Evaluation of quantitative trait loci affecting intramuscular fat and reproductive traits in pigs using marker-assisted introgression

S. Sato, C. Ohnishi, T. Kikuchi, K. Kohira, S. Egawa, S. Terai, T. Nakamura, S. Arata, A. Komatsuda, Y. Uemoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We investigated the effects of previously identified quantitative trait loci (QTL) in an experimental backcross (BC) between Chinese Meishan pigs and commercial Duroc pigs. We performed marker-assisted introgression of two QTL for intramuscular fat (IMF) content (IMF population) and three QTL for reproductive traits (reproduction population) from a donor Meishan pig into a recipient Duroc pig. At the fourth BC generation of the IMF population and third BC generation of the reproduction population, carrier animals were selected for the production of animals homozygous for the QTL. Our previous studies have shown that the presence of a Meishan allele on the IMF QTL is associated with low IMF values, and the Meishan allele on the reproductive QTL is associated with large litters. In this study, the presence of a Duroc allele at the IMF QTL on SSC9 resulted in a 0.27% increase in IMF (additive effect = 0.27 ± 0.08), whereas the presence of a Meishan allele at the IMF QTL on SSC7 resulted in a 0.34% increase in IMF (additive effect = -0.34 ± 0.09). The presence of the Meishan allele at the IMF QTL on SSC7 thus had the opposite effect to our previous studies, that is, increased IMF. In the reproduction population, we observed no differences between the genotypes of the three QTL in regard to number of corpora lutea or litter size. Marker-assisted introgression at these QTL is thus unlikely to result in an associated increase in litter size. These results show that it is possible to introgress alleles from other breeds into a selection population using molecular markers; any unexpected results might be associated with the genetic background.

Original languageEnglish
Pages (from-to)799-807
Number of pages9
JournalAnimal Genetics
Volume45
Issue number6
DOIs
Publication statusPublished - 2014 Dec 1
Externally publishedYes

Keywords

  • Meishan
  • backcross
  • heritability
  • microsatellite marker
  • population

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Genetics

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