„The possibilities of intensive fattening based on complete feed mixture, so-called fattening baby beef, which uses high growth potential bull-calves of dairy breeds by the age of one year were analysed. Holstein steers achieved on average 278.41 kg live weight at the end of fattening (245 days of life), with average daily intake of mixture 4.49 kg. The average daily gain 1124 g was found out during the fattening. The feed conversion of granulated feed mixture was 3.39 kg. Detailed dissection of 6 pieces was done to obtain the carcass value parameters. According to the EUROP classification of carcass by conformation and fatness 5 carcasses were assigned to the R2 and one U2 class. The cooling loss was 0.76 %. The weight of hot carcass was 154 kg i.e. 51.56 % dressing percentage. The valuable cuts of carcass were 38.88 % and proportion of fat in carcass was 4.7 %. We confirmed that prolongation of fattening increases the fat content in meat (1.567 g.100 g -1) and consequently increases the energy value (448.015 kJ.100 g-1). From observed fatty acids in the intramuscular fat of musculus longissimus thoracis et lumborum had oleic acid (44.93 %) the largest proportion out of monounsaturated fatty acids, followed by saturated fatty acids palmitic acid (24.44 %) and stearic (16.46 %). Linoleic acid (8.3 %) had the highest proportion out of the essential fatty acids. The fattening baby-beef is a suitable alternative for utilization of dairy breed bulls to achieve very good carcass parameters.“