Lard definitely goes rancid.I have a corn feeder out in the woods for deer and squirrel's were climbing up and nawing at the feeder, first I smeared the legs with bearing grease, that worked for the coons but not the squirrels. then I top coated that with vasoline, they still managed to get up there. then I smeared lard on them, that didn't work either. then I put bird spike ribbons on them, that slowed them down but a few use them like a stairway. now, two weeks later when I walk up to it I can smell the lard. it's gone rancid for sure.