>your hasty expression "vet trade."

see what happens in the "rush to compete" hyla?

as to the question of what the OED has to say, I'd quote it all, but the upshot is that autopsy and necropsy are pretty much interchangeable in their eyes (and in the citations). (the first sense of autopsy is "Seeing with one's own eyes, eye-witnessing; personal observation or inspection"; the first sense of necropsy is "a post-mortem examination, an autopsy" -- no special limitations.)