Table 1.

Composition and nutrient levels of basal diets (DM^a basis).

Ingredients (%)	Phase 1 (d 1 to d 21)	Phase 2 (d 22 to d 42)
Corn, 8.2 % CPa	61.74	65.17
Soybean meal, 46% CP	28.50	24.50
Fish meal, 64.7% CP	3.29	3.33
Soy oil	2.90	3.81
Dicalcium phosphate	1.30	1.20
Limestone	1.28	1.10
Salt	0.30	0.30
L-lysine HCl, 78%	0.00	0.00
DL-Methionine, 98%	0.15	0.05
L-Threonine, 98%	0.04	0.04
Vitamin-mineral premixb	0.50	0.50
Total	100	100
Nutritional levelsc
Metabolizable energy, kcal/kg	3,050.73	3,150.11
Crude protein	20.68	19.06
Calcium	1.02	0.91
Digestible phosphorus	0.43	0.40
Standardized ileal digestible lysine	0.80	0.72
Standardized ileal digestible methionine	0.27	0.25
Standardized ileal digestible threonine	0.58	0.53

^aDM, dry matter; CP, crude protein.

^bPremix provided the following per kg of feed: vitamin A, 10,000 IU; vitamin D₃, 3,000 IU; vit-amin E, 24 mg; vitamin K₃, 2.1 mg; vitamin B₁₂, 2 mg; riboflavin, 5.0 mg; pantothenic acid, 15 mg; niacin, 40 mg; choline chloride, 500 mg; folic acid, 0.9 mg; vitamin B₆, 3.0 mg; biotin, 0.05 mg; Mn (from MnSO₄·H₂O), 70 mg; Fe (from FeSO₄·H₂O), 80 mg; Zn (from ZnSO₄·H₂O), 100 mg; Cu (from CuSO₄·5 H₂O), 18.8 mg; I (from KI), 0.35 mg; Se (from Na₂SeO₃), 0.30 mg.

^cThe metabolizable energy and crude protein in nutrient levels were analyzed values, other nutrients were cacluated values.