If there is any advantage to sour corn, this perhaps is it.

Everything in the forest eats corn, and the deer and raccoons seem to find it first. My personal belief is that the hogs don't particularly like sour corn and much as plain corn, but they will eat it and many other creatures won't. But, for me, it's simpler to just put out more corn or run a feeder than to deal with the mess of fermenting corn.

I have been known to throw out a package of Jello powder on top of the corn now and then, though. Can't really say if it helps, although once we used it to catch a large (295 Lb.) boar that previously wouldn't enter a trap.
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corn

Corn

buckets full of uneaten leftover or expired restaurant food. expired meat/seafood from the grocery store. expired bakery products from the store... if you can get any free without dumpster diving that is. helps if you work in the industry or have close friends/family in the industry...

We use two packets of jello, 4-6 cups of sugar, and water over the corn and mix it up. The corn will absorb quite a bit of it. Before using this method, we just used corn. The plain corn in the feeder didn't bring them in as quick.
There was also a few nights the corn would go untouched. I have yet to see or hear of the jello and sugar version going untouched.
I will be checking the traps today around 3 p.m.. I bet I have a piggie or 6.

Tonight I'll be trying fermented corn with lots of apples in it. The apples were free.
We also have two traps side by side. Maybe I'll put fermented corn in one and fresh jello and sugar corn in the other to see what the outcome is. I bet both traps end up with pigs

Anyone need a new/used ice chest?

Shrimp heads or shrimp hulls are hands down.

Never tried that. Would smell like $#!+

I have. Shrimp heads/hulls, crawfish heads/hulls, blue crab carcases, and fish carcasses. Brought in nothing but coons for me.

I can smell it from here

You took the time to cut up the food for the hogs?

Corn x infinity.

I did take the time to cut it and for the first time, my traps were empty for two days! Guess I shouldn't have jinxed myself.
Saw 20+ pigs but none in the trap. Guess they were still frightened from getting caught and slaughtered the week before.
Lots of tiny piglets running all over right now.

A corn feeder with a reliable timer has been a steady pig puller for me.

So when the miracle bait doesn't work, we attribute the failure to some form of supernatural jinxing, LOL. That seems par for the course.

you're giving away my secrets

A life-size, full color cutout of Miss Piggy?

You ever had a pig at your feeder?... What's in the feeder
Bingo.. Corn

Missy Piggy = Hilarious! Yeah I just used corn and couple hours of being down wind of sour corn was enough for me.

Let ya in on a little secret... Popcorn Bought a large bag of the unpopped seeds & planted em.... Have yet ta see a curnel nor hull come up yet...

Corn as others have said. Also put some "hog wild" attractant in with it. Never used corn alone so I can't say if it works without it but they dang sure come on a rope when we use both. Trapped 26 hogs in 3 days total trapping.