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Effects of Heritability, Genetic Correlation and Genotype X Environment Interaction on Expected Response From Selection for Efficiency of Strain-Cross Egg Production in Chickens
Abstract
Two major challenges have faced quantitative geneticists for considerable time: predicting the outcome of selection programs and explaining the response in relation to that expected. They are the beginning and the end of a selection cycle, for when responses fall short of expectations, new programs and new predictions must be considered. applied selection scheme involves, directly or indirectly, more than one trait and in commercial applications under many environments quite possibly a wide array of traits. Attempts at achieving predicted goals from within-line selection for egg production in chickens, however, have unearthed the paradox of plateaued response despite evidence of continued additive genetic variation. Possible reasons for such plateaus have been discussed by several authors (Lerner, 1951; Dickerson, 1955; Robertson, 1960; Falconer, 1967; Wright, 1969; Crow and Kimura, 1970 and others). Two partial explanations for such an apparent equilibrium are antagonistic relationships among the multiple objectives of selections and/or interaction of genotype and environment. Plateaued response and the need for a revised selection procedure were obvious in studies reported. The reasons for the plateau were more speculative.
Subject Area
Genetics|Animal sciences
Recommended Citation
EMSLEY, JAMES ALAN BURNS, "Effects of Heritability, Genetic Correlation and Genotype X Environment Interaction on Expected Response From Selection for Efficiency of Strain-Cross Egg Production in Chickens" (1973). ETD collection for University of Nebraska-Lincoln. AAI7412981.
https://digitalcommons.unl.edu/dissertations/AAI7412981