Not much in winter, but to be fair mine rarely leave much behind, and I feed it on a piece of plywood, so they are able to consume it instead of it getting lost to the mud/ground.
Mix little bitty shreds of meat, veggies, or goodies (cooking scraps) up with a bunch of water and a little turkey gravy and freeze (essentially unfiltered stock with lots of bits). Dump out the block in the run. It slowly melts, and they'll have a delightful time pecking out half frozen tidbits...