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Okumura N.,JATAFF Institute | Matsumoto T.,JATAFF Institute | Matsumoto T.,Japan National Institute of Agrobiological Science | Hayashi T.,Japan National Agricultural Research Center | And 6 more authors.
Animal Genetics | Year: 2013

We performed a genome-wide association study using the porcine 60K SNP array to detect QTL regions for nine traits in a three-generational Duroc samples (n = 651), viz. generations 1, 2 and 3 from a population selected over five generations using a closed nucleus breeding scheme. We applied a linear mixed model for association mapping to detect SNP effects, adjusting for fixed effects (sex and season) and random polygenic effects (reflecting genetic relatedness), and derived a likelihood ratio statistic for each SNP using the efficient mixed-model association method. We detected a region on SSC6 for backfat thickness (BFT) and on SSC7 for cannon bone circumference (CANNON), with a genome-wide significance of P < 0.01 after Bonferroni correction. These regions had been detected previously in other pig populations. Six genes are located in the BFT-associated region, while the CANNON-associated region includes 66 genes. In the future, significantly associated SNPs, derived by sequencing the coding regions of the six genes in the BFT region, can be used in marker-assisted selection of BFT, whereas haplotypes constructed from the SSC7 region with strong LD can be used to select for the CANNON trait in our resource family. © 2012 The Authors, Animal Genetics © 2012 Stichting International Foundation for Animal Genetics.

Hirose K.,Central Research Institute for Feed and Livestock ZEN NOH | Mikawa S.,Japan National Institute of Agrobiological Science | Okumura N.,JATAFF Institute | Noguchi G.,National Federation of Agricultural Co operative Associations | And 8 more authors.
Animal Science Journal | Year: 2013

Vertnin (VRTN) is involved in the variation of vertebral number in pigs and it is located on Sus scrofa chromosome 7. Vertebral number is related to body size in pigs, and many reports have suggested presence of an association between body length (BL) and meat production traits. Therefore, we analyzed the relationship between the VRTN genotype and the production and body composition traits in purebred Duroc pigs. Intramuscular fat content (IMF) in the Longissimus muscle was significantly associated with the VRTN genotype. The mean IMF of individuals with the wild-type genotype (Wt/Wt) (5.22%) was greater than that of individuals with the Wt/Q (4.99%) and Q/Q genotypes (4.79%). In addition, a best linear unbiased predictor of multiple traits animal model showed that the Wt allele had a positive effect on the IMF breeding value. No associations were observed between the VRTN genotype and other production traits. The VRTN genotype was related to BL. The Q/Q genotype individuals (100.0cm) were longer than individuals with the Wt/Q (99.5cm) and Wt/Wt genotypes (98.9cm). These results suggest that in addition to the maintenance of an appropriate backfat thickness value, VRTN has the potential to act as a genetic marker of IMF. © 2012 Japanese Society of Animal Science.

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