Beef performance of 60 bulls from the second stage of crossing Polish Black and White cows with Simmental, Jersey and Holstein- Friesian bulls, was evaluated. The bulls were fattened under semi- intensive system of feeding, from 5 to 20 months of age. All that time the animals were housed in tying stalls. The differences in body weight between different genetic groups increased with time. Final body weight varied from 452 to 533 kilogramms ; daily gains, respectively, from 717 to 852 g. Little difference between groups was observed in slaughter value, but the differences in tissue composition, and fat content in particular, were rather high.