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Animal Breeding - Animal Science
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Definitions
_________________ (straight breeding): the mating of animals from the same breed.
_____________________: the mating of animals from two or more different breeds.
_____________________-two parental genes calling for a specific characteristic that
are identical
_____________________-two parental genes calling for a specific characteristic that
are not identical. (The dominant gene will override the effect of the recessive gene.)
Purebred Advantages:
- _______________________________________________________________.
- genetically homozygous
- _______________________________________________________________.
Purebred Disadvantages:
- _______________________________________________________________.
- Very expensive to start.
- _______________________________________________________________.
Advantages of Crossbreeding
- Used to improve genetics.
- _______________________________________________________________.
- Hybrid vigor, or heterosis, occurs from the combination of genes.
- _______________________________________________________________.
Disadvantages of Crossbreeding
- Often lack superior genes of purebreds.
- _______________________________________________________________.
BREEDING SCHEMES
_____________________: Mating of related animals
- close breeding: animals being mated are very closely related and can be
traced back to more than 1common ancestor.
i.e. Father and daughter
- most intensive form
- high presence of undesirable traits
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BREEDNG SCHEMES
_____________________: mating of animals that are more distantly related and can be
traced back to one common ancestor.
i.e. Cousin, grandparent to grand offspring, half-brother to half-sister.
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BREEDING SCHEMS
_____________________: the mating of animals of different families within the same
breed.
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Animals are not closely related
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_______________________________________________________________.Reduces
the changes of recessive genes appearing.
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_______________________________________________________________.
_____________________: the mating of a purebred sire to grade females.
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Grade animal is any animal not eligible for registry.
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_______________________________________________________________.
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Only one purebred sire is needed or artificial insemination can be done.
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_______________________________________________________________.Twobreed rotation
_____________________: Cross is made that the offspring are undesirable for
breeding.
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Ex. Smut face lamb (Black faced male on white faced female.)