Aminopower is a concentrated formula of endogenic and exogenic amino acids which constitute a basic building structure of muscles. The acces to the easy assimilable amino acids contained in the formula contributes to the proper growth and development of birds as well as their proper productivity (laying performance, daily rate of weight gain). Due to the free amino acids the quality of eggs production is improved. The addiction of lysine and methionine influences the increase of the mass of the eggs (including white and yolk), whereas the lack of these amino acids results in the mass loss. As a result of being the major building element, amino acids improve daily rate of the body weight gain. Moreover, they are components of the enzymes responsible for proper digestion. Therefore, the wide range of amino acids contributes to the improvement of production results.