The research was carried out on Cobb-500 chickens. The amount of stock was 18 000 chickens, which were control group, from this group the experimental group was separated in mount of 100 birds. Control group was fed with balanced full – fed mixtures and watered with clear drinking water. The second, experimental group was supplemented with copper (30 mg Cu·l^–1 H₂0) in drinking water from chelat Cu-lysine. In the 6th week of chicken life, the blood samples were collected from both groups and biochemical indices (activity of ASPAT, ALAT, LDH, ALP, the level of cholesterol, uric acid, triglicerydes, glucose and total protein), basic hematological and content of mineral components were examinated. After supplementation Cu-Lys significant increase of cholesterol and tryglicerides, in comparison with control, took place. The significant influence of chelat on hematological indices of blood wasn’t noticed. The content of K, Mg increased under influence of Cu ions, however the level of Ca, P in blood decreased. But the differences weren’t significant.

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