The purpose of the present study was to define the effect of the Cu-lysine chelate, added to the turkey diets on the results of slaughter analysis, the chemical composition and the fatty acids profile of their breast muscles and the liver.The experiment was carried out on 2 groups of heavy type (BIG-6) turkey males (100 birds each) during 16-week rearing.All the birds were fed ad libitum standard complete mixtures and had unlimited access to water. The turkeys of experimental group received in water a supplement of Cu (10 mg Cu×dm^–3H₂O) in the form of chelate with lysine.The results showed that the mineral-organic complex of Cu used in the experiment, resulted in an increase (by 6.4%, P ≤ 0.05) of the turkey body weight, but it did not have a significant effect on the results of the slaughter analysis of turkeys. The addition of Cu chelate with lysine decreased (by 11.83%, P ≤ 0.05) total protein content in the liver, but it did not influence on the chemical composition of breast muscles. In the livers of the birds supplemented with Cu an increase in the content of miristic and linoleic acids. In the breast muscles a decrease by saturated acids (miristic, palmitic and behenic) content and increase of oleic acid was observed. The changes effected a decrease in the total content of saturated fatty acids (by 12.33%) in the fat of breast muscles of the turkeys receiving a supplement of chelate Cu with lysine.

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