crossbreeding systems
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Crossbreeding Systems
You shall keep my statues. You shall not let your cattle breed with a different kind;…
Leviticus 19:19
![Page 2: Crossbreeding Systems](https://reader036.vdocuments.mx/reader036/viewer/2022081506/5681350f550346895d9c635d/html5/thumbnails/2.jpg)
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.
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Evaluating Crossbreeding Systems
• Use seven criteria:1. Merit of component breeds
2. Hybrid vigor
3. Breed complementarity
4. Consistency of performance
5. Replacement considerations
6. Simplicity
7. Accuracy of genetic prediction
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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
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Hybrid Vigor
• The most important reason for crossbreeding
• Find a system that maximizes hybrid vigor
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Breed Complementarity
• Big Bull x Small Cow theory– Sire x Dam Complementarity
• Choose a maternal breed type for females
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Consistency of Performance
• Produce as consistent of calf crop as possible
• Some systems do a better job at this
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Replacement Considerations
• The ultimate female is an F1
• How does the system produce females?– Can it produce F1 females?
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Simplicity
• KISS principle should apply
• It is very easy to overcomplicate production
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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
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Types
• Rotation– Space– Time
• Terminal– Static– Rota-terminal
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Spatial Rotation
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Rotation in Time
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Simple Terminal
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Complex Terminal
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Rota-terminal
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Heterosis
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System Attributes
System HV Comp Consistency Replacements Ease Accuracy
Two Breed Spatial
+ - Varies + + +
Rotation in Time
+ + Varies + ++ -
Static Terminal
++ ++ + - ++ +
RotaTerminal + + Varies + - +
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Questions