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Chapter 24

ANSC 101 Chapter Notes - Chapter 24: Heterosis, Outcrossing, Zygosity

Animal Science
Course Code
ANSC 101

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ANSC Chapter 24 mating systems and breeding
- Breeders make 3 choices (choose parents, determine rate of reproduction from each
individual, choose mating system to yield most results)
- Genetic improvement is optimized via selection and mating systems and mating systems
Animal breeders
- Seedstock producers purebred breeder
- Commercial producers crossbred breeder
Homozygous: Due to inbreeding
- A term designating an individual whose genes are alike for a particular trait.
Heterozygous: Due to cross of outbreeding
- A term designating an individual that possesses unlike genes for a particular trait
Mating Systems
- Inbreeding
-Intensive inbreeding
-Line breeding
- Outcrossing
-Species crossing
-Grading up
- Mating of closely related animals
- Benefits:
-Checks for defects
-Compiles valuable genes
- Disadvantages:
-Inbreeding depression-may reduce dominant genes
-Brings out defects
Intensive Inbreeding
- Several generations of inbreeding of multiple individuals
- Reproductive traits decline
- Used by corn breeders to make hybrids
Line breeding
- Mild inbreeding to keep a high genetic relationship to an ancestor or line of ancestors
- Identify superior animals
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