Table 1. Ingredient and nutrient composition of experimental diets.

Item	Experiment 1	Experiment 2	Experiment 3
Ingredient, %
Corn 7.8% CP	57.31	67.97	75.54
Soybean meal 45% CP	30.34	21.54	14.32
Corn gluten meal	5.00	5.50	5.80
Soybean oil	2.49	0.94	0.80
Dicalcium phosphate	1.39	0.94	0.52
Limestone	1.34	1.06	0.91
Salt	0.29	0.14	0.05
Sodium bicarbonate	0.32	0.39	0.57
DL-Met 99%	0.32	0.26	0.27
L-Thr 98.5%	0.14	0.14	0.09
L-Arg 98%	0.12	0.14	0.20
L-Ile 98.5%	0.08	0.08	0.06
L-Val 96.5%	0.13	0.11	0.07
L-Trp 98%	-	0.01	0.01
L-Leu 98.5%	-	0.03	-
Vitamin and mineral mix1	0.15	0.15	0.15
Choline chloride 60%	0.08	0.10	0.14
Kaolin	0.50	0.50	0.50
Nutritional composition, % or as noted2
AMEn, kcal/kg	3,035	3,108	3,180
Crude protein	22.82 (22.45)	19.48 (19.90)	18.85 (19.00)
Ca, %	1.05	0.84	0.68
Available P, %	0.52	0.42	0.33
Na, %	0.24	0.19	0.20
DEB3, mEq/kg	220	190	180
Choline, mg/kg	1,600	1,550	1,500
dig. TSAA	0.97 (1.02)	0.83 (0.87)	0.80 (0.81)
dig. Lys	0.97 (1.12)	0.77 (0.85)	0.68 (0.77)
dig. Thr	0.84 (0.97)	0.73 (0.81)	0.72 (0.79)
dig. Val	1.05 (1.17)	0.89 (0.98)	0.87 (1.03)
dig. Ile	0.92 (1.03)	0.78 (0.82)	0.74 (0.75)
dig. Leu	1.97 (2.20)	1.79 (1.91)	1.77 (1.89)
dig. Arg	1.38 (1.52)	1.16 (1.25)	1.12 (1.24)

¹ Composition per kg of feed: vit. A, 8,000 UI; vit. D3, 2,000 UI; vit. E, 30 UI; vit. K3, 2 mg; thiamine, 2 mg; riboflavin, 6 mg; pyridoxine, 2.5 mg; cyanocobalamine, 0.012 mg, panthothenic acid, 15 mg; niacin, 35 mg; folic acid, 1 mg; biotin; iron, 40 mg; zinc, 80 mg; manganese, 80 mg; copper, 10 mg; iodine, 0.7 mg; selenium, 0.3 mg; phytase, 100 mg; monensin sodium, 100 mg.

² Values in parenthesis are analyzed and AA digestibility followed Rostagno et al. (2011) [21].

³ Dietary electrolyte balance represents dietary Na + K–Cl in mEq/kg of diet.