ANSC Mating Systems
Terms
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- What are two general classifications of animal breeders?
- seedstock breeders (purebred producers) and commercial breeders (producers)
- What are mating systems primarily identified by?
- genetic relationship of the animals being mated.
- What are two major systems of mating?
- inbreeding and outbreeding
- What is inbreeding? Do the offspring have an increased homozygosity or heterozygosity?
- the mating of related animals. homozygosity.
- What is outbreeding?
- the mating of animals not as closely related
- What are the two different forms of inbreeding?
-
intensive inbreeding
linebreeding - What is intensive inbreeding?
- mating of closely related animals whose ancestors have been inbred for several generations
- What is linebreeding? Why would a producer use this method?
-
a mild form of inbreeding where inbreeding is kept relatively low while maintaining a high genetic relationship to an ancestor.
already have high genetics in herd, can't find any genetics that are higher than his - What are the four types of outbreeding?
-
1. species cross
2. crossbreeding
3. outcrossing
4. grading up - What is crossbreeding? What are the two main reasons for crossbreeding?
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crossing animals of different breeds.
1. breed complementation
2. heterosis (hybrid vigor) - Is crossbreeding commonly used in swine, beef cattle and sheep?
- YEP!
- What is outcrossing?
- the mating of unrelated animals within the same breed
- What is grading up? What can it lead to?
- the mating of purebred sires to commercial-grade females and their female offspring for several generations. can lead to an animal being registered as a purebred animal)
- What are synthetic or composite breeds?
- new breeds formed by crossing several breeds