goat-proof hog feeder?

My hunting lease is on a goat farm, so all of my feeders are set up with fences that deer can easily jump but goats can't (or won't).

I've been trying to figure out a way to use these feeders for hogs during the off-season while keeping the goats out - especially because the big ones have learned that ramming a feeder is a good way to shake more corn out (the main reason I started fencing feeders).

I tried cutting a small rectangle about 16" off the ground hoping that pigs can squeeze in while goats couldn't, but the goats discovered it in no time and I was back at square one.

Any ideas or suggestions?

I have goats. As stupid as they are they don't miss even the smallest opportunity. Like you said they don't jump but they will crawl through a tiny space. They will go through any space a pig can go through.

Yeah, they are sort of like guys in prison. They have nothing but time to figure out how to exploit the perimeter.