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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.

Arakawa A.,Japan National Institute of Agrobiological Science | Okumura N.,Institute of Japan Association for Techno innovation in Agriculture Forestry and Fisheries | Taniguchi M.,Japan National Institute of Agrobiological Science | Hayashi T.,Japan National Agriculture and Food Research Organization | And 6 more authors.
Animal Genetics | Year: 2015

Because of increasing litter size in Western pig breeds, additional teats are desirable to increase the capacity for nursing offspring. We applied genome-wide SNP markers to detect QTL regions that affect teat number in a Duroc population. We phenotyped 1024 animals for total teat number. A total of 36 588 SNPs on autosomes were used in the analysis. The estimated heritability for teat number was 0.34 ± 0.05 on the basis of a genomic relationship matrix constructed from all SNP markers. Using a BayesC method, we identified a total of 18 QTL regions that affected teat number in Duroc pigs; 9 of the 18 regions were newly detected. © 2015 Stichting International Foundation for Animal Genetics.

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