Evaluation of Protein Concentration and Limiting Amino Acids Including Lysine and Met + Cys in Prestarter Diet on Performance of Broilers

Table 1

The composition and calculated chemical analysis of diets in Experiment 1-1.

Ingredients (g/Kg)	Treatments
	T1	T2	T3	T4	T5	T6	T7	T8
Corn	520	522	524	531	565	567	568	571
Soybean meal (44%)	376	375	374	368	338	337	336	335
Soy oil	35	34	33	32	28	27	27	25
Monocalcium phosphate	14	14	14	14	14	14	14	14
Limestone	16	16	16	16	16	16	16	16
Premix vit + min.^1, 2	30	30	30	30	30	30	30	30
Salt	4	4	4	4	4	4	4	4
Calculated nutrients values
Metabolizable energy (Kcal/Kg)	3000	3000	3000	3000	3000	3000	3000	3000
Crude protein (%)	23.2	23.2	23.2	23.2	21	21	21	21
Calcium (%)	1	1	1	1	1	1	1	1
Available phosphorus (%)	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Na (%)	0.18	0.18	0.18	0.18	0.18	0.18	0.18	0.18
Arginine	1.39	1.39	1.39	1.38	1.30	1.29	1.29	1.29
Lysine (%)	1.5	1.4	1.3	1.2	1.5	1.4	1.3	1.2
Methionine + cystine (%)	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0

¹Each kg of premix provided vitamin A, 10000 IU; vitamin D3, 2500 IU; vitamin K, 2.4 mg; vitamin E, 44 IU; biotin, 0.1 mg; folic acid, 2.0 mg; niacin, 25 mg; calcium pantothenate, 14.32 mg; pyridoxine, 3.10 mg; riboflavin, 5 mg; thiamin, 1.2 mg; vitamin B12, 10.5 𝜇g; Fe, 85 mg; Mn, 125 mg; Cu, 7.8 mg; Se, 0.09 mg; Zn, 60 mg; choline chloride, 5.5 mg.
²Lysine and methionine were added inside of premix.