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Necropsy is basically an animal autopsy. Field necropsies can usually
be performed in around 30 minutes, and much of the time a diagnosis
can be made with a gross necropsy alone. If a gross necropsy isn't
diagnostic then samples can be sent into a laboratory for further
evaluation.
Necropsies can be done to diagnose a herd problem in order to
prevent further deaths or to determine the cause of death in an
individual animal.