Table 2.

Calculated and analyzed nutrient content of the grower diets (Exp. 1)

Basal diet	Percent digestible lysine requirement
	80%	88%	96%	104%
Ingredient, % of diet (as-fed basis)
Corn	63.44	63.59	63.76	63.91
Soybean meal, 48%	23.52	23.27	22.99	22.74
Cottonseed meal, 36%	5.00	5.00	5.00	5.00
Soybean oil	4.64	4.61	4.56	4.52
Salt	0.39	0.35	0.30	0.27
Limestone	0.85	0.85	0.85	0.85
Dicalcium phosphate1	0.91	0.91	0.91	0.91
Sodium bicarbonate	0.05	0.12	0.18	0.23
Lysine-HCl	0.00	0.11	0.24	0.35
DL-methionine	0.25	0.26	0.26	0.26
Threonine	0.08	0.09	0.09	0.10
Vitamin and mineral premix2	0.50	0.50	0.50	0.50
Inert (corn/phytase)3	0.06	0.06	0.06	0.06
Nutrient composition, % (as-fed basis)
Crude protein	19.00	19.00	19.00	19.00
ME, kcal/kg	320,000	320,000	320,000	320,000
Dry matter	87.52	87.53	87.54	87.54
Calcium	0.72	0.72	0.72	0.72
Total phosphorus	0.55	0.55	0.55	0.55
Available phosphorus	0.25	0.25	0.25	0.25
Total lysine	0.96	1.05	1.14	1.21
Digestible lysine	0.84	0.92	1.01	1.09
Digestible methionine + cysteine	0.79	0.79	0.79	0.79
Digestible threonine	0.69	0.69	0.69	0.69
Sodium	0.18	0.18	0.18	0.18
Chloride	0.28	0.28	0.28	0.28
Analyzed nutrient composition, % (dry matter basis)
Crude protein	21.05	20.83	22.38	21.33
Total lysine	1.08	1.12	1.31	1.36

¹Dicalcium phosphate supplied 18.5% P and 22% Ca.

²Supplied per kilogram of diet: iron (ferrous sulfate), 34 mg; manganese (manganese sulfate), 38 mg; zinc (zinc sulfate), 34 mg; copper (basic copper chloride), 6 mg; iodine (calcium iodate), 0.8 mg; selenium (sodium selenite), 113 µg; vitamin A, 9.4 MIU; vitamin D₃ 2.1 MIU; vitamin E, 22.5 mg; vitamin B₁₂, 11 µg; riboflavin, 3.8 mg; niacin, 25 mg; d-pantothenic acid, 11 mg; vitamin K, 1.5 mg; folic acid, 0.8 mg; vitamin B₆, 1.9 mg; thiamine, 1.5 mg; biotin, 60 µg.

³Corn was added in place of phytase in the diets without phytase supplementation. The phytase used was Quantum Blue (AB Vista, Marlborough, UK) with an expected activity of 5,000 FTU/g.