Table 3.

Ingredient composition and calculated nutrient profile of dietary treatments (experiment 2)

	Phytase inclusion levels, FTUa/kg
Ingredients	0	250	500	750	1,000	1,500	2,000
Corn, yellow dent	71.86	71.66	71.66	71.66	71.66	71.66	71.66
Soybean meal, 47.5% CP	25.00	25.00	25.00	25.00	25.00	25.00	25.00
Choice white grease	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Limestone	0.63	0.63	0.63	0.63	0.63	0.63	0.63
Salt	0.30	0.30	0.30	0.30	0.30	0.30	0.30
Vitamin premixb	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Trace mineral premixb	0.25	0.25	0.25	0.25	0.25	0.25	0.25
Phytase premixc	0.00	0.20	0.20	0.20	0.20	0.20	0.20
TiO2	0.40	0.40	0.40	0.40	0.40	0.40	0.40
l-Lysine HCl	0.30	0.30	0.30	0.30	0.30	0.30	0.30
MHAd	0.08	0.08	0.08	0.08	0.08	0.08	0.08
l-Threonine	0.13	0.13	0.13	0.13	0.13	0.13	0.13
Total	100	100	100	100	100	100	100
Calculated nutrient composition
MEe, kcal/kg	3390	3390	3390	3390	3390	3390	3390
CPe, %	18.33	18.33	18.33	18.33	18.33	18.33	18.33
SIDf, %
Lys	1.03	1.03	1.03	1.03	1.03	1.03	1.03
Thr	0.68	0.68	0.68	0.68	0.68	0.68	0.68
Met	0.33	0.33	0.33	0.33	0.33	0.33	0.33
Met + Cys	0.58	0.58	0.58	0.58	0.58	0.58	0.58
Trp	0.18	0.18	0.18	0.18	0.18	0.18	0.18
Ca, %	0.32	0.32	0.32	0.32	0.32	0.32	0.32
Total P, %	0.37	0.37	0.37	0.37	0.37	0.37	0.37
STTDg P, %	0.15	0.15	0.15	0.15	0.15	0.15	0.15
Phytate P, %	0.24	0.24	0.24	0.24	0.24	0.24	0.24

^aFTU, phytase units per kg complete diet.

^bThe vitamin premix supplied the following nutrients per kilogram of diet: vitamin A, 6,600 IU; vitamin D, 1,210 IU; vitamin E, 33 IU; vitamin K, 3.3 mg; riboflavin, 5.72 mg; niacin, 39.6 mg; pantothenic acid, 19.8 mg; vitamin B12, 26.4 µg; the trace mineral premix supplied the following nutrients per kilogram of diet: Zn, 120 mg as zinc sulphate; Cu, 12 mg as copper; Mn, 30 mg as manganese sulphate; Fe, 80 mg as ferrous sulphate; I, 0.4 mg as ethylenediamine dihydriodide; Se, 0.3 mg as sodium selenite.

^cSix phytase premixes were prepared by mixing ground corn and phytase (CIBENZA PHYTAVERSE G10, Novus International, Inc., St. Charles, MO) to provide 250, 500, 750, 1,000, 1,500, or 2,000 FTU/kg in the complete diets, respectively.

^dMHA is dry calcium salt of d,l-2-hydroxy-4-(methylthio)butanoic acid (84% Met activity, MHA, Novus International, Inc., St. Charles, MO).

^eME and CP represented metabolizable energy and crude protein, respectively.

^fSID, standardized ileal digestible.

^gSTTD, standardized total tract digestible.