Scientists at the Russian State Agrarian University are developing new feed additives based on bee products, including propolis, to boost animal immune systems. These additives are seen as an alternative to antibiotics, which have adverse effects on young livestock and birds. The bee products have been shown to activate the immunocellular, hormonal, and biochemical status of the body, and are preferred by livestock and poultry complexes, agricultural holdings, and peasant farms due to their synergistic effect and the fact that microorganisms do not build resistance to them, as with antibiotics.