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Journal of Animal Science Abstract - Quantitative Genetics

Bayesian analysis of the linear reaction norm model with unknown covariates1

 

This article in

  1. Vol. 84 No. 7, p. 1651-1657
     
    Received: Sept 14, 2005
    Accepted: Jan 31, 2006
    Published: December 8, 2014


    2 Corresponding author(s): guosheng.su@agrsci.dk
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doi:10.2527/jas.2005-517
  1. G. Su2,
  2. P. Madsen,
  3. M. S. Lund,
  4. D. Sorensen,
  5. I. R. Korsgaard and
  6. J. Jensen
  1. Danish Institute of Agricultural Sciences, Department of Genetics and Biotechnology, DK-8830, Tjele, Denmark

Abstract

The reaction norm model is becoming a popular approach for the analysis of genotype × environment interactions. In a classical reaction norm model, the expression of a genotype in different environments is described as a linear function (a reaction norm) of an environmental gradient or value. An environmental value is typically defined as the mean performance of all genotypes in the environment, which is usually unknown. One approximation is to estimate the mean phenotypic performance in each environment and then treat these estimates as known covariates in the model. However, a more satisfactory alternative is to infer environmental values simultaneously with the other parameters of the model. This study describes a method and its Bayesian Markov Chain Monte Carlo implementation that makes this possible. Frequentist properties of the proposed method are tested in a simulation study. Estimates of parameters of interest agree well with the true values. Further, inferences about genetic parameters from the proposed method are similar to those derived from a reaction norm model using true environmental values. On the other hand, using phenotypic means as proxies for environmental values results in poor inferences.

Copyright © 2006. Copyright 2006 Journal of Animal Science