Four transgenic pigs, produced with the use of two different gene constructs containing the bovine growth hormone coding gene - Mt-bGH-10D6 (wild type) and Mt-bGH-M8 (mutated), were used to produce the F1 generation to investigate their performance traits. No differences were observed in fattening and slaughter traits between transgenic and non-transgenic pigs. It was found that the weight of ham proper and loin eye area was significantly higher in carriers of Mt-bGH-10D6 gene constructs.