In an experiment carried out on 48 fatteners, the efficacy of high-lysine maize grain in pig fattening was compared with a normal maize variety. High-lysine maize silage is characterized by a higher content of crude protein (by 6.3%) and lysine (by 47.9%) in dry matter, which made it possible to decrease daily amounts of soyabean meal for experimental pigs. Intake of this component per kg of BWG was lower by approximately 15% during the whole fattening period. Animals in the high-lysine maize group gained slightly better, the quality of their carcasses were similar, while the protein content in M longissimus dorsi was significantly higher (P<0.01).