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Preference theory (Success theory) holds the notion that the level of welfare relates directly to having desires or preferences fulfilled. The welfare of an animal depends on the satisfaction of preferences - a more preferred environment results in a higher level of welfare.
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Animalwelfareisthewell-beingofanimals.Thestandardsof"good"animalwelfarevaryconsiderablybetweendifferentcontexts. These standards are under constant review and are debated, created and revised by animal welfare groups, legislators, and academics worldwide.
Breeding of experimental animals includes strict control of the genetics, at least with rodents.
Hedonism deals with feelings and mental states that matter to the animal.
For the so-called narrow hedonism, it is easy to agree on which feelings are positive and which are negative, and to which extent they count.
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