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Related Experiment Videos

On estimating non-additive genetic parameters in chickens

M A Silva, P J Berger, A W Nordskog

    British Poultry Science
    |September 1, 1976
    PubMed
    Summary

    Genetic variance in Leghorn chickens was analyzed for economically important traits. Additive genetic effects were significant, while non-additive genetic variation was generally small, suggesting limited impact on most traits.

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    Area of Science:

    • Animal Genetics
    • Quantitative Genetics
    • Poultry Breeding

    Background:

    • Understanding genetic variance is crucial for improving economically important traits in poultry.
    • Leghorn populations are widely studied for their genetic contributions to egg production.

    Purpose of the Study:

    • To examine additive and non-additive components of genetic variance in Leghorn chickens.
    • To investigate sex-linked effects on economically important traits.
    • To assess maternal and additive genetic effects on egg production.

    Main Methods:

    • Analysis of over 9000 Leghorn birds from two populations.
    • Calculation of six covariances between various relatives.
    • Application of two statistical models based on least-squares procedures and weighted least-squares equations.

    Main Results:

    • Estimates of variance components for additive genetic, dominance, maternal, and sex-linkage effects were obtained.
    • Non-additive genetic components were highly variable and generally smaller than additive components.
    • Limited non-additive genetic variation was observed for most traits, except potentially for egg production rate.

    Conclusions:

    • Additive genetic effects play a more significant role than non-additive effects for most traits in Leghorn chickens.
    • The study considers potential negative correlations between additive and maternal effects impacting egg production.
    • Findings provide insights for selective breeding programs in poultry.

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