Beef meat and products are a rich source of protein with a high digestibility coeff icient and an amino acids composition that in 95% matches the reference protein – it is a particularly valuable source of methionine and cystine. These products supply additionally fat of various composition of fatty acids, catabolism of which provides energy and influences decrease of energy from oxidation of proteins. Brown rice constitutes a necessary additive providing the needed amount of carbohydrates necessary for regulating metabolic processes connected with catabolism of protein and fatty acids. Additionally, brown rice as a source of fibres improves digestive functions in the gastrointestinal tract.