Table 6.

Concentrations of inorganic P (P_i), calcium (Ca), alkaline phosphatases (ALP), urea nitrogen (BUN), and myo-inositol in the blood of pigs¹

Dietary Ca, g/kg DM	5.5		8.5		SEM	P-value
Exogenous phytase, FTU/kg of diet	0	1,500	0	1,500		Calcium	Phytase	Calcium × phytase
Pi, mmol/L	2.6b	3.4a	2.1c	3.2a	0.14	<0.001	<0.001	0.037
Ca, mmol/L	3.1b	3.0c	3.5a	3.1b	0.04	<0.001	<0.001	<0.001
ALP, U/L	253	232	237	224	34.67	0.950	0.051	0.767
ALP2, U/L	209	192	219	200	11.0	0.181	0.016	0.917
Myo-inositol, µg/mL	9.4	17.2	8.6	17.4	0.96	0.407	<0.001	0.499
BUN, mg/dL	21.5	17.9	19.6	18.3	2.07	0.269	0.002	0.065

¹Least squares means based on eight observations per diet.

²Least squares means without one pig that had a 2.2-fold higher ALP activity than the mean of the other pigs.

^a,b,cWithin a row, individual treatment means without a common superscript differ significantly (P < 0.05).