Effect of selected candidate loci on meat quality indicators by cattle

This study was aimed on analysis of polymorphism at position 2141 in exon 5 of the growth hormone gene (GH) and polymorphism at position 257 in exon 10 of the growth hormone receptor gene (GHR) and to determine the influence of these polymorphisms on meat tenderness. To analysis has been used 333 meat samples of Czech Pied bulls. Genotypization of GH and GHR loci was performed by PCR-RFLP. For detection of single nucleotide polymorphism in both genes was used restriction endonuclease AluI. To determine meat tenderness was used the method of measuring shear force by Warner and Bratzler. The shear force values of raw meat samples were measured at day 14 post mortem. Then was statistically evaluated the association between genotypes and shear force. In the study population occurred for GH locus 166 individuals with genotype LL, 161 heterozygotes LV and 6 homozygotes VV. The relative genotype frequencies were thus 0.499 (LL), 0.483 (LV) and 0.018 (VV). The frequency of L allele was 0,74 and of V allele was 0,26. For GHR locus was found in the study population 178 homozygotes AA, 105 heterozygotes AG and 50 homozygotes GG. The relative frequencies of genotypes were 0.535 (AA), 0.315 (AG) and 0.15 (GG). The frequency of A allele was 0,692 and of G allele was 0,308. Using statistical analysis revealed a significant effect of genotype GH gene on shear force, tenderness resp. (P0,05)