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Related Experiment Videos

Animal model evaluations for Mexican Holsteins.

R L Powell1, G R Wiggans

  • 1Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705.

Journal of Dairy Science
|April 1, 1991
PubMed
Summary

Genetic evaluations for Holstein milk yield in Mexico were adapted from the US animal model system. This study found significant differences in predicted breeding values based on sire origin, with US sires showing higher milk yield potential.

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Area of Science:

  • Animal Breeding and Genetics
  • Dairy Science
  • Quantitative Genetics

Background:

  • Holstein cattle genetic evaluations are crucial for improving milk yield.
  • Mexico's dairy industry requires robust genetic assessment tools.
  • Previous evaluations may not fully capture genetic potential due to differing methodologies.

Purpose of the Study:

  • To adapt and implement the US animal model system for genetic evaluations of Mexican Holstein milk yield.
  • To analyze differences in predicted breeding values based on sire origin (US, Canada, Mexico).
  • To develop methods for comparing and converting genetic evaluations between Mexico and the US.

Main Methods:

  • Adapted the US animal model system, modifying unknown-parent group definitions.

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  • Adjusted lactation records shorter than 305 days by expanding around the management group mean.
  • Computed genetic evaluations using 123,397 lactation records from 50,538 cows.

    • Main Results:

    • Implemented a new genetic evaluation system for 68,020 cows and 4573 bulls.
    • Estimated breeding value improvement of 87 kg milk in 1986.
    • Cows with US sires had significantly higher predicted breeding values for milk yield compared to Canadian or Mexican sires.
    • High correlations (.90-.91) were found between US and Mexican Predicted Transmitting Ability (PTA) for milk yield, with no sire by country interaction.

    Conclusions:

    • The adapted animal model provides reliable genetic evaluations for Mexican Holsteins.
    • Sire origin significantly impacts milk yield potential in Mexican Holstein populations.
    • Developed equations facilitate the integration of international genetic data for Mexican dairy improvement.