Table 2. Composition of the experimental diets (% as-fed basis) in the laying phase

Ingredient	Diets
Ingredient	Week 18—28	Week 29—64
Corn	58.20	61.46
Soybean meal	22.78	20.42
Corn gluten meal	4.53	5.00
Soybean oil	2.50	1.26
Monocalcium phosphate	1.38	1.21
Limestone	9.65	10.00
Salt	0.25	0.25
L-lysine	0.20	0.03
DL-methionine	0.21	0.07
Vitamin-mineral premix¹	0.30	0.30
Chemical composition
Metabolizable energy (kcal/kg)	2,859	2,800
Crude protein (%)	18.20	17.50
Calcium (%)	4.10	4.20
Available phosphorus (%)	0.40	0.37

Vitamin and mineral mixture provided the following nutrients per kg of diet: vitamin A, 24,000 IU; vitamin D₃, 6,000 IU; vitamin E, 30 IU; vitamin K, 4 mg; thiamin, 4 mg; riboflavin, 12 mg; pyridoxine, 4 mg; folacin, 2 mg; biotin, 0.03 mg; vitamin B8 0.06 mg; niacin, 90 mg; pantothenic acid, 30 mg; Fe, 80 mg (as FeSO₄․H₂O); Zn, 80 mg (as ZnSO₄․H₂O); Mn, 80 mg (as MnSO₄․H₂O); Co, 0.5 mg (as CoSO₄․H₂O); Cu, 10 mg (as CuSO₄․H₂O); Se, 0.2 mg (as Na₂SeO₃); I, 0.9 mg (as Ca(IO₃)․2H₂O).