RESUMO
This study was performed in order to investigate a relationship between polymorphism's of calapastatin gene (CAST) identified with HinfI, MspI and RsaI restriction endonucleases in pigs and meat quality characteristics and also interactions between CAST and RYR1 genes. Investigations were carried out on group of 89 fatteners being crosses of (Polish Large White×Polish Landrace)×(Hampshire×Pietrain). Some meat quality characteristics, glycolytic potential of LL muscle, yield of curing meat in cooking, the yield of loin in curing and smoking processes were determined. Statistically significant influence of RYR1 genotype (CC and CT) on investigated traits wasn't affirmed. A significant effect of CAST genotype on the value of several meat quality traits was noticed. Interactions between RYR1 and CAST genes were statistically significant for pH(45) value (CAST/RsaI×RYR1) and for drip loss (CAST/HinfI×RYR1). Obtained results showed that glycogen level in LL muscle in 45 min post mortem depends on CAST/MspI and CAST/RsaI genotypes while glycolytic potential depends on CAST/RsaI genotype. Genotyp AA at CAST/RsaI locus and AA genotype at CAST/HinfI locus stopped disclose of effect of RYR1 gene mutation for pH(45) in LD muscle and for drip loss respectively. Animals heterozygous in RYR1 locus (CT) being BB homozygotes at CAST/RsaI locus produced meat with highest pH(45) value (6,4) and dark meat colour. For technological properties of meat most interesting are double heterozygotes at the loci RYR1 and CAST/HinfI with significantly lowest (P⩽0.01) drip loss (4,04%).