1 / 15

Improvements in Dystocia National Genetic Evaluation System and Data Processing

Improvements in Dystocia National Genetic Evaluation System and Data Processing. Improving Calving Ease Evaluation. Data quality Increase MGS identification Improve detection of duplicate records Genetic evaluation system Add MGS effect to threshold model Estimate parameters.

jdoris
Download Presentation

Improvements in Dystocia National Genetic Evaluation System and Data Processing

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. Improvements in Dystocia National Genetic Evaluation System and Data Processing

  2. Improving Calving Ease Evaluation • Data quality • Increase MGS identification • Improve detection of duplicate records • Genetic evaluation system • Add MGS effect to threshold model • Estimate parameters

  3. Calving Ease Scores 1 = No problem during calving or calving not observed 2 = Slight problem during calving 3 = Moderate difficulty during calving 4 = Considerable force used during calving 5 = Extreme difficulty during calving

  4. Frequency of Calving Difficulty

  5. Data • 10 million calving reports since 1980 • Pedigree data • From production evaluation system Increased MGS ID from 57% to 73% • Additional 2.5 million pedigree records for cows without unique national identification Allowing inclusion of data that does not meet requirements for production

  6. Data Extraction Requirements • Calving Data • Single birth • Dam and sire of Holstein or Red & White breed • Sire age >18 mo and <15 yr • Birth date of Jan. 1, 1980, or later

  7. Sire – MGS Model • MGS effect included • Evaluations of bulls as service sires improved by partially accounting for mates • Maternal effect on calving difficulty provided

  8. Calving Ease Evaluation Statistics(Sire-MGS Model)

  9. Presentation of Evaluations • Evaluations converted to expected percentage of births that would be scored 4 or 5 (difficult) for heifers (%DBH)

  10. %DBH Distributions

  11. Changes in %DBH

  12. Sire and MGS %DBH Distributions

  13. Reliability • Calculated as inverse of diagonal • Overestimated due to assumption of perfect accuracy of parents

  14. Variance Component Estimation

  15. Status of Evaluation System • Test evaluations distributed to AI organizations • Web queries to display calving ease data available • First release of sire-MGS evaluations for calving ease in August 2002

More Related