Table 4.

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

Phase	1		2		3		4		5
Treatment1	PC	NC	PC	NC	PC	NC	PC	NC	PC	NC
ME, Mcal/kg	3.40	3.36	3.40	3.36	3.39	3.36	3.39	3.36	3.39	3.35
NE, Mcal/kg	2.57	2.53	2.60	2.56	2.60	2.57	2.62	2.58	2.62	2.59
Crude protein, %	18.48	18.24	15.91	15.74	15.33	15.21	14.03	13.95	14.03	13.95
SID lysine, %	1.05	0.89	0.87	0.74	0.80	0.68	0.66	0.56	0.60	0.51
SID methionine, %	0.32	0.24	0.26	0.21	0.22	0.21	0.19	0.19	0.19	0.19
SID total sulfur amino acids, %	0.59	0.51	0.49	0.45	0.45	0.44	0.41	0.41	0.39	0.40
SID threonine, %	0.64	0.55	0.54	0.47	0.51	0.45	0.44	0.41	0.42	0.39
SID tryptophan, %	0.21	0.19	0.18	0.15	0.16	0.15	0.14	0.13	0.12	0.12
Calcium, %	0.52	0.52	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50
P, %	0.56	0.57	0.53	0.53	0.53	0.53	0.52	0.52	0.52	0.52
Standardized total tract digestible P, %2,3	0.31	0.32	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30
Ca:STTD P ratio	1.68	1.63	1.67	1.67	1.67	1.67	1.67	1.67	1.67	1.67

¹The NC was formulated to contain 12% less SID lysine with relative lowering of all other AA, plus 0.75 percentage points less added fat; AA values derived from internal database of ingredients which is based on prior AA assay.

²Analyzed phytase levels averaged across phases within treatment: PC, 950 FTU phytase/kg; NC, 1,264 FTU phytase/kg; formulated 1,000 FTU phytase/kg, analyzed 1,500 FTU phytase/kg; formulated 1,750 FTU phytase/kg, analyzed 2,280 FTU phytase/kg; formulated 2,500 FTU phytase/kg, analyzed 2,500 FTU phytase/kg.

³All diets contained sufficient phytase to ensure the diets met or exceeded the pig’s requirement for STTD P, according to NRC (2012). Quantum Blue 5G added at 0.005% of the diet provided at least 250 FTU phytase/kg which was assumed to release 0.08% STTD P. As the analyzed phytase levels were considerably higher than expected due to higher levels of phytase in the premix, there can be no question that the super-dosing effect is not due to meeting the pig’s P requirement.