Table 1. Ingredient composition of the experimental diet (as fed basis)

Item	Experiment 1	Experiment 2
Ingredient (g/kg)
Corn	562.0	574.1
Soybean meal (430 g/kg CP)	332.0	320.0
Soybean oil	28.2	24.7
Soy protein powder (650 g/kg CP)	36.8	41.2
Limestone	13.5	12.2
Dicalcium phosphate	19.4	19.3
L-Lysine·HCl (980 g/kg)	1.4	1.8
DL-Methionine (990 g/kg)	1.4	1.4
Trace mineral premix1)	0.1	0.1
Vitamin premix2),3)	0.2	0.2
Choline chloride (500 g/kg)	2.0	2.0
Sodium chloride	3.0	3.0
Nutrient composition
Metabolizable energy (kcal/kg)	2,975.4	2,973.0
Crude protein (g/kg)	215.1	212.3
Analyzed calcium (g/kg)	10.0	10.1
Analyzed total phosphorus (g/kg)	6.9	7.0
Non-phytate phosphorus (g/kg)	4.5	4.5
Lysine (g/kg)	11.2	11.1
Methionine (g/kg)	5.0	5.1

Trace mineral premix supplied per kg of diet: Fe (FeSO₄∙7H₂O), 80 mg; Mn (MnSO₄∙H₂O), 60 mg; Zn (ZnSO₄∙7H₂O), 40 mg; Cu (CuSO₄∙5H₂O), 6 mg; I (KI), 0.35 mg; and Se (Na₂SeO₃), 0.15 mg.
Experiment 1, vitamin premix supplied per kg of diet: vitamin A (retinyl palmitate), 4.4 mg; vitamin D₃, 25 µg (1,000 IU); vitamin E (DL-α-tocopheryl acetate), 20 mg; vitamin K₃ (menadione), 0.5 mg; vitamin B₁ (thiamine), 2 mg; vitamin B₂ (riboflavin), 8 mg; vitamin B₆ (pyridoxine), 3.5 mg; vitamin B₁₂, 0.01 mg; biotin, 0.18 mg; folic acid, 0.55 mg; pantothenic acid, 10 mg; niacin, 35 mg.
Experiment 2, vitamin premix (without supplemental VD₃) supplied per kg of diet: vitamin A (retinyl palmitate), 4.4 mg; vitamin E (DL-α-tocopheryl acetate), 20 mg; vitamin K₃ (menadione), 0.5 mg; vitamin B₁ (thiamine), 2 mg; vitamin B₂ (riboflavin), 8 mg; vitamin B₆ (pyridoxine), 3.5 mg; vitamin B₁₂, 0.01 mg; biotin, 0.18 mg; folic acid, 0.55 mg; pantothenic acid, 10 mg; niacin, 35 mg.