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Arquivo Brasileiro de Medicina Veterinária e Zootecnia
On-line version ISSN 1678-4162
PAIXAO, D.M. et al. Mapping of QTL on chromosomes 1, 2, 3, 12, 14, 15 and X in pigs: characteristics carcass and quality of meat. Arq. Bras. Med. Vet. Zootec. [online]. 2012, vol.64, n.4, pp.974-982. ISSN 1678-4162. http://dx.doi.org/10.1590/S0102-09352012000400026.
The accomplishment of the present study had as objective to map Quantitative Trait Loci (QTL) associated to carcass and quality traits in a F2 pig population developed by mating two Brazilian Piau breed sires with 18 dams from a commercial line (Landrace × Large White × Pietrain). The linkage map for this population was constructed after genotyping the 684 animals for 35 microsatellite markers. Data were analyzed by interval mapping using sex, batch and halothane genotype as fixed effects and carcass weight at slaughter, direct carcass weight and slaugher age as covariables. A total of 18 QTL were identified, the QTL for higher backfat thickness on the shoulder region and cooking loss was significant at 5% genome-wise level. The backfat thickness trait was mainly associated with the Piau breed allele, known as a fat pig. The information of the significant QTL detected in this study is useful for future fine-mapping studies for identification of genes and might be used together with traditional selection methods to improve the efficiency of breeding programs, moreover, this information can also provide new insights to the understanding of the physiology of the quantatiative traits in pigs.
Keywords : pigs; Piau breed; molecular marker; microsatellites.