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12 Cards in this Set
- Front
- Back
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What is the founder effect?
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Loss of variation when a small population formed from a larger one
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Linkage?
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Locus with undesirable allele closely linked to locus with desired allele
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Peiotropic effects?
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Allele has good and bad effects
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Problems with layer birds?
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Osteoporosis
Feather-plucking and cannibalism |
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Problems with meat birds?
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Lameness
Reproductive decline |
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What happens to fertility if broiler birds are fed ad libitum?
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Many ovarian follicles -> multiple ovulations - shell defects, double-yolked eggs etc.
Restricted food birds -> healthier and more viability -> but welfare concerns about if they are hungry |
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What might be linked to breeding for mitral valve disease resistance?
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Syringomyelia
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How to create a naturally tail bobbed Boxer?
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Cross Boxer with naturally bobbed Corgi, then the cross with Boxer etc.
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What are the welfare issues involved with naturally bobbing?
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Pregnancy wastage - 25% of embryos lost
Ethical? |
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What is the dominance for being horned in sheep and cattle?
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Sheep - horned is partial dominant
Cows - recessive |
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Drawbacks of polled sheep?
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Lack defining Scottish Blackface features
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What is an alternative to this breeding strategy?
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Breed for less aggressive animals - no need for polled animals
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