At the point that "pig" gets into thing like "Ammunition, medicine, photo paper, heart valves, brakes, chewing gum, porcelain, cosmetics, cigarettes, conditioner and even bio diesel", you're not dealing with a PIG. Essentially it just so happens that on a molecular level, there's shit inside a pig that has other uses. I mean, moleculary speaking, there's no difference between a chicken and a pig, or a pig and a human, or a human and a fucking tree.
It's all just different elements stuck together.