The purpose of this experiment was to determine the influence of Cu chelated with lysine in drinking water on physical parameters and mineral composition of tibia in turkeys. The research was carried out on 2 groups of heavy type turkeys BIG-6 (100 birds each). All the birds were kept under regular environmental conditions, according to the accepted norms of industrial fattening. Turkeys were fed standard complete mixtures and had unlimited access to water. The turkeys of experimental group received the supplement of Cu chelated with lysine in drinking water at the concentration of 10mg Cu∙dm^-3 H₂O. The research showed that the final body weight of experimental turkeys was higher compared to the control birds. The difference was confirmed statistically at p≤0.05. The addition of Cu-bioplex decreased the fresh bone weight by 14.1% and the air dry matter of bone by 8%. The share of tibia bones in the experimental turkeys body weight was decreased by 20.5% compared to the control group. The durability of tibia bones in turkeys given chelate was lower by 6.7% than the value describing the control group. The supplement of Cu-biplex had no significant effect on the content of tibia crude ash but it decreased both Ca and P concentrations and increased the content of Mg whereas the content of Cu was the same in every group.

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