The aim of this study was to characterize the polymorphism of GH and LEP genes in selected pig breeds reared in Poland and to analyse the relation between the GH and LEP genotypes and carcass meat and fat deposition. The tests covered a total of 305 animals of the following breeds and lines:Pietrain (P), Złotnicka Spotted (ZS), Polish Landrace (PL), Torhyb [P × (PL × Polish Large White)],Stamboek (Dutch Landrace × Dutch Large White) and Pig Improving Company (PIC) pigs.The frequency of particular variants of porcine LEP and GH genes proved to be dependent on breed or line. An association between genotypes at loci LEP and GH and carcass traits was analysed on a material comprising 115 Torhyb, 44 Stamboek and 56 PIC pigs. The genotype at loci LEP and GH affected the value of particular carcass traits, but what traits were affected and what was the level of significance depended on the line. Genotype TT at locus LEP proved more advantageous for decreasing both fat weight and fat content of ham in PIC pigs than genotype CT. Moreover, genotypes AA at locus GH/HaeII and BB at locus GH/MspI were the least advantageous for weight of ham and ham meat when compared to the remaining genotypes at these loci. The same genotypes at the GH locus increased carcass length. It is concluded that a knowledge of LEP and GH genotypes might be useful for improving several traits determining carcass quality in some pig breeds and lines.
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