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Genetic Evaluation of Mixed Breed Populations

Genetic Evaluation of Mixed Breed Populations. Goals. Compare methods to evaluate mixed breed data All breeds and crossbreds together Crossbreds in breed of sire file Compute national evaluations and examine changes PTA’s of purebreds and crossbreds Display results without confusion.

phillip-contreras
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Genetic Evaluation of Mixed Breed Populations

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  1. Genetic Evaluation of Mixed Breed Populations

  2. Goals • Compare methods to evaluate mixed breed data • All breeds and crossbreds together • Crossbreds in breed of sire file • Compute national evaluations and examine changes • PTA’s of purebreds and crossbreds • Display results without confusion

  3. Options for Reporting PTA • Genetic base • Each breed on its own base • Other breeds on Holstein base • All breeds on mixed breed base • Heterosis and inbreeding • PTA can include or exclude heterosis • EFI and rank differ with mate breed

  4. Options for Implementation • Within breed of sire model • Further testing but fewer issues • May 2006 could be possible • All breed model • Traits in Net Merit need same base • Type and calving ease separate • November 2006 more likely

  5. All- vs Within-Breed EvaluationsCorrelations of PTA

  6. Breed Effects and HeterosisTransmitting ability differences from Holstein Heterosis and DPR estimates are from previous research

  7. Recent Sires of Crossbred CowsSires born since 1997

  8. Conclusions

  9. Conclusions • All breed model accounts for: • Heterosis • Unknown parent groups by breed • Heterogeneous variance by breed • Breed differences well estimated • PTA changed more in small breeds • Breed of sire model is alternative

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