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Carcass EPDs Integrating Carcass and Ultrasound

Carcass EPDs Integrating Carcass and Ultrasound. National Beef Cattle Evaluation Consortium Brown Bagger Seminar. October 22, 2008 Sally L. Northcutt Genetic Research Director American Angus Association ®. Decision Making Tools. Genetic Evaluation Models: End Product.

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Carcass EPDs Integrating Carcass and Ultrasound

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  1. Carcass EPDs Integrating Carcass and Ultrasound National Beef Cattle Evaluation Consortium Brown Bagger Seminar October 22, 2008 Sally L. Northcutt Genetic Research Director American Angus Association®

  2. Decision Making Tools...

  3. Genetic Evaluation Models: End Product • BIF Genetic Prediction Committee • BIF Board of Directors • BIF Guidelines revision passed June 9, 2007 • Jointly analyze carcass and ultrasound data and report in a carcass EPD format • Carcass weight, marbling, rib, and fat EPDs • Use an age-constant endpoint

  4. Genetic Evaluation Models: End Product • American Angus Association Board of Directors • June 2007 meeting • Approved to pursue combining the ultrasound and carcass AHIR® data to compute one set of carcass EPDs. • November 10, 2007 • Approved the release of new carcass EPDs with the Fall 2008 National Cattle Evaluation.

  5. Why New Carcass EPDs? • Simplify selection tools for commercial bull buyers using Angus genetics. • Consolidate predictions for animals with carcass and/or ultrasound data. • Focus on the economically relevant traits affecting quality and yield grade. • Enhance the genetic evaluation through improved prediction models. • Provide a platform for implementing future technologies for genetic improvement.

  6. Carcass Database  Initiated 1974  81,711 progeny records Fall 2008 Steers and Heifers • Sire/maternal grandsire model • 1979 base year • Pedigree-estimated Interims

  7. Ultrasound Database  Initiated 1998  935,548 Records Fall 2008 Bulls, Heifers, Steers • Animal model • 1997 base year • Interims may include individual performance deviation

  8. Trait Relationships Carcass traits Value and economic relevance Observed on fed steers and heifers Ultrasound traits Indicator traits Observed in yearling bulls/heifers Goal is to have genetic predictors for carcass traits.

  9. Genetic Parameters – Marbling and IMF

  10. Example: Marbling EPD Animal Model Marbling scores (steers and heifers) Ultrasound %IMF (bulls, heifers, and steers) MarblingEPD • EPD units are carcass marbling score. • %IMF data is an indicator of carcass marbling. • EPDs and ACCs are not directly comparable to previously published EPDs for carcass and ultrasound.

  11. A Marbling EPD (Marb) Bull A +.71 Bull B +.12 Difference .59 B Expected marbling score difference in future progeny Sire Comparison: Marbling EPD

  12. Education

  13. Carcass EPD Layout – Fall 2008

  14. Considerations • Accuracies on animals with no carcass progeny are dramatically reduced. • Breeders need to utilize percentile rankings and not focus on the absolute numeric EPD value. • If the EPDs change, then the $Value ($Grid and $Beef) rankings change.

  15. Genomics • Reproduction • Feed Efficiency • Herd Health • Carcass Merit Marker Assisted Selection Whole Genome Selection

  16. Genomic Selection

  17. Carcass EPDs Integrating Carcass and Ultrasound National Beef Cattle Evaluation Consortium Brown Bagger Seminar October 22, 2008 Sally L. Northcutt Genetic Research Director American Angus Association®

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