Resumen de Evaluación del uso de marcadores genéticos en la predicción del valor genético del contenido y composición de la grasa intramuscular en cerdo
Roger Ros Freixedes, Marc Tor Naudi, Ramona Natacha Pena Subirá, J. Estany
Intramuscular fat (IMF) content and fatty acid composition are important factors influencing pork quality. Genomic selection has been proposed as particularly useful for traits which are difficult to measure, and strong associations have already been found between single nucleotide polymorphisms at the LEPR and SCD loci and IMF content and composition. However, due to genotyping costs, the suitability of genomic and markerassisted selection programs should be assessed. We compared the accuracy of the breeding values predicted by four methodologies that differ in their use of phenotypic and genotypic information. Results indicated that good accuracies can be achieved by using only phenotypes if data from close relatives and correlated performance traits are available. Genomic predictions using high-density chips performed disparately in our study, but markers at the LEPR and SCD loci were enough to provide moderate to high accuracies for all traits. Data in the study were insufficient to assess the performance of single-step genomic BLUP, but BLUP accounting for genetic markers at the two studied loci as fixed effects provided the best accuracies. In conclusion, we recommend genetic evaluations for IMF and fatty acids content combining phenotypic records and singled-out genetic markers.
