
NaCl + NaHCO3	0	71.1	81.7*	50.8	55.7	89.2*	72.3	3,219
NaCl + NaHCO3	500	71.4	83.3*	59.4*	51.5	88.7	72.6	3,228
NaCl + NaHCO3	1,000	72.2	84.1	65.9*	53.7*	89.7*	73.2	3,258
NaCl + NaHCO3	2,000	73.0*	84.9*	75.1*	51.6	89.8*	74.0*	3,293*
SD2		2.05	1.10	3.99	5.78	2.13	2.43	108.3
		Probability
Contrast	PC vs. 0 phy3	3,887	0.001	0.606	0.015	0.369	0.201	0.935
Trend for main effect
Linear	Phytase	-	<0.001	<0.001	-	-	-	-
Quadratic	Phytase	-	0.004	0.010	-	-	-	-
Sodium		0.624	0.246	0.220	0.924	0.773	0.903	0.803
Phytase		0.311	<0.001	<0.001	0.115	0.812	0.083	0.083
Sodium × phytase		0.834	0.718	0.970	0.620	0.517	0.588	0.588

¹Means represents 6 replicate cages except for values with an asterisk (*) where n was 5 per treatment.

²Standard deviation.

³Contrast between the positive control and diets containing 0 FTU phytase/kg diet.