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Economic selection index development for Beefmaster cattle I: Terminal breeding objective.

K P Ochsner, M D MacNeil, R M Lewis

    Journal of Animal Science
    |April 6, 2017
    PubMed
    Summary

    This study developed an economic selection index for Beefmaster cattle, prioritizing production efficiency over carcass traits for greater profitability. The index aids breeders in making genetic improvement decisions for terminal beef production systems.

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    Area of Science:

    • Animal Science
    • Quantitative Genetics
    • Agricultural Economics

    Background:

    • Beefmaster cattle are a significant breed in terminal production systems.
    • Optimizing sire selection is crucial for enhancing profitability in beef production.
    • Existing selection methods may not fully capture economic drivers in terminal systems.

    Purpose of the Study:

    • To develop a novel economic selection index tailored for Beefmaster cattle in terminal production.
    • To quantify the relative economic importance of various production and carcass traits.
    • To provide a tool for genetic improvement strategies in Beefmaster breeding.

    Main Methods:

    • Utilized national average prices (2010-2014) to define income and expenses.
    • Extracted phenotypic and genetic parameters from existing literature.

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  • Estimated economic values via simulation of 100,000 animals and partial derivative approximation.

    • Main Results:

    • Relative economic values (REV) were calculated for hot carcass weight (HCW), marbling score (MS), ribeye area (REA), 12th-rib fat (FAT), and feed intake (FI).
    • REV: HCW (91.29), MS (17.01), REA (8.38), FAT (-7.07), FI (-29.66).
    • Production efficiency traits, particularly feed intake, showed a greater impact on profitability than carcass merit alone.

    Conclusions:

    • The developed economic selection index effectively prioritizes traits influencing profitability in Beefmaster terminal production.
    • Focusing on production efficiency alongside carcass traits is key for maximizing economic returns.
    • The index offers a scientifically-grounded tool to guide Beefmaster breeders in sire selection for enhanced genetic gain.