Table 5.

Means of skin thickness (ST) and skin strength (SS) of skin samples collected from broilers at 21 and 44 d old and were fed diets with different SID Arg:Lys ratios and control diets in trials 1 and 2.

Traits	SID Arg: Lys ratio (%)							P value			SEM
	94	100	106	112	118	124	Control	ANOVA	Lin	Quad
	Trial 1–21 d
ST1 (mm)	0.489*	0.537*	0.622	0.688*	0.815*	0.955*	0.596	<0.001	<0.001	0.002	0.019
SS (mm)	8.269	9.111	10.478	9.820	9.088	7.928	9.320	0.108	-	-	0.264
	Trial 2–44 d
ST2 (mm)	0.669*	0.861*	0.898	1.063	1.124*	1.211*	0.990	<0.001	<0.001	0.159	0.024
SS3 (mm)	4.545*	4.036*	5.154*	7.053*	7.888	10.171	9.963	<0.001	<0.001	0.059	0.391

^⁎Means followed by an asterisk on the same line differ from the control group by Dunnett's test (P ≤ 0.05).

¹Y = −0.9921810 + 0.0153786X; R² = 0.97.

²Y = −0.9313000 + 0.0174500X; R² = 0.97.

³Y = −15.111120 + 0.1980300X; R² = 0.90.

Y is the response variable, and X is the SID Arg:Lys ratio.

SEM = Standard Error of the Mean.