In this study, the effect of including or excluding maternal effects in the animal model on estimation of genetic parameters and prediction of breeding values were investigated. Computer simulation was used to generate data sets according to the true model. True model consisted of direct and maternal additive genetic effects, covariance between direct and maternal additive genetic effects, and permanent and common maternal environmental effects. Simulated data were analyzed with nine animal models included different combination of these effects. Results indicated that maternal effects are important source of variation and neglecting these effects leads to inaccurate estimation of direct heritability and prediction of breeding values.

N. Khayatzadeh, A. Nejati-Javaremi, R. V Torshizi, M. Parvandi

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.25, 2006
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