Table 4.
Analysis of variance showing effects of treatment variables as linear, quadratic terms and interaction effects on response variables of crude protein.

Source	Degree of freedom	Fine fraction		Coarse fraction
		F value	Pr>F	F value	Pr>F
Model	9	2.58	0.044	9.37	<0.001
Liner	3	3.37	0.043	24.92	<0.001
Quadratic	3	4.25	0.021	0.61	0.617
Cross	3	0.11	0.955	2.56	0.089
R2		0.577		0.832
X1	4	0.01	0.913	4.51	0.049
X2	4	4.09	0.059	70.01	<0.001
X3	4	6.02	0.025	0.25	0.626

Mill speed (rpm), Separator reverse wheel speed (rpm), Air classifier reverse wheel speed (rpm).