Table 3.

Chemical analysis of diets (as-fed basis; Exp. 2)¹

	STTD P2, %
Item, %	0.30	0.33	0.38	0.43	0.48	0.53	0.58
Dry matter	88.42	88.53	89.20	88.83	88.90	88.51	88.60
Crude protein	18.23	19.68	20.40	19.60	20.60	19.20	19.23
Ether extract	2.30	2.03	2.05	2.23	2.33	2.15	2.13
Ash	3.62	3.96	4.52	4.57	4.55	4.76	5.11
Calcium	0.54	0.61	0.65	0.79	0.77	0.83	0.95
Phosphorus	0.33	0.42	0.46	0.52	0.58	0.60	0.66

¹A representative sample of each diet was collected from 6 feeders, homogenized, and then analyses were conducted on composite samples (Ward Laboratories, Inc., Kearney, NE). Low (0.30% STTD P) and high (0.58% STTD P) diets were blended at the farm by a robotic feeding system to create the 0.33%, 0.38%, 0.43%, 0.48%, and 0.53% STTD P dietary treatments. A composite sample of the low (0.30% STTD P) and high (0.58% STTD P) diets was analyzed for phytase activity in duplicate (New Jersey Feed Laboratory Inc., Trenton, NJ). The analyzed phytase activity in the mixed diets was 1,760 and 1,755 FYT/kg, respectively.

²STTD P = standardized total tract digestible phosphorus.