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Evaluation & Use of Expected Progeny Differences in Beef Cattle

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Evaluation & Use of Expected Progeny Differences in Beef Cattle. Dr. Fred Rayfield Livestock Specialist Georgia Agricultural Education. To accompany lesson 01.432 - 3.2 Selection and Judging July 2001. Management Considerations. Assess your present cow herd

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  1. Evaluation & Use of Expected Progeny Differences in Beef Cattle Dr. Fred Rayfield Livestock Specialist Georgia Agricultural Education To accompany lesson 01.432 - 3.2 Selection and Judging July 2001

  2. Management Considerations • Assess your present cow herd • Assess your present breeding program • Assess your feed resources • Assess your land and labor resources • Determine your future direction and your target goal in production

  3. Expected Progeny Differences • Are a highly accurate means of predicting transmitting ability of animals as parents. • Describe genetic differences between animals within a breed.

  4. Accuracy of EPD’S • Accuracy measures reliability • Accuracy values range from 0(poor) to 1 (extremely high) • Accuracy simply tells us the data or EPD’S are not simply just a guess.

  5. Accuracy Ranges • Less than .40 Unreliable • .40 - .60 Look at these but risky • .60 - .80 Trustworthy • Greater than .80 Excellent reliability

  6. Are all breeds the same?? • No • Can’t compare across breeds • Different base points • Future developments may change this scenario

  7. Where do I Find Breed Averages ? • Sire Summary • Breed Publications • Breed Associations • AI Companies • Sire Catalogs

  8. What EPD’S Do I Consider ? • Birth Weight • Weaning Weight • Yearling Weight • Milk or Maternal • Marbling • Ribeye Area • Fat Thickness

  9. Do I Consider All EPD’S ? • Balanced set • Consider climate, nutrition and economics • Improve weaknesses in your cow herd • Do not implement unnecessary or unprofitable changes

  10. Final Analysis • EPD’S are a management tool use them wisely. • Genotype and phenotype are important • Only consider significant differences • Liars figure and figures lie ? • Utilize traits that will benefit your operation and your bottom line.

  11. You Could Produce This !!!! • This could be the result of an abundance of thought or an absence of thought. • Genetic wreck!!!!

  12. Economics of EPD’s Jimmy Scott Farm Business Management Georgia Agricultural Education

  13. Bull #1 BW +4 WW +20 YW +30 MILK +15 Sale Price $2,000.00 Bull #2 BW +2 WW +5 YW +15 MILK +10 Sale Price $1,500.00 EPD Economics

  14. Questions? • Is Bull #1 worth $500.00 more than Bull #2? • How can we economically tell which bull would be the best choice?

  15. Investment Analysis

  16. Conclusion • Bull #1 is the genetic and economic better choice.