Table 1.

Composition of experimental diets, “as-fed basis”

Item	Phase 1	Phase 2
Corn, yellow dent	33.4	39.3
Wheat, hard red winter	10.0	10.0
Poultry fat	1.00	1.00
Soybean meal, 47.5% CP	22.6	16.7
l-Lysine HCl	0.29	0.31
Salt	0.50	0.50
Limestone	1.48	1.41
Mono-calcium phosphate, 21% P	0.12	0.00
Vitamin and mineral premix1	0.50	0.50
Corn DDGS2	30.0	30.0
Phytase3	0.04	0.04
Titanium dioxide	—	0.30
Calculated provisions
DM, %	89.2	89.2
Net energy, kcal/kg	2,380	2,417
CP, %	23.4	21.0
NDF, %	15.7	15.8
Crude fiber, %	4.11	4.04
Crude fat, %	6.15	6.20
SID Lys, %	1.08	0.95
SID Thr, %	0.68	0.60
SID Met, %	0.35	0.32
SID Met + Cys, %	0.66	0.60
SID Try, %	0.20	0.17
Ca, %	0.70	0.63
Total P, %	0.52	0.47
STTD P, %	0.32	0.30

¹Provided per kilogram of complete diet: vitamin A, 10,000 IU as retinyl acetate; vitamin D₃, 1,000 IU as cholecalciferol; vitamin E, 40 IU as DL-α-tocopherol acetate; vitamin K, 2.5 mg as menadione; pantothenic acid, 15 mg; riboflavin, 5 mg; choline, 500 mg; folic acid, 2.0 mg; niacin, 25 mg; thiamine, 1.5 mg; pyridoxine, 1.5 mg; vitamin B₁₂, 25 µg; biotin, 200 µg; Cu, 15 mg from CuSO₄ × 5H₂O; Fe, 100 mg from FeSO₄; Mn, 20 mg from MnSO₄; Zn, 105 mg from ZnO; Se, 0.30 mg from Na₂SeO₃; and I, 0.5 mg from KI (DSM Nutritional Products Canada Inc., ON, Canada).

²DDGS = distillers dried grains with solubles.

³ Buttiauxella spp. Phytase supplied 750 FTU/kg (Axtra PHY, Danisco UK Ltd, Marlborough, UK).