Table 7.

Effects of phytase on Na, K and Mg balance in growing pigs (Exp. 2)

	Positive control	Phytase level (FTU/kg)				SEM	p-value
		0	500	1,000	20,000		Treat	Linear	Quadratic
Sodium, Na
Intake (g/d)	1.36	1.39	1.41	1.37	1.37
Digestibility (%)	89.2b	88.5b	89.8b	90.9ab	93.1a	0.83	<0.01	<0.01	0.06
Retention (g/d)	0.72	0.73	0.78	0.73	0.78	0.08	0.97	0.72	0.96
Utilization (%)	53.6	52.7	54.6	53.0	57.4	6.06	0.98	0.58	0.99
Potassium, K
Intake (g/d)	0.69	0.71	0.70	0.69	0.70
Digestibility (%)	80.7ab	76.8b	79.4b	81.9ab	86.3a	1.71	<0.01	<0.01	0.05
Retention (g/d)	0.06	0.11	0.10	0.07	0.07	0.04	0.84	0.57	0.57
Utilization (%)	8.6	15.0	15.5	10.7	9.6	5.17	0.82	0.51	0.60
Magnesium, Mg
Intake (g/d)	2.11	2.07	2.11	2.15	2.15
Digestibility (%)	26.1b	29.0ab	33.1ab	33.8ab	37.1a	2.19	0.01	0.04	0.15
Retention (g/d)	0.38b	0.42ab	0.54ab	0.56ab	0.65a	0.06	0.03	0.04	0.13
Utilization (%)	18.0b	20.1ab	25.7ab	26.0ab	30.4a	2.68	0.05	0.05	0.17

^a–dMeans in the same row with different superscripts differ (p<0.05).