Mixts. of maize silage, beet pulp and cattle slurry were fermented under anaerobic conditions to biogas and MeH. The highest efficiency of biogas prodn. was 747.88 m(3)/Mg of dry organic matter. In the case of maize silage and cattle slurry, the biogas yield was much lower and ranged in 488.03-476.80 m(3)/Mg of dry mass. It was achieved when a mixt. of maize silage and cattle slurry (9:91 and 13:87 by mass) was used as raw material.