Proportion of realized versus expected response was evaluated in several experiments with Tribolium, which were designed to compare selection index methods. It is suggested that discrepancies between observed and expected selection response are mainly due to the action of genetic drift interfering on the selection effects, and do not seem to be produced by environmental effects. Discrepancy is greater when restricted and/or antagonistic indices are used. Sampling errors of parameter estimates, especially that of the genetic correlation, seem to affect the response of these indices more than that of conventional indices.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 345–348, 1990
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