GENETIC+SELECTION

GENETIC+SELECTION - IMPROVINGWELFARE ,orchange theanimal...

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11/23/2010 1 IMPROVING WELFARE Change the environment, or change the animal GENETIC SELECTION Welfare problems related to genetic selection for desirable traits Other welfare problems that have strongly heritable aspects What about genetic engineering? GENETIC SELECTION Slow Many generations, involving large numbers of animals, to select for new traits while retaining previous selection advantage Need additive genetic variation for selection to be effective Moderately to highly heritable
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11/23/2010 2 Genetic Selection Selection ‘space’ Undesirable effects associated with selection to reduce problems E i Economic Create other welfare problems Limited usefulness in some situations PROBLEMS INTRODUCED BY SELECTION Lameness in broiler chickens, pigs, and large breeds of dogs Stress susceptibility in pigs selected for lean meat Other production related disorders (mastitis, Other production related disorders (mastitis, osteoporosis) Physical disabilities in dogs selected for various phenotypes BROILER CHICKENS Selection for: Feed conversion Conformation (broad b t) breast) Fast growth Now reach full adult weight in 6 vs. 17 wk
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11/23/2010 3 SELECTION FOR GROWTH Ascites Immune competence
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