Table 1. Composition (g/kg, as-fed basis) of the experimental diets

Ingredients	Day 1–21	Day 22–35
Corn	48.51	60.96
Wheat	8.40	4.12
Wheat bran	4.10	-
Soybean meal 48%	31.15	27.62
Vegetable oil	3.30	3.30
Limestone	1.20	0.95
Mono-calcium phosphate	1.65	1.39
Iodized alt	0.30	0.35
Vitamin-mineral premix1)	0.30	0.30
Lysine-HCI	0.34	0.30
DL-Methionine	0.20	0.19
L-Threonine	0.13	0.11
L-Cystine	0.12	0.11
Chromium oxide	0.30	0.30
Calculated values2)
Metabolizable energy (kcal/kg)	3,050	3,200
Crude protein (%)	22	20
Ca (%)	0.90	0.80
Available P (%)	0.40	0.40
Lysin (%)	1.39	1.24
Methionine (%)	0.52	0.49
Methionine + cysteine (%)	0.88	0.82
Threonine (%)	0.90	0.81
Tryptophan (%)	0.25	0.22
Valine (%)	0.97	0.89
Arginine (%)	1.34	1.19
Calculated values (SID)
Lysin (%)	1.25	1.12
Methionine (%)	0.48	0.46
Methionine + cysteine (%)	0.80	0.74
Threonine (%)	0.78	0.71
Tryptophan (%)	0.22	0.20
Isoleucine (%)	0.76	0.69
Leucine (%)	1.54	1.48
Valine (%)	0.85	0.78
Histidine (%)	0.50	0.45
Arginine (%)	1.22	1.07

Provided per kilogram of diet: vitamin A, 12,000 IU; vitamin D₃, 2,500 IU; vitamin E, 30 IU; vitamin K₃, 3 mg; D-pantothenic acid, 15 mg; nicotinic acid, 40 mg; choline, 400 mg; and vitamin B₁₂, 12 μg; Fe, 90 mg from iron sulfate; Cu, 8.8 mg from copper sulfate; Zn, 100 mg from zinc oxide; Mn, 54 mg from manganese oxide; I, 0.35 mg from potassium iodide; Se, 0.30 mg from sodium selenite.
The values were calculated according to the values of feedstuffs in NRC [16] and Ross 308 Broiler Nutrition Specification [14].
SID, standardized ileal digestibility.