Table 1.

Ingredient composition of the 4 extreme diets with highest and lowest CP level at 2 standardized ileal digestible (SID) levels¹

	Low Lys, low CP	Low Lys, high CP	High Lys, low CP	High Lys, high CP
SID Lys, g/kg	10	10	11	11
CP, g/kg	140	190	140	190
Wheat	25.0	17.6	21.4	12.6
Barley	25.0	15.0	25.0	19.7
Corn	25.0	25.0	25.0	26.0
Soybean meal	5.4	18.2	4.6	20.0
Wheat middlings			4.9
Rapeseed meal	2.6	5.0		5.0
Wheat gluten feed		1.8		0.5
Palm kernel meal		1.7
Premix2	6.0	6.0	6.0	6.0
Beet molasses	3.0	3.0	4.0	3.0
Soy oil	1.9	3.1	2.0	3.0
Silicon oxide	1.0	1.0	1.0	1.0
Salt		0.28		0.28
L-Lysine HCL, 78%	0.83	0.40	1.01	0.49
Limestone	0.80	0.73	0.83	0.73
Monocalcium phosphate	0.63	0.50	0.63	0.49
Bicarbonate	0.56		0.58
l-Threonine, 98%	0.39	0.22	0.49	0.30
l-Valine, 96.5%	0.38	0.17	0.48	0.26
l-Leucine,99%	0.38		0.54	0.13
dl-Methionine, 99%	0.30	0.12	0.39	0.21
l-Isoleucine, 99%	0.28	0.01	0.38	0.08
l-Phenylalanine, 99%	0.21		0.30	0.04
l-Tryptophan, 98%	0.15	0.09	0.18	0.12
l-Tyrosine, 99%	0.13		0.19	0.03
l-Histidine, 99%	0.11		0.16	0.03
Phytase3	0.01	0.01	0.01	0.01

¹The other experimental diets were produced by mixing the high and low CP diets (per SID Lys level) in the required amounts to reach CP levels of 150, 160, 170, and 180 g/kg (150 = 0.8 × 140 + 0.2 × 190; 160 = 0.6 × 140 + 0.4 × 190; 170 = 0.4 × 140 + 0.6 × 190; 180 = 0.8 × 140 + 0.2 × 190).

²The premix contained 80% dairy products and 20% vitamin and mineral premix, providing the following quantities of vitamins and minerals per kilogram of diet: vitamin A, 15,000 IU; vitamin D3, 2,000 IU; vitamin E, 100 mg; vitamin K, 2 mg; vitamin B1, 2.5 mg; vitamin B2, 7.5 mg; vitamin B5, 20 mg; vitamin B6, 5 mg; vitamin B12, 0.04 mg; vitamin C, 100 mg; vitamin PP, 30 mg; choline, 324 mg; folic acid, 3 mg; biotin, 0.15 mg; Ca, 516 mg; P, 419 mg; Mg, 165 mg; Na, 353 mg; Cl, 1,375 mg; K, 1,227 mg; S, 234 mg; Fe, 100 mg; Cu, 160 mg; Mn, 60 mg; Zn, 100 mg; I, 2 mg; Se, 0.4 mg.

³Ronozyme Hiphos. The concentration added provided 1,000 FYT units/kg.