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Quantitative trait loci analysis on Sus scrofa chromosome 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^*,1

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

¹ Corresponding author: k1suzuki{at}bios.tohoku.ac.jp

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 7, for which significant QTL of intramuscular fat 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 multigeneration pedigree structure of the population. Variance component analysis was used to detect QTL in this population and was examined for the multigeneration pedigree population. In this study, multigenerational pedigree estimated identical by descent coefficients among sibs were produced using Markov chain Monte Carlo methods. The maximum likelihood of odds score was found at the 70-cM position for the LM 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 QTL were segregating in a population of purebred Durocs.

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