Table 3.

Analyzed nutrient concentrations in experimental diets

Item, %	Calcium carbonate		Ca free		Conventional diet1
Phytase units/kg:	0	500	0	500
ME2	3,318	3,318	3,391	3,391	3,299
DM	87.73	88.05	87.53	87.34	87.39
CP	12.7	12.6	13.0	13.1	12.5
Ash	4.58	5.27	3.34	3.13	5.42
NDF	6.39	5.65	6.42	7.13	9.96
ADF	1.33	1.25	1.41	2.16	4.44
Acid hydrolyzed ether extract	2.35	2.36	2.68	2.45	2.06
Ca	0.87	0.89	0.02	0.01	0.86
Total P	0.55	0.54	0.52	0.53	0.49
Phytase activity, phytase units/kg	<50	687	<50	587	<50
Phytate3, %	0.65	0.65	0.67	0.67	0.78
Phytate-bound P4, %	0.18	0.18	0.19	0.19	0.22
Phytate-bound P, % of total P	34.55	35.19	36.54	35.85	42.65
Nonphytate P5, %	0.36	0.35	0.33	0.34	0.28

¹The conventional gestation diet was fed to gestating sows before and between collection periods and this diet did not contain any exogenous phytase.

²Values for ME were calculated rather than analyzed (NRC, 2012).

³Phytate was calculated by dividing the analyzed phytate-bound P by 0.282 (Tran and Sauvant, 2004).

⁴Phytate values were calculated from analyzed phytate in the ingredients.

⁵Nonphytate P was calculated as the difference between total P and phytate-bound P.