Table 1.

Ingredient and analyzed nutrient composition of diets used in Exp. 1

	Phase 1 diets		Phase 2 diets
Item	Control	Cu1	Control	Cu1
Ingredient, %
Ground corn	47.95	47.95	49.69	49.69
Soybean meal, 48% CP	26.50	26.50	33.50	33.50
Whey, dried	15.00	15.00	10.00	10.00
Fishmeal	6.00	6.00	3.50	3.50
Soybean oil	2.10	2.10	1.27	1.27
Limestone	1.05	1.05	0.63	0.63
Cornstarch	0.10	0.074	0.10	0.074
Copper hydroxychloride, 58% Cu	—	0.026	—	0.026
L-Lysine HCl, 78%	0.35	0.35	0.37	0.37
DL-Methionine	0.13	0.13	0.13	0.13
L-Threonine	0.10	0.10	0.09	0.09
Sodium chloride	0.50	0.50	0.50	0.50
Vitamin-mineral premix2	0.20	0.20	0.20	0.20
Phytase premix3	0.02	0.02	0.02	0.02
Analyzed values
DM, %	88.34	88.41	88.16	88.34
Ash, %	6.50	6.42	6.08	5.85
GE, kcal/kg	3995	3998	4034	4074
CP, %	22.44	22.71	19.97	22.42
Cu, mg/kg	20	171	14	154
AA, %
Arg	1.35	1.38	1.45	1.48
His	0.51	0.52	0.62	0.62
Ile	0.99	1.01	1.03	1.02
Leu	1.83	1.87	1.89	1.88
Lys	1.64	1.58	1.60	1.61
Met	0.44	0.46	0.45	0.45
Phe	1.03	1.05	1.12	1.12
Thr	0.93	0.97	0.95	0.94
Trp	0.28	0.28	0.27	0.29
Val	1.08	1.10	1.11	1.10

¹Cu from Cu hydroxychloride.

²Provided the following quantities of vitamins and microminerals per kilogram of complete diet: vitamin A as retinyl acetate, 11,136 IU; vitamin D₃ as cholecalciferol, 2,208 IU; vitamin E as DL-α-tocopheryl acetate, 66 IU; vitamin K as menadione dimethylprimidinol bisulfite, 1.42 mg; thiamin as thiamine mononitrate, 0.24 mg; riboflavin, 6.59 mg; pyridoxine as pyridoxine hydrochloride,0.24 mg; vitamin B₁₂, 0.03 mg; d-pantothenic acid as d-calcium pantothenate, 23.5 mg; niacin, 44.1 mg; folic acid, 1.59 mg; biotin, 0.44 mg; Cu, 10 mg as copper sulfate and 10 mg as copper chloride; Fe, 126 mg as ferrous sulfate; I, 1.26 mg as ethylenediamine dihydriodide; Mn, 60.2 mg as manganese sulfate; Se, 0.3 mg as sodium selenite and selenium yeast; and Zn, 125.1 mg as zinc sulfate.

³Provided 400 units of phytase (Optiphos 2000, Huvepharma, Sofia, Bulgaria) per kilogram of complete diet.