A couple of years ago, I took the grandkids out fishing at a guy's catfish pond. The weather was so hot that the fish had quit eating catfish food when he put it out first thing of a morning, so we didn't expect to do as well as we had hoped. Sure enough, the cats wouldn't hit frozen skipjack, cured chicken liver, or any of several other baits I had brought along. Finally, I got down to the last bait I had brought along, which was about 1/2# of bacon that had set in the fridge so long we were afraid to eat it. I was surprised how well it stayed on the hook, and we not only got enough fish for the pond owner to have a couple of fish frys, but we released about as many as we caught.
That got me to thinking (always a dangerous thing). Bacon is pork (high-level thinking). Maybe other pork parts would catch catfish, too. About this same time, I was wandering through a cut-rate grocery store, and saw a 10# bucket of chitlings for $4.99. I cut the chitlings up into bait sized pieces, and separated them into ziploc bags with about a pound or so in each bag. I put garlic powder in one bag, and 3 shrimp flavor packets (from Ramen noodles) into another bag. I put the rest of the chitlings back for later 'doctoring'. The first time I used them, we couldn't catch any fish using skipjack or cured liver, but we did very well using the chitlings. It didn't seem to make any difference whether we used the garlic flavored ones, or the shrimp flavored ones. Since then, I've found that, like any other bait, chitlings isn't always going to be the best bait. In order of preference, I like fresh skipjack, fresh shad, frozen skipjack, and cured chicken liver. But one great thing about chitlings is that they will stay on the hook better than any other bait you've ever used. Last spring, I did try some 1/2" cubes of unflavored salt pork, and I think they will stay on a hook about as well as the chitlings; I just haven't given them an overnight try yet. We did catch a 16# blue on the salt pork; it was the only keeper catfish caught that day.