Table 1. Chemical compositions of concentrates and rice straw used in this study

% of DM	Concentration1)	Rice straw2)
Crude protein	13.0	4.5
Ether extraction	2.5	1.7
Crude fiber	15.0	28.1
Crude ash	15.0	14.7
Calcium	0.9	0.3
Phosphate	1.2	0.1
Total digestible nutrients	69.0	43.7

The chemical compositions of concentration were provided by Nonghyup feed, Inc (Seoul, South Korea).
The chemical compositions of rice straw were obtained from the farming portal of the Rural Development Administration.
DM, dry matter.