1 / 21

Have Phenotypic Trends for Carcass Traits Followed Genetic Trends?

Have Phenotypic Trends for Carcass Traits Followed Genetic Trends?. Dan W. Moser Department of Animal Sciences and Industry Kansas State University, Manhattan http://www.asi.ksu.edu. Market conditions More calf feds Harvesting younger Pounds still drive profit. Implants Drought

axl
Download Presentation

Have Phenotypic Trends for Carcass Traits Followed Genetic Trends?

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. Have Phenotypic Trends for Carcass Traits Followed Genetic Trends? Dan W. Moser Department of Animal Sciences and Industry Kansas State University, Manhattan http://www.asi.ksu.edu

  2. Market conditions More calf feds Harvesting younger Pounds still drive profit Implants Drought Select grade results in fewer no rolls Graders Reasons Why?

  3. All the previous “excuses” assume genetic improvement has been masked by management.

  4. Angus Carcass Genetic Trend

  5. Hereford Carcass Genetic Trend

  6. Limousin Carcass Genetic Trend

  7. Gelbvieh Carcass Genetic Trend

  8. Why has genetic progress been so slow? Response per generation = Heritability X Selection Differential

  9. Why has genetic progress been so slow? • Generation interval is +/- 5 years • Add another generation from seedstock to commercial cattle. • Variation within breeds is limited • A significant segment of every breed still ignores carcass traits

  10. How can we speed genetic progress? • Collect more carcass and ultrasound data • Use breed differences to increase rate of change in hybrids/composites • At some point, DNA technology may increase accuracy of selection for young animals

  11. How can we speed phenotypic progress? • Use appropriate breed combinations in crossbreeding systems • 50% British, 50% continental optimizes quality and yield grade

  12. Do Trends Need to Change? • Depends on supply/demand ratios of various product specifications • Better yield grades are always desirable • Grid factors should better reflect true value differences • Next round of the cattle cycle?

  13. Questions/Comments?

More Related