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Related Experiment Videos

Selection strategies for limiting the increase in ascites while increasing growth in broilers.

I McMillan1, V M Quinton

  • 1Department of Animal and Poultry Science, University of Guelph, Ontario, Canada. imcmilla@uoguelph.ca

Poultry Science
|June 25, 2002
PubMed
Summary

Computer simulations compared selection strategies for fitness and production traits over 20 generations. Mass selection for production traits showed greater gains but reduced fitness, while using sib information and indicator traits mitigated fitness reduction.

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Area of Science:

  • Animal breeding and genetics
  • Quantitative genetics
  • Livestock production

Background:

  • Selection for production traits can negatively impact fitness traits in animal populations.
  • Understanding the genetic correlations and trade-offs between production and fitness is crucial for sustainable breeding programs.

Purpose of the Study:

  • To compare changes in a fitness trait under different selection intensities (5, 10, 20 generations) for a production trait.
  • To evaluate single-trait selection (phenotype vs. animal model) and two-trait index selection strategies.
  • To assess the impact of including sib information and an indicator trait on fitness trait expression.

Main Methods:

  • Computer simulations were used to model selection responses.
  • Single-trait selection for growth was performed using phenotypic data and animal model predictions (Best Linear Unbiased Prediction).

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  • Two-trait index selection incorporated a production trait and a related fitness trait or indicator trait.

    • Main Results:

    • Mass selection for production traits led to greater production gains but also increased the phenotypic expression of the fitness trait.
    • Animal model predictions under single-trait selection resulted in less production gain compared to mass selection for a fixed fitness increase.
    • Incorporating sib information and an indicator trait into selection indices effectively reduced the negative impact on the fitness trait's expression.

    Conclusions:

    • Selection strategies significantly influence the trade-off between production and fitness traits.
    • While direct selection for production can compromise fitness, utilizing genetic information from relatives (sib information) and related traits can mitigate these negative effects.
    • Optimizing breeding goals requires balancing economic traits with biological fitness for long-term sustainability.