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This Article Full Text (PDF) All Versions of this Article: jas.2007-0293v1 86/11/2833    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Uemoto, Y. Articles by Suzuki, K. Search for Related Content PubMed PubMed Citation Articles by Uemoto, Y. Articles by Suzuki, K.

Quantitative trait loci analysis on SSC 7 for meat production, meat quality, and carcass traits within a Duroc purebred population

Y. Uemoto^*, Y. Nagamine, E. Kobayashi, S. Sato, T. Tayama^*, Y. Suda, T. Shibata^# and K. Suzuki^*

^* Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori – Amamiyamachi, Aoba-ku, Sendai, Miyagi 981-8555, Japan , National Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, 305-0901, Japan , National Livestock Breeding Center, Nishigo, Fukushima 961-8511, Japan , School of Food, Agricultural and Environmental Sciences, Miyagi University, 2-2-1 Hatatate, Taihaku-ku, Sendai, Miyagi 982-0215, Japan ^# Miyagi Prefecture Animal Industry Experiment Station, Hiwatashi 1, Iwadeyama-cho, Tamatsukuri-gun, Miyagi 989-6445, Japan

k1suzuki{at}bios.tohoku.ac.jp

Abstract

Many QTL analyses related to meat production and meat quality traits have been carried out using an F₂ resource population produced by crossing 2 genetically different breeds. This experiment was intended to investigate whether these QTL were segregating in a purebred Duroc population that had been selected for meat production and meat quality traits during 7 generations. Sus scrofa chromosome (SSC) 7, for which significant QTL of intramuscular fat (IMF) and many other traits have already been reported, was studied. The polymorphism of 10 microsatellite markers that were arranged at about 20 cM intervals was investigated on 1,004 pigs. In the selected population, 954 progeny were produced from mating of 99 sires and 286 dams. The QTL analysis for a full-sib family population was examined with the multi-generation pedigree structure of the population. Variance component analysis was used to detect QTL in this population and was examined for the multi-generation pedigree population. In this study, multi-generational pedigree estimated IBD coefficients among sibs were produced using MCMC methods. The Maximum LOD score was found at the 70 cM position for the loin eye muscle area, at the 0 cM position for the pork color standard, and at the 120 cM position for the number of thoracic vertebra, but no significant QTL for intramuscular fat were detected on SSC 7. These results indicate that QTL analysis via a variance component method within a purebred population was effective to determine that QTLs were segregating in a population of purebred Durocs.

Key Words: Duroc pigs • meat quality • multiple generation • quantitative trait loci • selected population