I don't. I have raised walkways in the rabbit barn and, just leave the droppings to compost under the cages. The smell is not bad and, it adds a little warmth to the barn. Come spring, I'll muck it out for the garden and keep it mucked until about October, then let it be til spring again. I have as many as 30 at a time, if there are some in grow out. Summer when it's too hot to breed, just my core 8 breeders that are in rabbit tractors as long as a storm isn't brewing. Not a lot to muck in summer, but I have to clean it up 3-4 times over the summer.