Table 2.

Calculated nutrient composition of experimental diets, experiment 1 (as-fed basis)^1,2

Phase	1		2		3		4
Treatment	PC	NC	PC	NC	PC	NC	PC	NC
ME, Mcal/kg	3.33	3.28	3.33	3.28	3.33	3.26	3.33	3.28
NE, Mcal/kg	2.39	2.35	2.42	2.39	2.45	2.41	2.49	2.46
Crude protein, %	23.01	22.21	21.26	20.38	19.69	18.79	18.27	17.42
SID lysine, %	1.44	1.31	1.38	1.24	1.30	1.17	1.18	1.06
SID methionine, %	0.54	0.47	0.52	0.45	0.48	0.41	0.42	0.36
SID total sulfur amino acids, %	0.84	0.83	0.86	0.78	0.81	0.73	0.74	0.67
SID threonine, %	0.94	0.86	0.90	0.81	0.85	0.78	0.77	0.69
SID tryptophan, %	0.26	0.25	0.24	0.23	0.22	0.21	0.20	0.19
Calcium, %	0.85	0.85	0.75	0.75	0.69	0.69	0.62	0.61
P, %	0.81	0.81	0.72	0.71	0.66	0.66	0.59	0.58
Standardized total tract digestible P, %	0.50	0.50	0.41	0.41	0.34	0.34	0.32	0.31
Ca:STTD P ratio	1.69	1.69	1.82	1.82	1.99	1.99	1.96	1.97

¹The NC was achieved by reducing SID lysine by 10% with proportional lowering of all other essential AA, plus reducing added fat by 1 percentage point; AA values were derived from internal database of ingredients which is based on prior AA assay.

²Diets formulated to contain 0 FTU phytase/kg were found upon assay to contain 0 FTU/kg.; all diets formulated to contain 2,500 FTU phytase/kg were found to contain an average of 3,091 FTU/kg.