1 / 13

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

kimn
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related