I haven't trapped in a few years, but I did shoot the hogs inside my trap and preceded to catch others in just a day or two.

A couple of weeks ago, I walked up on a hog near my game camera and killed it. I went back to my house to get my cleaning knives, and when I got back (less than 15 minutes), I had pictures on my camera of other hogs eating corn around their dead litter mate.

I would say that a dead animal/blood might not bother them too much.