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Why do we need to assess pain - why not just give an analgesic?
Large numbers of animals undergo surgical procedures as a necessary part of biomedical research projects. It is important that these animals receive sufficient analgesics to control their pain without receiving too much, as this could cause damaging side-effects.
A recent survey of analgesic use in small rodents (Ref #6), reported that many animals did not receive post-operative pain relief.
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