The object of the estimation of the variance of sire effects in a design with one factor of clasSificationcrhierarchal design is to estimate from it the additive variance of trait: °s “ ^ °\ As t*le covariance between half-sibs may be affected by systematic environmental effects - for instance, half-sibs may be born with a high frequency in one concrete seasondata are usually corrected estimating these effects and subtracting them from original data before solving the analysis of variance. Another way of facing the problem would be to estimate sire components'Of variance by solving a mixed model in which seasonal effects would be considered as fixed factors and sire effects as random factors. HENDERSON (1977) proposed a method of estimation of the variance of random effects in a mixed model, using the "BLUP" method.

There is very little experience in the use of BLUP for the estimation of the components of variance. In this work a comparison between the estimates obtained by ANOVA, made with data corrected by season and number of litter effects, and by BLUP is carried out.

Agustin Blasco, M. Baselga, F. Garcia, J. Deltoro

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 277-281, 1982
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