I feed out 3-6 calves at a time on a year round basis. Hogs are starting to come to my bulk feeder and eat the feed. I keep the calves being fed out in a 20 acre field and fencing out the hogs is not an option. My extension agent has suggested penning the calves in a hog proof pen to feed them out, but I don't like that option. Any suggestions for hog proofing the feeder? I was thinking of re-building it to raise the trough such that the calves (700lb and greater) can feed but the hogs can't reach it. Anyone have experience with this hog problem? Any suggestions?