Table 4.

Analyzed composition of experimental diets (as-fed basis), Exp. 1

Item1, %	0 phytase units/kg					500 phytase units/kg
Ca carbonate source	A	B	C	D	Ca-free	A	B	C	D	Ca-free
DM	88.1	87.9	88.3	88.3	86.8	87.5	87.4	87.4	87.3	87.3
Ash	3.65	4.11	3.74	4.21	2.44	4.18	3.84	4.55	3.87	2.74
Ca	0.68	0.69	0.62	0.69	0.02	0.68	0.67	0.56	0.64	0.01
Total P	0.49	0.51	0.51	0.46	0.46	0.46	0.48	0.48	0.48	0.49
Phytate2	0.60	0.60	0.60	0.60	0.61	0.60	0.60	0.60	0.60	0.61
Phytate P3	0.17	0.17	0.17	0.17	0.17	0.17	0.17	0.17	0.17	0.17
Nonphytate P4	0.32	0.34	0.34	0.29	0.29	0.29	0.31	0.31	0.31	0.32
Phytase activity5	<50	<50	<50	<50	<50	572	644	601	546	744

¹Data are the average of duplicate analyses of one sample with the exception that data for Ca and total P are the average of four separate samples that were analyzed in duplicate.

²Phytate was calculated by dividing the analyzed phytate P by 0.282 (Tran and Sauvant, 2004).

³Phytate P values were calculated from analyzed phytate P in the ingredients.

⁴Nonphytate P was calculated as the difference between total P and phytate P.

⁵Phytase activity = phytase units/kg of diet.