Authors : Guillermo Davalos-Aranda, Ruben Maldonado-Mena, Martha V. Garza-Zermeno, Sibilina Cedillo-Rosales, Luis C. Galan-Alejo and Victor M. Riojas-Valdes
Abstract: Due to consumer preferences, pork breeders are focusing to the production of leaner pigs, as well as towards to higher final weight of carcasses. Linkage analysis studies have been conducted in order to analyze associations among genetic variants of genes such as Ryanodyn Receptor (RYR-1 or porcine stress syndrome) and Insulin-like Growth Factor (IGF-2). These associations can be useful for the breeding of swine population with improved fat and weight traits. In the present study, the following production traits were analyzed in 190 F1 (filial generation), obtained from 30 P1 (paternal generation) pigs: number of animals born, weight at birth, number of dead animals at lactation, weaning weight, post weaning weight and final weight. Furthermore, carcass traits as hot-carcass weight, dorsal fat thickness and carcass yield were studied. Genotypic frequencies of RYR-1 gene were: NN (dominant homozygous, normal), 0.75; Nn (heterozygous, normal carrier), 0,24; nn (recessive homozygous, affected), 0.01. Allelic frequencies for RYR-1 were: N, 0.87; n, 0.13. For the IGF-2 gene, six different alleles were found based in their size in base pairs, with the following allele frequencies: 232 (0.06), 236 (0.03), 238 (0.6), 244 (0.07), 246 (0.01) and 248 (0.23), conforming 12 different genotypes. The highest frequencies were for genotypes 238/238 (0.35) and 238/248 (0.28). Analysis of variance of the results showed no association among the productive and carcass traits analyzed with the genotypes of the genes studies, except for weaning weight for RYR-1 (p<0.01), as well as for birth weight and weaning weight for IGF-2 (p<0.05).
Guillermo Davalos-Aranda, Ruben Maldonado-Mena, Martha V. Garza-Zermeno, Sibilina Cedillo-Rosales, Luis C. Galan-Alejo and Victor M. Riojas-Valdes, 2010. Association among Ryanodyn Receptor and Insulin-Like Growth Factor Genes with Production Traits in a Commercial Type Swine Population from Mexico. Journal of Animal and Veterinary Advances, 9: 639-642.