アニマルモデルによるBLUP法を用いた豚の産子数の改良と遺伝的趨勢  [in Japanese] The Improvement of Litter Size and its Genetic Trend using Animal Model BLUP in Pigs  [in Japanese]

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Abstract

産子数の増加を改良目標としたランドレースの系統造成を1990年から1996年にかけて実施し, その改良効果を評価した。また, 交配時体重と産子数の関係を分析し, 産子数の改良における遺伝的評価法について検討した。<br>第2世代からアニマルモデルによるBLUP法を用いた産子数の選抜を行った結果, 産子数の表型値は第2世代の9.7頭から第5世代の10.8頭へと世代とともに増加した。最小自乗分散分析により産子数に及ぼす世代と交配時体重の効果を分析した結果, 交配時体重に対する産子数の回帰は有意で (P<0.05), 回帰係数は0.03頭/kgとなったが, 世代の効果は有意ではなかった。この結果に基づき, 遺伝的評価として, 世代を母数効果とした場合と, 世代と交配時体重を母数効果とした場合の産子数の遺伝的趨勢を求めたところ, 世代当たりの遺伝的改良量は前者が0.14頭, 後者が0.09頭となった。

A strain development with Landrace pigs was carried out from 1990 to 1996 (for five generations) to improve reproductive ability and the meat performance. The pigs were selected mainly based on EBV of litter size with the BLUP method at 90kg of live weight, and mated atapproximately eight months of age. The mathematical model to analyze the data included the effects of generation and live weight of the females at the time of first mating. The average litter size per generation increased from 9.7 to 10.8 during the experiment. The regression of the litter size was significantly (p<0.05) affected by the weight at first mating, of which the regression coefficient was 0.03 piglet per kilogram of weight. Effect of generation on litter size was not significant. The genetic gain of litter size per generation was 0.14 on the model including generations and was 0.09 on that including both generations and weight of first mating. These results indicate that selection by the BLUP method is feasible for the improvement of the litter size of swine, and that it should be more effective if the body weight at the time of first mating is considered.

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 36(3), 111-116, 1999-09-30

    The Japanese Society of Swine Science

References:  14

Cited by:  4

Codes

  • NII Article ID (NAID)
    10008285328
  • NII NACSIS-CAT ID (NCID)
    AN10202971
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0913882X
  • NDL Article ID
    4879012
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-1082
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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