THE EFFECT OF COPPER AND ZINC CONCENTRATIONS IN FEED AND WATER ON THEIR DISTRIBUTION IN BEEF CATTLE TISSUES**

**Original scientific paper Abstract: An investigation of the effect of copper (Cu) and zinc (Zn) concentrations on their distribution in beef cattle tissues was conducted using feed trial with the following four nutrition treatments applied. At the end of the trial, samples of the muscular tissue, liver and kidneys of slaughtered cattle were taken from 10 head of cattle of the I group, 30 head of the II and III groups and 15 head of the IV group. The analyses were made by using the spectroscopic AAS method. Investigation results showed that all groups of cattle were given water with Cu and Zn contents below maximum permissible concentrations (MPC). The content of Cu and Zn in the tissues of the beef cattle in our experiment directly depended on their content in the concentrated feed. Copper is deposited in the liver the most, and Zn in the muscular tissue (excepting the II group of cattle). Correlation dependence of Cu and Zn content in the tissues from content in DM is complete (total), except in the case of Zn content in kidney, where is above mentioned correlation very strong (0.795)