Table 1.

Ingredient composition of experimental diets, experiment 1 (as-fed basis)

Phase	1		2		3		4
Treatment1,2	PC	NC	PC	NC	PC	NC	PC	NC
Corn, %	35.75	38.74	44.19	47.35	57.35	60.65	67.20	70.35
Start premix3, %	50.00	50.00	31.25	31.25	13.89	13.89	—	—
Vita Plus piglet micro premix3, %	—	—	—	—	—	—	0.25	0.25
Soybean meal, %	10.60	8.85	20.81	18.90	23.90	21.80	27.90	25.95
Soybean oil, %	1.00	0.00	1.00	0.00	1.00	0.00	1.00	0.00
Monocalcium phosphate, %	0.85	0.85	0.75	0.75	1.25	1.25	1.35	1.35
Limestone, %	0.45	0.45	0.50	0.50	0.45	0.45	0.70	0.70
Aureomycin 50 (granular)4, %	0.40	0.40	0.40	0.40	—	—	—	—
Denagard 105, %	0.18	0.18	0.18	0.18	—	—	—	—
Mecadox6, %	—	—	—	—	1.00	1.00	0.50	0.50
Intellibond C27, %	—	—	—	—	—	—	0.04	0.04
Salt, %	0.25	0.25	0.25	0.25	0.35	0.35	0.35	0.35
l-lysine HCl, %	0.19	0.08	0.30	0.18	0.41	0.31	0.38	0.29
l-threonine, %	0.14	0.08	0.18	0.12	0.20	0.16	0.17	0.12
dl-methionine, %	0.19	0.13	0.20	0.12	0.20	0.14	0.16	0.10

¹The NC was achieved by reducing SID lysine by 10% with proportional lowering of all other essential AA, plus reducing added fat by 1 percentage point. Diet phases 1 through 3 were fed for 1 wk each whereas phase 4 was fed for 2 wk.

²Quantum Blue 5G Phytase (AB Vista Feed Ingredients; Marlborough, Wiltshire, UK) was added at 0.0063% to the PC and to the NC diets to produce the two dietary treatments containing 2,500 FTU/kg of phytase.

³Provided a minimum per kilogram of final diet: Fe, 132 mg; Mn, 54 mg; Cu, 23 mg; I, 0.4 mg; Se, 0.31 mg; Zn, 230 mg; vitamin A, 11.22 kIU; vitamin D, 2 kIU; vitamin E (total) 54 IU; vitamin K, 4 mg; niacin, 82 mg; riboflavin, 12 mg; pantothenic acid, 40 mg; vitamin B₁₂, 56 µg; pyridoxine, 5 mg; biotin, 0.27 mg; folic acid, 1 mg; choline, 1,220 mg.

⁴Zoetis, Inc., Florham Park, NJ; chlortetracycline 440.9 mg/kg in the diet.

⁵Elanco Animal Health, Greenfield, IN; tiamulin hydrogen fumarate 180.8 mg/kg in the diet.

⁶Phibro Animal Health Corporation, Teaneck, NJ; carbadox 220.5 mg/kg in the diet.

⁷Micronutrients, Indianapolis, IN; copper chloride.