Table 3. Developed prediction equations for the gross energy concentrations (kcal/kg, DM basis) of feed ingredients based on chemical composition

	Equations	R2	RMSE	MBE
1)	4,310.5 + 54.1 × EE (%) + 10.2 × CP (%) − 14.3 × ash (%)	0.379	218.93	−104.83
2)	4,296.8 + 49.8 × EE (%) + 10.3 × CP (%) + 5.3 × CF (%) − 19.0 × ash (%)	0.385	217.87	−93.80
3)	5,017.2 + 51.3 × EE (%) + 10.5 × CP (%) + 7.0 × CF (%) − 18.0 × ash (%) − 8.45 × DM (%)	0.388	217.36	−94.77