Table 1.

Composition and nutrient levels of diets^a

Component	Content (%)b
	14% CP	17% CP	20% CP
Ingredient
Corn	71.80	66.50	63.70
Soybean meal	13.40	18.80	19.80
Whey powder	4.40	4.30	4.30
Fish meal	1.50	4.00	9.00
Soybean oil	4.10	2.60	0.80
Lys	0.88	0.62	0.38
Met	0.27	0.19	0.10
Thr	0.33	0.21	0.09
Trp	0.08	0.04	0.01
Calcium hydrophosphate	1.15	0.74	0.00
Limestone	0.79	0.70	0.52
Salt	0.30	0.30	0.30
1% premix compoundc	1.00	1.00	1.00
Total	100.00	100.00	100.00
Calculated nutrient content
DE (MJ/kg)	14.60	14.60	14.60
CP	14.00	17.00	20.00
Total Ca	0.70	0.71	0.69
Total P	0.53	0.55	0.57
Arg	0.75	0.91	1.09
His	0.34	0.40	0.46
Ile	0.49	0.60	0.70
Leu	1.15	1.32	1.49
Lys	1.23	1.23	1.23
Met+Cys	0.68	0.68	0.68
Phe	0.59	0.69	0.80
Thr	0.73	0.73	0.73
Trp	0.20	0.20	0.20
Val	0.53	0.65	0.77
EAA/NEAA	0.90	0.80	0.70
Recommendation rate of NRC (2012)	0.80	0.80	0.80

^aDiets contain 14%, 17%, and 20% CP, respectively, with appropriate crystalline AA supplementation

^bThe values are expressed as percentage (%), except for digestible energy (DE; MJ/kg), essential AA (EAA)/nonessential AA (NEAA), and recommendation rate of NRC (2012)

^cPremix provided these amounts of vitamins and minerals per kilogram on an as-fed basis: vitamin A, 10 800 IU; vitamin D₃, 4000 IU; vitamin E, 40 IU; vitamin K₃, 4 mg; vitamin B₁, 6 mg; vitamin B₂, 12 mg; vitamin B₆, 6 mg; vitamin B₁₂, 0.05 mg; biotin, 0.2 mg; folic acid, 2 mg; niacin, 50 mg; D-calcium pantothenate, 25 mg; Fe, 100 mg as ferrous sulfate; Cu, 150 mg as copper sulphate; Mn, 40 mg as manganese oxide; Zn, 100 mg as zinc oxide; I, 0.5 mg as potassium iodide; and Se, 0.3 mg as sodium selenite