Table 2. Calculated and analyzed nutrient content and ingredient profiles of the 4 basal diets for the starter phase (as-fed basis, %)

Ingredient	Diet¹⁾
Ingredient	Control	NC-1	NC-2	NC-3
Corn	57.46	56.59	55.71	54.84
Wheat	4.00	5.33	6.67	8.00
Soybean meal (48 %)	30.25	29.89	29.54	29.18
Fish meal	1.90	1.97	2.03	2.10
Vegetable oil	2.35	2.10	1.85	1.60
Limestone	1.08	1.17	1.27	1.36
Mono-calcium phosphate	1.52	1.51	1.51	1.50
Salt	0.30	0.30	0.30	0.30
Vit-Min premix²⁾	0.30	0.30	0.30	0.30
Lys-HCl	0.25	0.25	0.25	0.25
DL-Methionine	0.29	0.28	0.28	0.27
Cr₂O₃	0.30	0.30	0.30	0.30
Calculated composition
Metabolizable energy (kcal/kg)	3,050	3,010	2,970	2,930
Crude protein (%)	21.50	21.50	21.50	21.50
Lysine (%)	1.32	1.32	1.32	1.32
Methionine + Cystine (%)	1.00	1.00	0.99	0.99
Analyzed xylanase activity	None	NCX-1³⁾	NCX-2	NCX-3
Xylanase activity (U/g)	-	1.49	3.00	4.52

NC-1, −40 kcal/kg ME reduced from PC diet; NC-2, −80 kcal/kg ME reduced from PC diet; NC-3, −120 kcal/kg ME reduced from PC diet; PC, energy sufficient diet.
Vitamin and mineral mixture provided the following nutrients per kg of diet: vitamin A, 24,000 IU; vitamin D3, 6,000 IU; vitamin E, 30 IU; vitamin K, 4 mg; thiamin, 4 mg; riboflavin, 12 mg; pyridoxine, 4 mg; folacine, 2 mg; biotin, 0.03 mg; vitamin B8 0.06 mg; niacin, 90 mg; pantothenic acid, 30 mg; Fe, 80 mg (as FeSO₄ · H₂O); Zn, 80 mg (as ZnSO₄ · H₂O); Mn, 80 mg (as MnSO₄ · H₂O); Co, 0.5 mg (as CoSO₄ · H₂O); Cu, 10 mg (as CuSO₄ · H₂O); Se, 0.2 mg (as Na₂SeO₃); I, 0.9 mg (as Ca (IO₃) · 2H₂O).
NCX-1, NC-3 diet with 1,500 U/kg xylanase; NCX-2, NC-3 diet with 3,000 U/kg xylanase; NCX-3, NC-3 diet with 4,500 U/kg xylanase.
NC, negative control; ME, metabolizable energy; PC, positive control.