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The effect of simultaneous selection on the genetic correlation.

I McMillan1, R W Fairfull, M Quinton

  • 1Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada.

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Summary

Simulations show that simultaneous selection affects genetic correlations between traits. Changes in heritability and economic weights can alter the rate of change in genetic correlations over generations.

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Area of Science:

  • Quantitative Genetics
  • Animal Breeding
  • Statistical Genetics

Background:

  • Genetic correlations influence the response to selection for multiple traits.
  • Understanding these correlations is crucial for optimizing breeding programs.

Purpose of the Study:

  • To investigate the theoretical impact of simultaneous selection on genetic correlations between two traits over 20 generations.
  • To assess how heritability and economic weights influence these changes.

Main Methods:

  • Population simulation with 15 loci (5 trait 1, 5 trait 2, 5 pleiotropic).
  • Index selection applied based on heritability (h(2)) and economic weights.
  • 100 replicates for positive and negative initial correlations.

Main Results:

  • Positive initial genetic correlations tended to decline towards zero.
  • Negative initial genetic correlations tended to decrease towards -1.
  • Unequal heritabilities and economic weights slowed correlation changes, sometimes stabilizing them.

Conclusions:

  • Simultaneous selection dynamically alters genetic correlations.
  • Parameter changes over time can impact selection effectiveness.
  • Static genetic parameter assumptions may negatively affect overall genetic gain.