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Genetic correlation and response to selection in simulated populations : I. Additive model.

R J Parker¹, L D McGilliard, J L Gill

¹Michigan State University, East Lansing.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik

|January 18, 2014

Summary

Truncation selection on a primary trait can decrease genetic correlation with a secondary trait, especially with high heritability and low selection intensity. This effect was observed over 30 generations in simulated populations.

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Area of Science:

Quantitative Genetics
Animal Breeding
Population Genetics

Background:

Genetic correlation influences the correlated response between traits during selection.
Understanding how selection affects genetic correlations is crucial for effective breeding programs.

Purpose of the Study:

To examine the impact of truncation selection on a primary trait's genetic correlation with a secondary trait.
To investigate the influence of selection intensity, heritability, and population size on this relationship.

Main Methods:

Computer simulations of genetic populations over 30 generations.
Additive gene action with 48 independently segregating loci per trait.
Varied genetic correlations, selection intensities, and environmental variances.

Main Results:

Genetic correlations remained stable when half of offspring were selected as parents.
When only one-fifth of offspring were selected, genetic correlations decreased, particularly with high heritability after 15 generations.
The reduction in genetic correlation was more dependent on the heritability of the selected trait than the selection intensity.

Conclusions:

Truncation selection can erode genetic correlations between traits, impacting correlated responses.
Heritability of the selected trait is a key factor in the magnitude of genetic correlation reduction.
Estimates of genetic correlation in small simulated populations can be unreliable.