Table 8. ANOVA, coefficient estimates and summary statistics of carcass traits (g/bird) in response to digestible lysine concentration (SID Lys), energy density (AMEn) and starch to lipid ratios (S:L) in broiler chickens.

	Carcass weight		Leg quarters		Breasts		Wings
Variables1	Coefficient	P-Value	Coefficient	P-Value	Coefficient	P-Value	Coefficient	P-Value
First order
X1	29.3823	< 2×10−16	-	-	-	-	3.4074	5.19×10−10
X2	-	-	-	-	-	-	-	-
X3	-2.0664	6.3×10−5	-7.4804	0.0995	-10.575	< 2×10−16	-	-
Second order
X1	-	-	-2.6708	0.0010	-	-	-	-
X2	-	-	-2.9177	2.74×10−6	-	-	-	-
X3	-	-	-	-	-	-	-	-
Interactions
X1: X2	-	-	6.092	1.22×10−5	-	-	-	-
X2: X3	-	-	-0.6048	0.0110	-	-	-	-
X1:X3	-	-	1.0467	0.0006	0.9224	6.96×10−16	-	-
Intercept	1069.3	< 2×10−16	493.97	< 2×10−16	485.1	< 2×10−16	96.6441	< 2×10−16
R2	0.2034		0.2103		0.1298		0.0723
R2adj	0.2003		0.2010		0.1264		0.0705
P-value		< 2×10−16		< 2×10−16		3.041*10−16		5.19×10−10

¹X₁: SID Lys (g/kg); X₂: AMEn (MJ/kg); X₃: S:L