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Holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen

Holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen. Sire Conception Rate. Implemented in August 2008 Based on: Last 4 years of breedings Up to 7 conventional semen breedings Parities 1 through 5 10 effects to predict bull conception rate

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Holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen

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  1. Holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen

  2. Sire Conception Rate • Implemented in August 2008 • Based on: • Last 4 years of breedings • Up to 7 conventional semen breedings • Parities 1 through 5 • 10 effects to predict bull conception rate • Sexed-semen breedings and heifer data not included

  3. Data • Derived 3 alternative models from SCR: • Sexed semen for cows • Conventional semen for heifers • Sexed semen for heifers • Service sire age groups condensed for sexed semen breedings due to limited number of bulls • Parity removed from models with heifer data

  4. Data • Based on January 2010 evaluation • Breedings from 2006 through 2009 • Publishable Holstein bulls were included • Bulls with ≥300 breedings in ≥10 herds overall and ≥100 matings during the last 12 months

  5. Number of bulls

  6. Mean number of matings/bull

  7. Statistical summary

  8. Correlations between SCR • Genetic correlation (rg) for true SCR below diagonal

  9. Correlations between SCR • Genetic correlation (rg) for true SCR below diagonal

  10. Correlations between SCR • Genetic correlation (rg) for true SCR below diagonal

  11. Correlations between SCR • Genetic correlation (rg) for true SCR below diagonal

  12. Correlations between SCR • Genetic correlation (rg) for true SCR below diagonal

  13. Conclusions • Fertility rankings for sexed semen differ considerably from conventional evaluations and warrants separate SCR • Combining cow and heifer breedings together in some manner would seem to be advantageous

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