Table 1. Composition of experimental diets during lactation (as-fed basis)

	Basal diet
Ingredient (%)
Corn	65.54
Soybean meal (45%)	31.81
Limestone	0.85
Mono-dicalcium phosphate	1.40
Vitamin premix1)	0.20
Mineral premix2)	0.20
Total	100
Calculated chemical composition
Metabolizable energy (Mcal/kg)	3.43
Crude protein (%)	19.76
Crude fat (%)	2.86
Crude fiber (%)	3.33
Neutral detergent fiber (%)	10.78
Acid detergent fiber (%)	4.63
Calcium (%)	0.75
Phosphorus (%)	0.65
Lysine (%)	1.02
Methionine (%)	0.30
Threonine (%)	0.74
Tryptophan (%)	0.22

The vitamin premix provided the following quantities of vitamins per kilogram of diet: vitamin A, 10,000 IU; vitamin D₃, 2,000 IU; vitamin E, 48 IU; vitamin K₃, 1.5 mg; riboflavin, 6 mg; niacin, 40 mg; D-pantothenic acid, 17 mg; biotin, 0.2 mg; folic acid, 2 mg; choline, 166 mg; vitamin B₆, 2 mg; and vitamin B₁₂, 28 μg.
The mineral premix provided the following quantities of mineral per kilogram of diet: Fe, 90 mg from iron sulfate; Cu, 15 mg from copper sulfate; Ze, 50 mg from zine oxide; Mn, 54 mg from manganese oxide; I, 0.99 mg from potassium iodide; Se, 0.25 mg from sodium selenite.