Data used for the genetic evaluation of the terminal sire sheep breeds in Australia originates from several genotypes and diverse environments. There are large differences in the levels of production and heterogeneity in variances. The aim of this paper is to report the predictive ability of estimated breeding values of sires for progeny weaning weight in low, medium and high production environments using different data transformations. The predictive ability was described by regressing offspring performance on sire EBVs. Five transformation methods were applied to account for heterogeneity of variance in the observed data. Phenotypes transformed to a proportion of the contemporary group mean, either as a percentage or in units of measurement, resulted in the most consistent EBVs across all production environments.

A. E Huisman, Daniel J Brown

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 04.07, 2006
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