. 2020 Jul 3;99(11):6233–6238. doi: 10.1016/j.psj.2020.06.029

Table 4.

Effects of dietary supplementation of different levels and sources of zinc on serum antioxidant factors and zinc concentration in laying hens.

Parameters	CON, 0 mg/kg	AvZn-L, 35 mg/kg	AvZn-H, 70 mg/kg	ZnSO₄-L, 35 mg/kg	ZnSO₄-H, 70 mg/kg	P-values
Parameters	CON, 0 mg/kg	AvZn-L, 35 mg/kg	AvZn-H, 70 mg/kg	ZnSO₄-L, 35 mg/kg	ZnSO₄-H, 70 mg/kg	L	S	L × S
Zn²⁺, μmol/L	21.5 ± 3.44	26.8 ± 3.25	29.1 ± 6.09	23.6 ± 4.82	28.6 ± 6.56	0.007	0.456	0.676
SOD, μ/ml	157 ± 6.71	164 ± 5.95	167 ± 5.68	158 ± 12.12	164 ± 4.59	0.065	0.174	0.540
Cu-ZnSOD, μ/ml	165 ± 35.44	170 ± 22.69	182 ± 24.96	169 ± 24.67	181 ± 20.29	0.009	0.902	0.996

Abbreviations: AvZn, Availa Zn; CON, control group; L, zinc levels; S, zinc sources; S × L, the interaction of zinc sources and levels; ZnSO₄, zinc sulfate.

Total dietary Zn per kg dry matter; CON, 20.56 mg/kg; AvZn-L, 55.56 mg/kg; AvZn-H = 90.56 mg/kg; ZnSO₄-L, 55.56 mg/kg; ZnSO₄-H, 90.56 mg/kg.

Values under treatment denote supplementary dietary zinc.