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Related Experiment Videos

Evaluation of between-line variation for within-line selection against ascites in broilers.

K H de Greef1, C Kwakernaak, B J Ducro

  • 1Institute for Animal Science and Health, Lelystad, The Netherlands. K.H.deGreef@ID.Wag-UR.NL

Poultry Science
|February 24, 2001
PubMed
Summary

Selection against ascites in poultry requires careful interpretation of between-line contrasts. While some traits show promise, within-line variation differs significantly, necessitating cautious application of between-line data for genetic improvement programs.

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Area of Science:

  • Animal Genetics
  • Poultry Breeding
  • Quantitative Genetics

Background:

  • Ascites syndrome is a significant welfare and economic issue in poultry production.
  • Identifying reliable selection criteria for reducing ascites incidence is crucial for genetic improvement.
  • Understanding the relationship between traits within and between different genetic lines is complex.

Purpose of the Study:

  • To investigate the utility of between-line contrasts for predicting within-line selection opportunities against ascites.
  • To develop and validate a composite trait (ascites indicator) for assessing ascites susceptibility.
  • To compare the genetic correlations of various traits with ascites both within and between lines.

Main Methods:

  • Utilized a dataset from a 10-line comparison of poultry.

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  • Employed Principal Component Analysis (PCA) to derive an ascites indicator (ASC_INDIC) from pathology data.
  • Analyzed correlations between mortality, pathology data, blood gas traits, and performance traits within and between lines.

    • Main Results:

    • The developed ascites indicator (ASC_INDIC) effectively ranked lines for mortality (r = 0.96), confirming its validity.
    • Between-line comparisons highlighted blood gas traits as promising for ascites selection.
    • Within-line analyses revealed high correlations between performance traits and ascites, distinct from between-line observations; blood gas trait correlations with mortality were reduced but maintained a similar nature.

    Conclusions:

    • Contrasts between genetic lines provide systematic but limited information for within-line selection strategies.
    • Line contrasts must be interpreted cautiously when assessing genetic variation and coherence within lines for traits like ascites.
    • The study underscores the importance of considering both within-line and between-line data for effective genetic selection programs.