Table 3.

Prececal and total tract inositol hexakisphosphate (InsP₆) disappearance, prececal and total tract nutrient digestibility in growing pigs (%)¹

Ca source	Ca formate		Ca carbonate
Exogenous phytase, FTU/kg of diet	0	1,500	0	1,500	1,500
Formic acid, g/kg of diet	0	0	0	0	8.0	P-value
Item	Diet 1	Diet 2	Diet 3	Diet 4	Diet 5	SEM	Diet 4 vs. 5	Ca source	Phytase	Ca source × Phytase
Prececal
DM	60.5	61.0	62.2	60.4	62.5	0.71	0.106	0.391	0.332	0.102
GE	67.0	67.5	68.9	67.2	68.6	0.66	0.165	0.235	0.381	0.098
N	73.3	74.3	74.1	73.2	75.6	0.86	0.078	0.888	0.937	0.143
P	19.4	52.8	22.6	55.2	60.9	1.59	0.004	0.032	<0.001	0.494
Ca	51.7	69.2	47.3	62.7	65.7	1.58	0.114	<0.001	<0.001	0.296
InsP6	9.5	77.4	15.5	80.0	87.0	2.17	0.027	0.007	<0.001	0.093
Total tract
DM	80.8	81.8	80.5	81.2	82.7	0.38	<0.001	0.105	0.002	0.653
GE	83.8	84.1	83.9	83.7	84.6	0.38	0.105	0.460	0.794	0.322
N	83.5	84.5	83.6	83.3	84.3	0.76	0.280	0.265	0.466	0.196
P	24.2	55.5	26.2	57.4	61.8	2.20	0.034	0.129	<0.001	0.830
Ca	48.4	70.3	44.4	63.3	66.0	2.68	0.203	0.001	<0.001	0.319
InsP6	97.0	98.0	97.1	98.1	98.7	0.58	0.083	0.882	0.118	0.652

¹Least square means based on 8 observations per diet.