Table 1.

Diet composition (experiment 1 and 2; as-fed basis)

	Phase 11		Phase 22		Phase 33
Item added fat:	0%	6%	0%	6%	0%	6%
Ingredient, %
Corn	68.70	58.64	75.82	66.26	75.28	65.75
Soybean meal, 46.5% CP	28.92	32.91	22.02	25.49	22.73	26.18
Choice white grease	—	6.00	—	6.00	—	6.00
l-lysine HCl	0.15	0.15	0.15	0.15	0.15	0.15
Monocalcium P, 21% P	0.73	0.85	0.60	0.75	0.50	0.58
Ground limestone	0.85	0.80	0.80	0.80	0.80	0.80
Salt	0.35	0.35	0.35	0.35	0.35	0.35
Vitamin premix4	0.15	0.15	0.13	0.10	0.08	0.08
Trace mineral premix5	0.15	0.15	0.13	0.10	0.08	0.08
Ractopamine HCl	—	—	—	—	0.03	0.03
Total	100.00	100.00	100.00	100.00	100.00	100.00
Calculated nutrient composition
Standardized ileal digestible lysine, %	1.01	1.09	0.84	0.91	0.86	0.93
Metabolizable energy (ME), Mcal/kg	3.29	3.57	3.31	3.58	3.31	3.59
Lysine:ME, g/Mcal	3.06	3.06	2.55	2.55	2.59	2.59
Crude protein, %	19.60	20.68	16.90	17.77	17.19	18.05
Calcium, %	0.61	0.63	0.55	0.57	0.51	0.54
Phosphorous, %	0.54	0.57	0.48	0.51	0.46	0.48

¹Phase 1 diets fed day 0 to 42 in experiment 1 and day 0 to 49 in experiment 2.

²Phase 2 diets fed day 42 to 88 in experiment 1 and day 49 to 81 in experiment 2.

³Phase 3 diets fed 88 to 109 in experiment 1 and day 81 to 95 in experiment 2.

⁴Vitamin premix provided per kg of complete feed: 27,558 IU vitamin A, from vitamin A 650; 4,133.6 IU vitamin D3 from vitamin D3 400; 110.2 IU vitamin E from vitamin E 50%; 11.0 mg vitamin K from MPB 100%; 0.10 mg B12 from vitamin B12 600; 24.8 mg riboflavin from riboflavin 95%; 82.7 mg pantothenic acid from d-Cal Pan 100% and 137.8 mg of niacin from niacin 99.5%.

⁵Trace mineral premix provided per kg of complete feed:165.3 g Zn from ZnO; 165.3 g Fe from FeSO₄; 39.7 g Mn from MnO; 16.5 g Cu from CuSO₄; 0.30 mg I from CaI₂O₆; and 0.30 mg Se from NaSeO₄.