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Crossbreeding Systems

Crossbreeding Systems. You shall keep my statues. You shall not let your cattle breed with a different kind;… Leviticus 19:19. Breeding Scheme Design. Crossbreeding One of the few “Free” things in beef production A crossbred cow returns about $90/year more than a straight-bred cow.

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Crossbreeding Systems

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  1. Crossbreeding Systems You shall keep my statues. You shall not let your cattle breed with a different kind;… Leviticus 19:19

  2. Breeding Scheme Design • Crossbreeding • One of the few “Free” things in beef production • A crossbred cow returns about $90/year more than a straight-bred cow. • A crossbred calf returns about $70/head more than a straight-bred calf.

  3. Evaluating Crossbreeding Systems • Use seven criteria: • Merit of component breeds • Hybrid vigor • Breed complementarity • Consistency of performance • Replacement considerations • Simplicity • Accuracy of genetic prediction

  4. Merit of Component Breeds • Each breed must bring favorable attributes to the mix • Would not choose Longhorn if having polled, heavy muscled cattle was important

  5. Hybrid Vigor • The most important reason for crossbreeding • Find a system that maximizes hybrid vigor

  6. Breed Complementarity • Big Bull x Small Cow theory • Sire x Dam Complementarity • Choose a maternal breed type for females

  7. Consistency of Performance • Produce as consistent of calf crop as possible • Some systems do a better job at this

  8. Replacement Considerations • The ultimate female is an F1 • How does the system produce females? • Can it produce F1 females?

  9. Simplicity • KISS principle should apply • It is very easy to overcomplicate production

  10. Accuracy of Genetic Prediction • Higher the accuracy of prediction, the lower the selection risk • More predictable offspring • EPD’s are a great tool to increase Accuracy of Selection

  11. Types • Rotation • Space • Time • Terminal • Static • Rota-terminal

  12. Spatial Rotation

  13. Rotation in Time

  14. Simple Terminal

  15. Complex Terminal

  16. Rota-terminal

  17. Heterosis

  18. System Attributes

  19. Questions

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