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Increasing pedigree contribution to dairy sire evaluation.

G R Wiggans, R L Powell

    Journal of Dairy Science
    |April 1, 1984
    PubMed
    Summary

    Improving sire evaluations using ancestor information enhances genetic predictions. Adjusting pedigree index for birth date and sampling methods offers better accuracy for future daughter performance, especially for fat yield.

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    Area of Science:

    • Animal Breeding and Genetics
    • Quantitative Genetics
    • Dairy Cattle Evaluation

    Background:

    • Sire evaluations are crucial for genetic improvement in livestock.
    • Accurate prediction of future daughter performance relies on robust ancestor information.
    • Current methods may not fully capture the value of pedigree data.

    Purpose of the Study:

    • To investigate methods for enhancing the contribution of ancestor information to sire evaluations.
    • To assess the predictive accuracy of modified pedigree indices.
    • To compare different approaches for incorporating maternal grandsire and dam information.

    Main Methods:

    • Utilized the Modified Contemporary Comparison method for sire evaluations.
    • Employed pedigree index (sire + maternal grandsire) adjusted for sampling program and birth date.
    • Analyzed trends in milk and fat yield for various dairy breeds (Holsteins, Ayrshires, Brown Swiss, Guernseys, Jerseys).
    • Computed correlations between daughter merit and pedigree index/group average, with and without accounting for residual trends.

    Main Results:

    • Birth date adjustments significantly impacted sire evaluations, particularly for Holsteins (milk yield: 7.3 kg/yr, fat yield: 0.36 kg/yr).
    • Pedigree index showed a higher correlation with daughter merit for fat yield compared to group average.
    • Accounting for residual trends further improved the correlation between predicted and actual daughter merit.
    • Replacing maternal grandsire evaluation with dam's Cow Index yielded marginal improvements.

    Conclusions:

    • Modified pedigree indices, adjusted for birth date and sampling, can improve sire evaluation accuracy.
    • These enhanced evaluations better predict future daughter performance than traditional grouping methods, especially for fat yield.
    • Dam's Cow Index offers limited additional predictive value beyond existing pedigree information.

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