Table 1. Composition and nutrient content of experimental diets for steer (DM basis)

Item	Concentration
	Basal diet	Dietary supplementation of rumen-protected TRP
Chemical composition(%)
Moisture	42.7
Crude protein	18.5
Ether extract	5.3
Crude fiber	15.1
Neutral detergent fiber	30.4
Acid detergent fiber	18.1
Ca	1.2
P	0.6
ME (Mcal/kg)	2.7
NEm (Mcal/kg)	1.8
NEg (Mcal/kg)	1.2
Amino acids (total intake g/day [DM basis])
Alanine	63.7
Arginine	31.8
Aspartic acid	57.6
Cystine	21.5
Glutamic acid	128.2
Glycine	36.1
Histidine	18.1
Isoleucine	25.8
Leucine	77.4
Lysine	31.8
Methionine	11.2
Phenylalanine	34.4
Proline	68.0
Serine	34.4
Threonine	31.0
Tryptophan1)	6.0	18.2
Tyrosine	16.3
Valine	37.9

Supplementation of 15 g rumen-protected TRP (as-fed basis). The institute of CJ CheilJedang supplied rumen-protected TRP, TRP were included 0.829 g per 1 g of rumen-protected TRP.
DM, dry matter; TRP, L-tryptophan.