The analysis of literary sources testifies to insufficient content of Selenium in forage. Therefore some extra Selenium-containing compounds have to be added to the rabbits’ diet so that the desired rate of Selenium could be reached. The data, received from in-vivo research showed that of all used sources of Selenium (sodium selenite, sodium selenate, selenomethionine and Sel-Plex) the most effective for young rabbits was Sel-Plex. Inclusion of Sel-Plex into diet to reach Selenium level 0,2 mg/kg of dry matter led to the live weight increase of experimental rabbits by 4,7 % with a simultaneous decrease by 2,9 % of ra feed portion per 1 kg of body weight increase. Using Sel-Plex instead of sodium selenite for young rabbits leads to a tendency to increase the absorption of Calcium and Phosphorus into the rabbits body. The use of inorganic   Selenium salts, as compared with organic, has a less positive influence on the productivity of rabbits.

Key words: Selenium, Calcium, Phosphorus, rabbit, productivity, sodium selenite, sodium selenate, selenomethionine, Sel-Plex, live weight, feed.