Table 3.

Prececal, total tract, and hindgut InsP₆ disappearance, prececal and total tract digestibility, hindgut disappearance (HD), and retention of P and Ca by growing 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		Ca	Phytase	Ca × phytase
InsP6
Prececal disappearance, %	21.9c	89.6a	22.7c	84.8b	1.42	0.068	<0.001	0.022
Total tract disappearance, %	95.9	98.5	87.0	96.0	3.34	0.002	0.023	0.988
HD, µmol/g DM	11.5a	1.4c	9.6b	1.7c	0.59	0.368	<0.001	0.045
P
Prececal digestibility, %	22.9c	63.5a	25.9b	60.1a	1.37	0.840	<0.001	0.009
Total tract digestibility, %	28.2	61.2	26.3	58.6	1.51	0.086	<0.001	0.906
HD, g/kg DM	0.3	-0.1	0.0	-0.1	0.07	0.164	0.101	0.621
Intake, g/d	6.5	6.5	6.5	6.4	0.83	—	—	—
In feces, g/d	4.6	2.5	4.8	2.7	0.47	0.054	<0.001	0.792
In urine, mg/d	17b	355a	16b	18b	54	<0.001	<0.001	<0.001
Retention, g/d	1.8	3.6	1.6	3.8	0.37	0.703	<0.001	0.134
Ca
Prececal digestibility, %	48.9c	72.0a	49.6c	64.2b	2.13	0.017	<0.001	0.007
Total tract digestibility, %	47.3c	71.2a	46.9c	63.9b	2.62	0.024	<0.001	0.038
HD, g/kg DM	-0.1	0.0	-0.2	0.0	0.10	0.662	0.166	0.645
Intake, g/d	7.3	7.3	11.6	11.4	1.21	<0.001	0.548	0.593
In feces, g/d	3.9	2.1	6.3	4.1	0.66	<0.001	<0.001	0.055
In urine, g/d	1.6b	0.3c	3.0a	1.7b	0.21	<0.001	<0.001	0.002
Retention, g/d	1.8	4.9	2.3	5.6	0.53	0.004	<0.001	0.650
Urinary myo-inositol excretion, mg/d	23	38	23	60	15	0.004	<0.001	0.440

¹Least squares means based on eight observations per diet.

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