Table 1.

Composition of experimental diets¹⁾ (%, as-fed basis)

Item	Corn basal diet
Feedstuff (%)
Corn, yellow	94.77
L-Lys HCl	0.50
DL-Met	0.05
L-Thr	0.15
L-Trp	0.07
Salt	0.40
Monocalcium phosphorus	2.50
Limestone	1.20
Vitamin and mineral premix2)	0.36
Total	100.00
Calculated composition3)
DM (%)	88.9
ME (Mcal/kg)	3.3
CP (%)	8.49
SID Lys (%)	0.57
Ca (%)	0.86
STTD P (%)	0.56
Mannan (%)	0.28

DM, dry matter; ME, metabolizable energy; CP, crude protein; SID, standardized ileal digestible; STTD, standardized total tract digestible.

¹⁾Five feedstuffs including barley, corn distillers dried grains with solubles (DDGS), sorghum, soybean meal, or wheat and two feedstuffs including copra meal or palm kernel meal were replaced into the corn-basal diets at 50% and 30%, respectively, to formulate test diets with or without β-mannanase supplementation at 800 U/kg. The analyzed β-mannanase activities were 835±34 U/kg, 842±25 U/kg, 883±102 U/kg, 937±26 U/kg, 886±98 U/kg, 817±8 U/kg, 821±2 U/kg, and 906±72 U/kg in diets with barley, corn, corn DDGS, copra meal, palm kernel meal, sorghum, soybean meal and wheat, respectively.

²⁾The vitamin premix will supply the following per kg of complete diet: 8,433 IU of vitamin A, 1,202 IU of vitamin D₃ as activated animal sterol, 48 IU of vitamin E, 4.0 mg of vitamin K as menadione dimethylpyrimidinol bisulfate, 6.0 mg of riboflavin, 36.2 mg of niacin, 24.1 mg of d-pantothenic acid as calcium pantothenate, 1.8 mg of folic acid, 0.24 mg of d-biotin, 0.031 mg of vitamin B₁₂. The trace mineral premix will supply the following per kg of complete diet: 16.5 mg of Cu as CuSO₄, 0.3 mg I as ethylenediamine dihydroiodide, 165 mg of Fe as FeSO₄, 40 mg of Mn as MnSO₄, 0.3 mg of Se as Na₂SeO₃, and 165 mg of Zn as ZnO.

³⁾Data based on Kiarie et al. [10] and NRC [23].