Composition of the diets (as-fed basis).

1CC = control corn; PTC = phytase transgenic corn. 2Provided per kilogram of diet: vitamin A, 12,200 IU; vitamin D3, 4,125 IU; vitamin E, 30 IU; vitamin K, 4.5 mg; thiamine, 1 mg; riboflavin, 8.5 mg; calcium pantothenate, 50 mg; niacin, 32.5 mg; pyridoxine, 8 mg; biotin, 2 mg; folic acid, 5 mg; vitamin B12, 5 mg; manganese, 80 mg; iodine, 1 mg; iron, 60 mg; copper, 8 mg; zinc, 80 mg; selenium, 0.3 mg. 3Calculated values. 4Determined values.