Effects of supplemental zinc source and level on antioxidant ability and fat metabolism-related enzymes of broilers1

The objective of the present study was to investigate the effects of dietary supplemental Zinc (Zn) source and level on antioxidant ability and fat metabolism-related enzymes of broilers. Dietary treatments included the Zn-unsupplemented corn-soybean meal basal diet (control) and basal diets supplemented with 60, 120, or 180 mg Zn/kg as Zn sulfate, Zn amino acid chelate with a weak chelation strength of 6.5 quotient of formation (Q f ) (11.93% Zn) (Zn-AA W), Zn proteinate with a moderate chelation strength of 30.7 Q f (13.27% Zn) (Zn-Pro M), or Zn proteinate with an extremely strong chelation strength of 944.0 Q f (18.61% Zn) (Zn-Pro S). The results showed that dietary supplemental Zn increased ( P