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Major Principles. Animals tend to resemble their parents and other close relatives.Crossbred animals tend to perform better than purebreds, and non-inbred animals tend to perform better than inbred animals.. Genetic Examples. Genetic Examples. Livestock Breeding Industry. Seedstock Producers Produces animals for breeding purposesSire producing herdsDam producing herds.
Major Principles of Animal Breeding

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1. Major Principles of Animal Breeding ANSC 3402 Animal & Food Sciences Jay W. Johnson

2. Major Principles Animals tend to resemble their parents and other close relatives. Crossbred animals tend to perform better than purebreds, and non-inbred animals tend to perform better than inbred animals.

3. Genetic Examples

4. Genetic Examples

5. Livestock Breeding Industry Seedstock Producers Produces animals for breeding purposes Sire producing herds Dam producing herds

6. Commercial Producers Animals are intended for entering the food chain. Many times buy herd sires May or may not produce replacement females. Livestock Breeding Industry

7. Livestock Breeding Industry

8. Livestock Breeding Industry Elite Breeders May or may not be hobby breeders Size of operation varies Use of advanced technology AI, ET, cloning

9. Livestock Breeding Industry Multipliers Dedicated Producers Livelihood Size of operation varies Use of advanced technology AI, ET, cloning - ?

10. Livestock Breeding Industry End Users May or may not be primary income Size of operation varies Limited in use of technology

11. Seedstock Business The seedstock business exists as a business only because of the demands of the commercial industry.

12. Seedstock Business Example 500,000 cows of breeding age

13. Seedstock Business 500,000 cows with an 80% calf crop weaned

14. Commercial Livestock Industry Demands are constantly changing Cattle Horses Sheep Pigs Chickens

15. Commercial Livestock Industry Generation Interval Extremely important

16. Improvement of Population Selection & ?.?

17. Mating Systems 3 reasons breeders use mating systems.

18. Selection & Mating For simply-inherited traits Mating to produce a particular gene combination Breeders should look at genotype & pedigree of the animals selected.

19. Mating System Repeated backcrossing Use to incorporate a specific gene that exists in one population into another. Take the initial cross and follow it with successive generations of backcrossing combined with selection for the desired alleles.

20. Backcrossing Ex. ? Gelbvieh fullbloods are reddish-yellow. Market is dictating that bulls be black. Where do we find the black gene?

21. Backcrossing F1 generation will be 50/50 Gelbvieh & ? Keep the black animal! Cross it back with another Gelbvieh. Resulting calf will be 75% GV and 25% ?. Keep the black calf; sell the red!

22. Backcrossing Take the 75%, 25% calf and cross it with another Gelbvieh. What is the resulting genotype? What is the percentage Gelbveih? Keep crossing until reach breed association standard for purebred status.

23. Considerations Backcrossing could also be considered a grading up or topcrossing mating system. Important to remember that grading up is not selecting for a specific gene or allele.


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