1 / 12

What is an EPD?

What is an EPD?. Expected Progeny Difference “the differences in performance expected from the offspring of one individual compared to the offspring of another individual, within the same breed”. Ensminger and Perry, 1997. Birth Weight EPD. Indicates calving ease Measured in pounds of calf

katy
Download Presentation

What is an EPD?

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. What is an EPD? • Expected Progeny Difference • “the differences in performance expected from the offspring of one individual compared to the offspring of another individual, within the same breed” Ensminger and Perry, 1997

  2. Birth Weight EPD • Indicates calving ease • Measured in pounds of calf • Expected birth weight difference of calves, excluding maternal influence Johnson, 1997

  3. Weaning Weight EPD • Indicates growth performance at weaning (205 day weight) • Measured in pounds of calf Johnson, 1997

  4. Yearling Weight EPD • Indicates post-weaning performance (365 day weight) • Measured in pounds of calf Johnson, 1997

  5. Milk EPD • Measured in pounds of weaning weight produced by daughters • Excludes genetics for growth Johnson, 1997

  6. Total Maternal EPD • Calculated as follows: 1/2 weaning weight EPD + all of the milk Total Maternal EPD Johnson, 1997

  7. Scrotal Circumference EPD • Measured in centimeters • Indicates fertility and age at puberty of offspring Johnson, 1997

  8. Carcass EPDs • Carcass Weight (Pounds of carcass) • Marbling (USDA marbling degrees) • Ribeye Area (Square inches) • Fat thickness (Inches) Johnson, 1997

  9. Accuracy • Measures reliability of EPDs. • Young animals without a lot of offspring have lower accuracy • Animals with lots of offspring will have higher accuracy Johnson, 1997

  10. EPD Cautions • Not comparable between breeds, only within a breed • Average breed EPDs do not equal zero, look them up in latest sire summary for the breed Johnson, 1997

  11. EPD Cautions • EPDs do NOT predict absolute performance • The biggest is not always the best - use to fit animals to the environment (scenario) • Examples - milk and growth Johnson, 1997

  12. Breed Average EPDs Johnson, 1997

More Related