Table 5. The contents of heavy toxic metals in breast and thigh muscles (mg/kg fresh sample).

Items	Zn as ZnPal1 (mg/kg)					SEM2	P-value
	0 (Control)	20	40	60	80		Control vs ZnPal	Linear	Quadratic
Breast
Pb	0.124a	0.118ab	0.113b	0.112b	0.120ab	0.001	0.015	0.039	0.016
Cr	0.286	0.253	0.254	0.290	0.313	0.010	0.357	0.406	0.070
Thigh Pb
0.120a	0.128a	0.123a	0.083b	0.083b	0.004	<0.001	<0.001	<0.001
Cr	0.281ab	0.300a	0.266ab	0.242bc	0.218c	0.007	<0.001	<0.001	0.003

^a–bMeans within a row with different superscripts are different at P <0.05.

¹ZnPal, zinc bearing palygorskite.

²SEM, total standard error of means.