Table 1. The composition of the basal diet.

Composition	Content (%)	Nutrient	Content (%)
Corn	51.95	Crude protein (CP)	21.5
Soybean	39.5	Methionine (Met)	0.5
Rapeseed oil	4.1	Calcium (Ca)	1
dl-Methionine	0.2	All phosphorus (P)	0.7
Calcium hydrogen phosphate	1.85	Methionine + Cystine (Met + Cys)	0.84
Calcium carbonate	1.3	Lysine (Lys)	1.15
Sodium chloride	0.4	Threonine (Thr)	0.83
Trace element premix a	0.5	Metabolizable energy (ME) (MJ kg–1)	12.52
Choline	0.17
Multivitamins b	0.03
Total	100

^aTrace element premix (mg kg^–1): FeSO₄·7H₂O, 530; CuSO₄·5H₂O, 30; MnSO₄·H₂O, 400; ZnSO₄·7H₂O, 470; KI, 18; NaSeO₃, 0.3.

^bMultivitamins: Vitamin A, 13 500 IU kg^–1; Vitamin D, 3000 IU kg^–1; Vitamin E, 24 IU kg^–1; Vitamin K3, 3 mg kg^–1; pantothenic acid, 15 mg kg^–1; folic acid, 1.05 mg kg^–1; nicotinamide, 30 mg kg^–1; biotin, 0.14 mg kg^–1.