Bayes factor for testing between different structures of random genetic groups: A case study using weaning weight in Bruna dels Pirineus beef cattle

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2007
Author
Casellas, Joaquim
Piedrafita, Jesús
Varona Aguado, Luís
Suggested citation
Casellas, Joaquim; Piedrafita, Jesús; Varona Aguado, Luís; . (2007) . Bayes factor for testing between different structures of random genetic groups: A case study using weaning weight in Bruna dels Pirineus beef cattle. Genetics Selection Evolution, 2007, vol. 39, núm. 1, p. 39-53. https://doi.org/10.1051/gse:2006030.
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Abstract
The implementation of genetic groups in BLUP evaluations accounts for different expectations of breeding values in base animals. Notwithstanding, many feasible structures of genetic groups exist and there are no analytical tools described to compare them easily. In this sense, the recent development
of a simple and stable procedure to calculate the Bayes factor between nested competing models allowed us to develop a new approach of that method focused on compared models with different structures of random genetic groups. The procedure is based on a reparameterization of the model in terms of intraclass correlation of genetic groups. The Bayes factor can be easily calculated from the output of a Markov chain Monte Carlo sampling by averaging conditional densities at the null intraclass correlation. It compares two nested models, a model with a given structure of genetic groups against a model without genetic groups. The calculation of the Bayes factor between different structures of genetic groups can be quickly and easily obtained from the Bayes factor between the nested models. We applied this approach to a weaning weight data set of the Bruna dels Pirineus beef cattle, comparing several structures of genetic groups, and the final results showed that the preferable structure was an only group for unknown dams and different groups for unknown sires for each year of calving.
URI
http://hdl.handle.net/10459.1/49283
DOI
https://doi.org/10.1051/gse:2006030
Is part of
Genetics Selection Evolution, 2007, vol. 39, núm. 1, p. 39-53
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