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Conference paper2003

Validation of genetic evaluation methodology using the nonparametric bootstrap method

Weller, JI, Emanuelson Ulf, Ezra, E


Interbull currently uses three methods to validate genetic evaluation methodologies of member countries. In Method 3, the current genetic evaluation of each bull is analyzed as a function of its genetic evaluation four years ago. The δ factor is a function of the number of new daughters per bull during the past four years. If the evaluations are unbiased, the expectation of δ is zero. The official criterion for Method 3 acceptance is: |δ| < 0.01 (0.02) genetic SD if transmitting abilities (breeding values) are analyzed. Since the standard error of δ is a function of the population size and the number of bulls returned to service, the current criterion penalizes small populations. We therefore propose a new criterion based on the empirical confidence interval for δ computed by the nonparametric bootstrap. This criterion should more correctly reflect validity of the evaluation method for both small and large populations. The current and proposed criteria were evaluated on the Israeli Holstein population, and four anonymous populations. In many cases the current criterion would reject even though δ was not significantly different from zero

Published in

Interbull bulletin
2003, Volume: 31, pages: 26-29
Publisher: Department of Animal Breeding and Genetics, SLU


The 2003 Interbull meeting

    UKÄ Subject classification

    Animal and Dairy Science
    Veterinary Science

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