Any kind of veg peelings, soft veg or fruit that's past its best, mixed corn in summer. rolled corn in the winter and plenty of veg peelings as we eat more roasts in the winter than in summer. I do hang up the odd cabbage. Our neighbour is also my partner's brother and a brassica farmer, quite often we cut our own cauli and they love the leaves that we trim off.
I did make them some treat balls made from porridge oats, mixed corn, raisins, bits of veg and molasses, baked them in the oven on strings- they didn't last very long!
This morning they had a couple of lettuces, spinach, courgette and peppers past their best