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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.
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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.
Animals' feelings are very difficult to measure, which make the hedonistic view hard to work with on a practical level.
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