A genome-wide scan for quantitative trait loci affecting respiratory disease and immune capacity in Landrace pigs

T. Okamura, W. Onodera, T. Tayama, H. Kadowaki, C. Kojima-Shibata, E. Suzuki, Y. Uemoto, S. Mikawa, T. Hayashi, T. Awata, N. Fujishima-Kanaya, A. Mikawa, H. Uenishi, K. Suzuki

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)


    Respiratory disease is the most important health concern for the swine industry. Genetic improvement for disease resistance is challenging because of the difficulty in obtaining good phenotypes related with disease resistance; however, identification of genes or markers associated with disease resistance can help in the genetic improvement of pig health. The purpose of our study was to investigate whether quantitative trait loci (QTL) associated with disease resistance were segregated in a purebred population of Landrace pigs that had been selected for meat production traits and mycoplasmal pneumonia of swine (MPS) scores over five generations. We analysed 1395 pigs from the base to the fifth generation of this population. Two respiratory disease traits [MPS scores and atrophic rhinitis (AR) scores] and 11 immune-capacity traits were measured in 630-1332 animals at 7 weeks of age and when the animal's body weight reached 105 kg. Each of the pigs, except sires in the base population, was genotyped using 109 microsatellite markers, and then, QTL analysis of the full-sib family population with a multi-generational pedigree structure was performed. Variance component analysis was used to detect QTL associated with MPS or AR scores, and the logarithm of odds (LOD) score and genotypic heritability of the QTL were estimated. Five significant (LOD > 2.51) and 18 suggestive (LOD > 1.35) QTL for respiratory disease traits and immune-capacity traits were detected. The significant QTL for Log-MPS score, located on S. scrofa chromosome 2, could explain 87% of the genetic variance of this score in this analysis. This is the first report of QTL associated with respiratory disease lesions.

    Original languageEnglish
    Pages (from-to)721-729
    Number of pages9
    JournalAnimal Genetics
    Issue number6
    Publication statusPublished - 2012 Dec


    • Landrace purebred population
    • atrophic rhinitis
    • immune capacity
    • mycoplasmal pneumonia
    • quantitative trait loci

    ASJC Scopus subject areas

    • Animal Science and Zoology
    • Genetics


    Dive into the research topics of 'A genome-wide scan for quantitative trait loci affecting respiratory disease and immune capacity in Landrace pigs'. Together they form a unique fingerprint.

    Cite this