Abstract
Abstract. Title of the paper: Long-term selection by asymmetric trait distribution A quantitative trait is assumed to be genetically affected by a polygenic effect and a major effect of a Single dialellic locus. Such a model is called mixed model of inheritance and the identified gene is denoted as quantitative trait locus (QTL). By choosing the part of the QTL-variance, the degree of dominance and the frequency of the favourable allele it is possible to generate distributions with given level of asymmetry characterised by skewness and kurtosis. If the ratio of QTL- and phenotypic variance is small (less than 8%), then genotype-environment interaction can be used in the mixed inheritance model to explain values of skewness and kurtosis estimated with poultry data. The Situation is considered where the environmental variances given for the three QTL-genotypes show a wide ränge. In most of these cases the short- and long-term selection does not effects the high values for skewness and kurtosis over multiple generations. Further the ratio of response to selection and the difference of selection depends on the selection intensity.
Highlights
Realisierte Heritabilitat in Abhängigkeit von der Remontierung bei s1 =0,2 (Realized heritability calculated for different selection intensities by s2 = 0.2)
Proceedmgs of the 6 World Congress on Genetics Applied to Livestock Production
Summary
Title of the paper: Long-term selection by asymmetric trait distribution A quantitative trait is assumed to be genetically affected by a polygenic effect and a major effect of a Single dialellic locus. The Situation is considered where the environmental variances given for the three QTL-genotypes show a wide ränge In most of these cases the short- and long-term selection does not effects the high values for skewness and kurtosis over multiple generations. Durch enUprechende Wahl des Anteils der QTL-Varianz an der phänotypischen Varianz in der Population, des Dominanzgrades und der Frequenz des positiven Allels lassen sich Verteilungen erzeugen, die einem gewissen Grad der Asymmetrie, charakterisiert durch Schiefe und Exzeß, genügen. Ist das Verhältnis aus QTL-Varianz und phänotypischer Varianz gering (kleiner als 8%), so muß im gemischten Modell der Vererbung Genotyp-Umwelt Interaktion zugelassen werden, um Werte für Schiefe und Exzeß, geschätzt an Geflugeldaten, erklären zukönnen. Ein derartiges Modell wird auch als gemischtes Modell der Vererbung (GMV), der herausgehobene Genort als Hauptgenort oder QTL (Quantitative Trait Locus) und die Varianz, verursacht durch das Hauptgen, als QTL-Varianz bezeichnet. Um Asymmetrien für den Quotienten aus SE und SD in Abhängigkeit von der Remontierung erklären zukönnen, müssen zusätzliche Annahmen über die polygenen und Umweltvarianzen innerhalb der verschiedenen QTL-Genotypen getroffen werden
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