The Effect of Change in the Amount of Data Used for BLUP on the Accuracy in the Estimation of Breeding Value in a Closed Herd

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  • BLUP法に用いるデータ量が閉鎖群における育種価推定の正確度に与える影響
  • BLUPホウ ニ モチイル データリョウ ガ ヘイサグン ニ オケル イクシュ

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Abstract

The effect of change in the amount of data used for BLUP on the accuracy in the estimation of breeding value was studied by computer simulation assuming a pig population of 10 boars and 40 gilts in each generation. Five generations of performance and pedigree data from a random mating population were generated for the three traits with different levels of heritabilities; i.e. 0.1, 0.3 and 0.5. The mating was basically random but close inbreeding, as sib-mating, was avoided. The rate of increase in the average coefficient of relationship was 2.4% per generation in the data. <br>The BLUP of breeding values of the animal model on the individuals in the last generation were obtained based on the various amounts of performance and pedigree data. The absolute and percentage increment in the accuracy of the prediction by means of increasing the amount of data were larger in the trait of low heritability than in that of high heritability. The accuracy was linearly increased with the increasing amount of data on the trait of low heritability; h2= 0.1. On the other hand, the increment in the accuracy was plateaud when we went back to the 3rd generation ancestor on the trait of high heritability; h2=0.5. As was expected, the accuracy in prediction was higher and more stable in the trait of high heritability than in the trait of low heritability.

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