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Related Experiment Videos

Sire X environment interactions in beef cattle weaning weight field data.

J K Bertrand, P J Berger, R L Willham

    Journal of Animal Science
    |June 1, 1985
    PubMed
    Summary

    Sire environment interactions significantly impact Polled Hereford weaning weights. Accounting for these sire X environment effects is crucial for accurate breeding value estimation and regional analysis.

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    Area of Science:

    • Animal Science
    • Genetics
    • Quantitative Genetics

    Background:

    • Sire X environment interactions are critical in livestock breeding.
    • Understanding these interactions improves the accuracy of genetic evaluations.

    Purpose of the Study:

    • To examine sire X environment interactions in Polled Hereford weaning weights.
    • To evaluate the impact of herd, region, and contemporary group on sire progeny performance.

    Main Methods:

    • Analysis of 19,503 weaning weight records from the American Polled Hereford Association.
    • Utilized mixed-model sire analyses incorporating sire X herd/region and sire X contemporary group/herd random effects.

    Main Results:

    • Genetic correlations of sire progeny performance varied across different environmental factors (.59 across herds/groups, .37 across regions, .64 across regions).

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  • Heritability estimates for weaning weight were .11 (across regions), .17 (within region), and .28 (within herd).

    • Conclusions:

    • Mixed-model analyses should include sire X environment random effects for accurate prediction error variance estimation.
    • Separate regional analyses may be necessary to account for sire rank changes in specific regions.