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Operant Procedures for Assessing Behavioral Flexibility in Rats
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Choice of environments in reciprocal recurrent selection programs.

J Moreno-González1

  • 1Investigaciones Agrarias de Galicia, Apartado 10, La Coruña, Spain.

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|November 20, 2013
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Summary

Dual-environment reciprocal recurrent selection (DERRS) offers greater genetic gain than traditional reciprocal recurrent selection (RRS). This enhanced selection method proves more effective with increasing selection cycles and divergent dominance effects across environments.

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Area of Science:

  • Plant breeding and quantitative genetics
  • Agricultural science
  • Genetics

Background:

  • Reciprocal recurrent selection (RRS) is a key breeding strategy for cross-pollinating species.
  • Optimizing RRS for maximum genetic gain requires careful consideration of environmental influences.
  • Evaluating populations in single environments may limit the scope of selection.

Purpose of the Study:

  • To introduce and theoretically evaluate a novel breeding strategy: dual-environment reciprocal recurrent selection (DERRS).
  • To compare the efficacy of DERRS against traditional RRS in terms of genetic gain.
  • To identify factors influencing the performance of DERRS.

Main Methods:

  • Theoretical genetic modeling under two distinct environmental conditions.
  • Comparative analysis of genetic gain between DERRS and RRS across two genetic models.
  • Investigation of the impact of dominance effects and genetic covariances on selection outcomes.

Main Results:

  • DERRS consistently yielded higher genetic gain compared to RRS across both genetic models.
  • The advantage of DERRS increased with greater divergence in dominance effects between environments.
  • Increased selection cycles amplified the genetic gain differential between DERRS and RRS.
  • Lower genetic covariances between crosses in the two environments enhanced DERRS efficacy.

Conclusions:

  • DERRS represents a more effective selection strategy than RRS for enhancing genetic gain in cross-pollinating species.
  • The benefits of DERRS are particularly pronounced when environmental conditions exhibit divergent genetic effects.
  • This method holds significant potential for accelerating breeding progress in diverse agricultural applications.