In this experiment the Zn, Fe and Cu distribution from layer diet to eggs, liver and excreta together with to manured soil and herbage samples from it were evaluated. Higher doses of Zn do not result in enrichment of products with Zn, but they are eliminated into the soil so there is a danger of Zn accumulation in this. The restriction of Cu to 35 mg.kg-1 allows only a moderate inrease of its concentration in egg and herbage. Fe is unharmful from an environmental aspect, but its implication is significant in interactions with Cu and Zn. High concentrations of the trace elements in excreta indicate limited deposition in tissues and eggs.