1 / 29

History of Selection From Phenotypes to Economic Indexes

History of Selection From Phenotypes to Economic Indexes. NBCEC Brown Bagger 2012 October 3, 2012 Darrh Bullock, University of Kentucky. Assumptions of Selection. Measurable Qualitative Quantitative Heritable Is there a resemblance between parents and offspring for the trait of interest.

mulan
Download Presentation

History of Selection From Phenotypes to Economic Indexes

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. History of Selection From Phenotypes to Economic Indexes NBCEC Brown Bagger 2012 October 3, 2012 Darrh Bullock, University of Kentucky

  2. Assumptions of Selection • Measurable • Qualitative • Quantitative • Heritable • Is there a resemblance between parents and offspring for the trait of interest

  3. History of Selection Appearance

  4. Appearance People’s Sexiest Man Alive 2010

  5. History of Selection • Appearance • Pedigree Information • Shorthorn 1846 • Hereford 1880 • Angus 1886

  6. History of Selection Appearance Pedigree Information Data Collection

  7. Body Composition Drugs Sex Rock and Roll Sushi Rice Meat Potatoes

  8. Heritability h2 Trait Low Reproduction Production Moderate Product High

  9. History of Selection Appearance Pedigree Information Data Collection Ratios

  10. Ratios Individual Measurement X 100 Contemporary Group Average 100 is average

  11. Contemporary Group 1Physics Test Score Ratio = 86

  12. Contemporary Group 2Physics Test Score Ratio = 116

  13. History of Selection • Appearance • Pedigree Information • Measurable Trait • Ratios • Breeding Values – C.R. Henderson • Pedigree and Phenotype • Development of EPDs

  14. EPDs • A prediction of the genetics a bull will pass on to his calves, when compared to other bulls within the breed • Take into account the actual measurement on the bull, all ancestral measurements and environment • Not a perfect science, so use as risk management tool

  15. Connectedness CG 1 CG 2 CG 2 CG 1

  16. Expected Progeny Differences Physics Score EPDs 25 Points 15 Points -5 Points

  17. Expected Progeny Differences 95 65 85

  18. EPD +35 lbs +20 lbs Direct Expect the average difference in offspring to be 15 pounds.

  19. EPD +25 lbs +15 lbs Maternal Expect the average difference in offspring of the sires daughters to be 10 pounds.

  20. Has Selection Worked? • Genetic Trends • All breeds show drastic changes in genetic merit of most traits. • Indicate that simultaneous selection for antagonistic traits is possible.

  21. Angus Genetic Trends

  22. Genomics (in the beginning) Physics Score MBV = 25 Points Physics Score EPD = 15 Points

  23. Genomics (now) Physics Score EPD = 15 Points Phenotype Acc .15 Physics Score EPD = 20 Points Phenotype + Genomics Acc .30

  24. Selection Index • Allows comparison on single value • Weights traits according to economic importance • Selection index = a1EPD1 + a2EPD2 + . . . + akEPDk

  25. Male Mate Selection Index $MM = 4(App EPD) -2(Comp EPD) + 1(Int EPD) + 3(Pers EPD) $MM = 4(App EPD) + 1(Int EPD) + 3(Pers EPD)

  26. Selection Index Index Values 35 45 15

  27. Summary I Win !

More Related