Table 1.

Ingredient composition of experimental diets (as-fed basis).

Item	Xylanase, LXUa/kg
	0	700	1400
Ingredients, %
Yellow corn, ground	61.12	61.11	61.10
Soybean meal	35.30	35.30	35.30
Limestone	1.10	1.10	1.10
Monocalcium phosphorus	1.00	1.00	1.00
Salt	0.30	0.30	0.30
Trace mineral premixb	0.15	0.15	0.15
Vitamin premixc	0.03	0.03	0.03
Xylanase	0.00	0.01	0.02
Calculated composition
ME, MJ/kg	14.02	14.02	14.02
SIDd Lys, %	1.01	1.01	1.01
SID Met + Cys, %	0.59	0.59	0.59
SID Thr, %	0.63	0.63	0.63
SID Trp, %	0.21	0.21	0.21
Ca, %	0.89	0.89	0.89
P total, %	0.61	0.61	0.61
P available, %	0.33	0.33	0.33
Analyzed composition
DM, %	91.77	91.83	91.66
GE, MJ/kg	16.86	16.89	16.67
CP, %	20.36	20.73	21.01
Fat, %	2.55	2.91	2.39
Ca, %	0.76	0.71	0.78
P, %	0.56	0.58	0.56
Ash, %	4.64	4.82	4.81
Xylanase, LXU/kg	<200	674	1231

GE = gross energy; CP = crude protein; Ca = calcium; P = phosphorus.

^aLXU is the amount of enzyme which releases 1 μmol of reducing sugars equivalents (as xylose or glucose) from birch xylan or barley glucan per minute at pH 5.5 and 50 °C.

^bTrace mineral premix supplied per kg of feed: 16.5 mg/kg of Cu as copper sulfate, 165.3 mg/kg of Fe as ferrous sulfate, 39.60 mg/kg of Mn as manganous oxide, 165.30 mg/kg of Zn as zinc sulfate, 0.30 mg/kg of I as ethylenediamine dihydroiodine and 0.30 mg/kg of Se as sodium selenite.

^cVitamin premix supplied per kg of feed: 6171 IU of vitamin A as vitamin A acetate, 880 IU of vitamin D as cholecalciferol, 35 IU of vitamin E as tocopheryl acetate, 0.02 mg/kg of vitamin B₁₂ as cyanocobalamin, 0.18 mg/kg of biotin, 2.91 mg/kg of vitamin K as menadione sodium bidulfite, 4.40 mg/kg of riboflavin, 17.64 mg/kg of pantothenic acid as calcium pantothenate, 26.45 mg/kg of niacin as nicotidamide, 1.32 mg/kg of folate as folic acid.

^dStandardized ileal digestibility.