In this study, the effect of considering or neglecting covariance between genotype and environment in estimating variance components and heritability using stochastic computer simulation in selected and unselected populations were investigated. The results showed that for some traits for which there is a G * E covariance, a bias in estimation will be resulted for genetic parameters if covariance values are not considered. Heritability will be overestimated if there is positive G * E covariance and underestimated if this covariance is negative. Furthermore, observed selection response (OSR) and expected selection response (ESR) were compared in the presence of a correlation between genotype and environment and it was found that ESR was underestimated when there was a positive covariance, and overestimated with the negative covariance.

A. Nejati-Javaremi, A. Fallah, H. Mehrabani-Yeganeh, M. Moradi-Shahrbabak

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.26, 2006
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