Table 1.

Ingredient and calculated nutrient composition of basal diet, as-fed basis^a

Ingredient	Content, %	Calculated nutrient value
Ground corn	38	DE, Mcal/kg	3.42
Expanded corn	20	CP, %	18.70
Soybean meal	8	EE, %	3.75
Fermented soybean meal	10	Ca, %	0.91
Extruded soybean	7	P, %	0.68
Fishmeal	3	Av. P, %	0.50
Whey powder	6	Lys, %	1.29
Glucose	2	Thr, %	0.82
Soybean oil	2	Met, %	0.38
Calcium citrate	1
Dicalcium phosphate	1
Premix1	2
Total	100

^a Provided per kilogram of diet: vitamin A, 14,000 IU; vitamin D 2,800 IU; vitamin E, 100 IU; vitamin K, 4 mg; vitamin B₁, 4 mg; vitamin B₂, 10 mg, vitamin B₆, 6 mg, vitamin B₁₂, 60 μg, biotin, 300 μg, folic acid, 15 mg, pantothenic acid, 40 mg; 0.6 mg I as Ca (IO₃)₂; 150 mg Fe as FeSO₄; 40 mg Mn as MnSO₄; 800 mg Zn as ZnO; 0.4 mg Se as Na₂SeO₃; and 1,200 FTU/kg phytase. Different sources of copper replaced the cornstarch in premix to create different dietary treatments containing 0, 5, 10, 20, 40, 80, 160 and 200 mg/kg Cu