Table 1.

Ingredient composition of experimental diets (as-fed basis)

Ingredient	Dietary CP levels (%)
	20	17.5	15
Composition calculated (%)
Corn, yellow	56.65	57.59	58.59
Soybean meal	33.04	26.09	17.09
Corn gluten feed	0.00	5.33	12.32
Molasses	5.00	5.00	5.00
Sugar	3.00	3.00	3.00
Limestone	0.79	0.76	0.71
Dicalcium phosphase	0.54	0.72	0.97
Soybean oil	0.29	0.86	1.66
Salt	0.25	0.25	0.25
Vitamin1 and mineral mixture2	0.35	0.35	0.35
L-lysine·HCl	0.09	0.05	0.06
Composition analyzed (%)
Crude protein	18.75	15.92	13.80
DE (kcal/kg)	3,983	3,977	3,788
Crude fiber	2.35	2.92	2.84
Ca	1.02	0.75	1.02
P	0.49	0.51	0.59
Indispensable amino acids
Arginine	1.13	0.99	0.80
Histidine	0.49	0.43	0.36
Isoleucine	0.72	0.60	0.49
Leucine	1.64	1.45	1.25
Lysine	1.08	0.84	0.65
Methionine	0.22	0.18	0.17
Phenylalanine	0.90	0.76	0.61
Threonine	0.72	0.63	0.51
Valine	0.77	0.67	0.58
Dispensable amino acids
Alanine	0.93	0.84	0.75
Aspartate	1.92	1.62	1.25
Cysteine	0.26	0.23	0.23
Glutamate	3.47	3.17	2.53
Glycine	0.77	0.67	0.55
Proline	1.02	0.95	0.84
Serine	0.92	0.80	0.63
Tyrosine	0.58	0.50	0.44

CP, crude protein; DE, digestible energy.

¹Provided the following amounts per kilogram of diet: vitamin A 5,500 IU; vitamin D₃ 550 IU; vitamin E 27 IU; menadione sodium bisulfate 2.5 mg; pantothenic acid 27 mg; niacin 33 mg; riboflavin 5.5 mg; vitamin B₁₂ 0.04 mg; thiamin 5 mg; pyridoxine 3 mg; biotin 0.24 mg; folic acid 1.5 mg; choline chloride 700 mg.

²Provided the following per kilogram of diet: choline chloride 700 mg; selenium 0.15 mg; manganese 0.03 g; zinc 0.1 g; iron 0.1 g; iodine 0.5 mg; magnesium 0.1 g.