豚の系統造成における線形計画による選抜と制限付きBLUP法による選抜の比較  [in Japanese] A Comparison of the Selection with Linear Programming and Restricted Best Linear Unbiased Prediction for a Closed Herd Breeding of Swine  [in Japanese]

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Abstract

形質の遺伝的改良量に希望改良量による制限を加えた制限付きBLUP (RBLUP) による選抜方法と希望改良量による制限のもとで総合育種価を最大にする種畜利用頻度と推定育種価 (EBV) に基づいた線形計画 (LP) による選抜の効果を比較した。また, 遺伝的改良量に制限を加えたこれらの選抜の効果を多形質のアニマルモデルのBLUP (MBLUP) に基づく総合育種価 (H) の予測量による選抜の効果と比較した。考慮した形質は, 1日平均増体重 (DG) と背脂肪の厚さ (BF) である。選抜は, 熊本県で造成された系統豚の第1世代の雄30頭から10頭を選抜することを仮定した。得られた結果の概要は次のとおりである。1) RBLUPでは, 母数効果の推定が出来ず, BFとDGのEBVは全ての個体で一定の比率であった。2) LPにより選抜された個体は, RBLUPで選抜された個体の80%, MBLUPのHの予測量で選抜された個体の70%であった。3) 遺伝的改良量に制限を加えたRBLUPとLPの, 選抜された個体のHの予測量の平均値は, 制限を加えなかったMBLUPのHの予測量で選抜した方法のそれの各々55%と71%であった。以上の結果から, LPによる選抜はRBLUPと同等であり, 遺伝的改良量に希望改良量による制限を加える必要がある場合, 推定育種価に基づいたLPによる選抜方法は豚の系統造成の種畜評価に有効と考えられた。

“Restricted best linear unbiased prediction” (RBLUP) with genetic gains of traits restricted by desired levels and “linear programming (LP)”, which maximize an aggregate genotype (H) under the proportinal restriction on genetic gains of traits, based on estimated breeding values (EBV) and frequency of mating were compared. And these selection methods with restricted genetic gains were compared with that for H based on multi-traits best linear unbiased prediction with an animal model (MBLUP). The traits considered were daily gain (DG) and backfat thickness (BF). Selection of the best ten from 30 boars in 1st generation of a closed herd of swine in Kumamoto was examined in alternative selection methods. The results obtained were summarised as follows: 1) The fixed effects were not estimated in RBLUP and RBLUP of breeding values were proportional in every boar. 2) Eighty percent of the boars selected by RBLUP, and 70% of the boars selected by MBLUP were selected also by LP. 3) The average of H in the boars selected by RBLUP and LP under the proportional resteiction on genetic gains of traits were respectively 55% and 71% of H in the ones selected by H based on MBLUP. From these results, it is concluded that the selection method with LP based on EBV is equivalent to RBLUP and is usuful for a closed herd in swine in case of need for restrictions on genetic gains of traits.

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 33(1), 14-18, 1996-03-11

    The Japanese Society of Swine Science

References:  10

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008441235
  • NII NACSIS-CAT ID (NCID)
    AN10202971
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0913882X
  • Data Source
    CJP  CJPref  J-STAGE  JASI 
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