This was a short story from the 60's-70's.
The story was part of an anthology, perhaps from one of the magazines at the time (since it wasn't award winning material). A scientist (or doctor) at a hospital (college?) had an annoying pompous boss who was going to present irrefutable proof of man's descent from apes. The protagonist, (mainly for revenge) presented counter evidence about the similarities between humans and pigs, internally (since omnivores tend to have similar digestive tracts, and catch the same parasites); developmentally, (pig embryos & fetuses are often used as examples, or were, since they were very similar to human embryos and fetuses.) and even externally, (relatively hairless, sunburn, sweat, even put on 'sunscreen'.
Also mentioned the old "Long Pork" line of cannibalistic societies (maybe apocryphal). The punch line, I believe, was about the fact that the father of the scientific method was, of course, named "Bacon". Any help?