Table 1.

Composition and nutrient composition of basal ration (air-dried level).

Items	Age (d)
	1–28	29–56
Ingredients (air-dried basis, %)
Corn	54.4	53
Soybean meal	23.6	16
Expanded soybean	5	3
Rice distiller’s grains	5	8
Rice bran	/	8
Corn bran	/	2
Soybean oil	2.2	4.5
Limestone	1.5	1.9
Fermented soybean meal	2.5	/
High grade corn gluten meal	2.0	/
Calcium hydrogen phosphate	2.0	1.8
NaCl	0.3	0.3
Premix feed	1.5	1.5
Total	100.00	100.00
Nutritional level
Metabolic energy (kcal/kg)	2983	3090
Crude protein (%)	20.4	17.2
Lysine (%)	1.18	0.96
Methionine (%)	0.55	0.44
Methionine + cysteine (%)	0.90	0.74
Tryptophan (%)	0.22	0.20
Threonine (%)	0.88	0.78
Calcium (%)	0.86	0.73
Total phosphorus (%)	0.70	0.71
Nonphytate phosphorus (%)	0.43	0.44

The following substances are supplied per kilogram of diet: Vitamin A, 10,000 IU; Vitamin D₃ 2500 IU; Vitamin E, 20 mg; Vitamin K, 3.5 mg; Vitamin B₁, 1.5 mg; Vitamin B₂, 3.5 mg; Vitamin B₆, 3 mg; Vitamin B₁₂, 10 μg; Pantothenic acid, 10 mg; Niacin, 30 mg; Biotin, 0.15 mg; Choline chloride, 1000 mg; Iron, 80 mg; Copper, 8 mg; Manganese, 60 mg; Zinc, 60 mg; Selenium, 0.15 mg; Iodine, 0.18 mg. “/” means that the substance is not added.