Goal. To determine the efficiency of using silage from Echinochloa frumentacea in comparison with silage from 4-component mixture of spring legumes and forage crops (oats + pisum sativum + narrow-leaved lupine + spring vetch) for fattening calves in Ukrainian Polissia. Methods. 2 groups of experimental calves were formed: Group I (control) — was fed with leguminous silage; Group II (experimental) — received silage from Echinochloa frumentacea. The live weight of calves was determined by individual weighing before morning feeding; the feed payment by live weight gain was determined by the calculation method (feed costs per unit of production in animals of the control and experimental groups), the slaughter quality was determined by technology adopted at meat processing plants. Results. The use of silage from Echinochloa frumentacea instead of the same amount by weight of 4-component leguminous silage (oats + diaper + lupine + vetch) for fattening calves does not significantly reduce the productivity of animals, at the same time it has a positive effect on their slaughter quality and has no negative effect on chemical quality of meat and liver. Conclusions. Replacement in the diets of multicomponent silage from legumes (oats + pisum sativum + narrow-leaved lupine + spring vetch) to silage from Echinochloa frumentacea (45.4% of the nutritional value of the diet) for fattening calves has a negative effect on the average daily gain of live weight of animals (84 g, or 9.8% less than in the control). Metabolic energy consumption per 1 kg of live weight gain was lower by 7.6% in animals of group I compared to analogues of group II.