Quantitative Trait Loci Mapping for External Egg Traits in F₂ Chickens

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  • Goto Tatsuhiko
    Graduate School of Biosphere Science, Hiroshima University, Japan Japanese Avian Bioresource Project Research Center, Hiroshima University, Japan Present address: College of Agriculture, Ibaraki University, Japan
  • Ishikawa Akira
    Japanese Avian Bioresource Project Research Center, Hiroshima University, Japan Graduate School of Bioagricultural Sciences, Nagoya University, Japan
  • Yoshida Minori
    Graduate School of Biosphere Science, Hiroshima University, Japan
  • Goto Naoki
    Graduate School of Biosphere Science, Hiroshima University, Japan Present address: Institute de Sélection Animale B.V., The Netherlands-EU
  • Umino Tetsuya
    Graduate School of Biosphere Science, Hiroshima University, Japan
  • Nishibori Masahide
    Graduate School of Biosphere Science, Hiroshima University, Japan Japanese Avian Bioresource Project Research Center, Hiroshima University, Japan
  • Tsudzuki Masaoki
    Graduate School of Biosphere Science, Hiroshima University, Japan Japanese Avian Bioresource Project Research Center, Hiroshima University, Japan

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タイトル別名
  • Quantitative Trait Loci Mapping for External Egg Traits in F<sub>2</sub> Chickens

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Quantitative trait locus (QTL) mapping of external egg traits in chickens was carried out with 143 microsatellite markers using 388 F2 hens obtained from an intercross of a Japanese Large Game (Oh-Shamo) male and three White Leghorn females. External egg traits, such as the weight and length of eggs and the weight, thickness, strength, and color of eggshells were measured at three different stages of egg production, i.e. early, middle, and late stages. QTL analyses revealed 10 significant and three suggestive QTLs with main effects on external egg traits on chromosomes 1, 2, 4, 5, 8, 10, 11, 12, 17, and Z. The QTL alleles derived from Oh-Shamo, one of the indigenous Japanese breeds, uniquely increased most external egg traits, whereas some QTL alleles had opposite effects on phenotypic differences between Oh-Shamo and White Leghorn. The QTLs detected accounted for 3.09-15.39% of the phenotypic variances. Although the QTLs on chromosomes 5, 8, and Z were found throughout all three stages, the others were identified at only one or two stages. Epistatic QTLs for external egg traits were not detected in the present study. The age-related changes of our main-effect QTLs illustrate one aspect of the complex genetic basis of external egg traits.

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