Abstrakt
The aim of this study was to verify the hypothesis postulating that the supplementation
of turkey diets with Cu nanoparticles can lower dietary inclusion levels of Cu without compromising
the growth rate and antioxidant status of turkeys. The experiment was carried out on
648 one-day-old Hybrid Converter turkeys divided into 6 groups with 6 replicates per group,
in a two-factorial design with 3 dietary inclusion levels of Cu (20, 10 and 2 mg/kg) and 2 dietary
sources of Cu - copper sulfate (Cu-SUL) and Cu nanoparticles (Cu-NP). At 42 days of age, blood
samples were collected from 2 birds per replicate (12 birds per group), after slaughter livers were
collected for analyses. Blood and liver samples were assayed for: Cu, Zn, Ca, P, Mg, GLU, TP,
ALB, UREA, TAG, TC, UA, ALT, AST, ALT, GGT, ALP, SOD, GPx, CAT, VIT C, FRAP,
GSH+GSSG, LOOH, MDA.
The results of this experiment demonstrate that a decrease in the dietary inclusion levels
of Cu from 10 mg/kg to 2 mg/kg does not compromise the growth performance of turkeys, but
weakens antioxidant defense mechanisms. A Cu dose of 20 mg/kg induces oxidation reactions
and has a much more inhibitory effect on the antioxidant defense system than dietary Cu content
of 2 mg/kg. In turkeys, dietary supplementation with Cu-NP has a more beneficial effect on
carbohydrate metabolism and antioxidant status compared with Cu-SUL. The results of analyses
examining the antioxidant and metabolic status of young turkeys indicate that 10 mg/kg
is the optimal dietary inclusion level of Cu.
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