Table 1.

Ingredient and nutrient composition (as-fed) of experimental diets fed during metabolism study¹

Item	Treatment2
	LF	HF	HF + XY	HF + AX
Ingredient composition, %
Corn	75.996	45.975	45.965	45.970
Corn bran without solubles	0.000	30.000	30.000	30.000
Soybean meal, 46.5%	20.566	20.566	20.566	20.566
Limestone	1.182	1.159	1.159	1.159
Monocalcium phosphate 21%	0.504	0.593	0.593	0.593
Sodium chloride	0.500	0.500	0.500	0.500
Cr2O3	0.500	0.500	0.500	0.500
L-lysine HCl	0.295	0.267	0.267	0.267
Trace mineral premix3	0.200	0.200	0.200	0.200
Vitamin premix4	0.140	0.140	0.140	0.140
L-threonine	0.067	0.054	0.054	0.054
DL-methionine	0.043	0.041	0.041	0.041
Phytase5	0.005	0.005	0.005	0.005
Xylanase6	0.000	0.000	0.010	0.000
AXOS7	0.000	0.000	0.000	0.005
Calculated nutrients, %
Standard ileal digestible lysine, %	0.92	0.92	0.92	0.92
Standard ileal digestible TSAA8:lysine	0.56	0.56	0.56	0.56
Standard ileal digestible threonine:lysine	0.61	0.61	0.61	0.61
Standard ileal digestible trpytophan:lysine	0.17	0.17	0.17	0.17
Calcium, %	0.63	0.63	0.63	0.63
Standardized total tract digestible phosphorus, %	0.31	0.31	0.31	0.31
Metabolizable energy Mcal/kg	3.26	3.02	3.02	3.02
Net energy, Mcal/kg	2.46	2.26	2.26	2.26
Analyzed composition, %
DM	89.12	89.81	89.98	90.15
Starch	41.08	23.55	23.70	23.11
CP	15.56	15.54	15.47	15.60
NDF	7.54	21.91	22.12	22.08
ADF	2.41	5.53	5.78	5.59
aEE9	2.48	2.74	2.82	2.89
Cr2O3	0.49	0.49	0.49	0.49

¹Adapted from Petry et al. (2020b).

²Treatments include: LF, basal corn-soybean diet; HF, basal corn-soybean diet with 30% corn bran at the expense of corn; HF with the addition of xylanase (HF + XY); HF with the addition of AXOS (HF + AX).

³Mineral premix provided the following (per kg diet): 165 mg of Fe (ferrous sulfate); 165 mg of Zn (zinc sulfate); 39 mg of Mn (manganese sulfate); 16.5 mg of Cu (copper sulfate); 0.3 mg of I (calcium iodate); 0.3 mg of Se (sodium selenite).

⁴Vitamin premix provided the following (per kg diet): 6,125 IU of vitamin A; 700 IU of vitamin D3; 50 IU of vitamin E; 3 mg of menadione (to provide vitamin K); 11 mg of riboflavin; 27 mg of d-pantothenic acid; 0.05mg of vitamin B12; and 56 mg of niacin.

⁵Quantum Blue 5G, AB Vista, Marlborough, UK.

⁶Econase XT 25P, AB Vista, Marlborough, UK; inclusion level provided 16,000 birch xylan units per kg.

⁷XOS 35A; Shandong Longlive Biotechnology, Shandong, China; 3–7 degrees of polymerization.

⁸TSAA, total sulfur amino acids (Met + Cys).

⁹aEE, acid-hydrolyzed ether extract.