In an experiment with 3 groups of fatteners, the effect of the Polish naked oat cultivar Akt on the chemical composition of meat and some parameters of slaughter analysis was studied. The naked oat constituted 55% of the feed mixture. Besides it, in one group, a 3% addition of synthetic zeolite, was used. Instead of oat, the control group received the same quantity of barley. It was found that the inclusion of naked oat led to a higher fat percentage in M. longissimus dorsi tissue and thicker backfat layer over the shoulder. In respect to the other parameters, the differences were insignificant. The addition of zeolite decreased the loin eye area (significantly in comparison with oat without the additive) and deteriorated meat tissue consistency as compared with the remaining groups.