Construction and quantitative genetic analysis of traits for selection of breeding dogs in Asia Guidedog Breeding Network

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  • アジア盲導犬繁殖ネットワークにおける繁殖犬選抜のための選抜形質の導出と遺伝的パラメーターの推定
  • アジア モウドウケン ハンショク ネットワーク ニ オケル ハンショクケン センバツ ノ タメ ノ センバツ ケイシツ ノ ドウシュツ ト イデンテキ パラメーター ノ スイテイ

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Abstract

<p>In the Asia Guidedog Breeding Network (AGBN), behavior assessment test has been caried out to evaluate suitability for guide dogs. In this work, factor analysis was applied to the behavior assessment records of 693 Labrador Retriever evaluated from 2015 to 2018, and three principal factors were extracted as candidate traits for selection. The three factors were interpreted as composure, concentration on handler and ability to control stress. High heritability (0.71) was estimated for composure, whereas concentration of handler and ability to control stress showed low to moderate heritability (0.24 and 0.30). Genetic correlations were estimated to be high (0.65) between composure and ability to control stress and moderate (0.29) between concentration on handler and ability to control stress. Negative genetic correlation (−0.30) estimated between composure and ability to control stress would be an obstacle for simultaneous improvement of these two traits. Genetic trend in composure, that has been the trait emphasized in breeding of guide dogs in AGBN, showed a positive change after 2005. A positive genetic change was also estimated in concentration on handler, which would be a correlated response to the improvement of composure. Ability to control stress tended to decline presumably due to the negative genetic association with composure.</p>

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