We have three horses on about 3 acres right now. We don't pick up the manure. It usually gets stomped up or disentegrated with rain. If we picked all the poop up it would probably rip the grass up as well. I clean the shelter/stalls once a week and either put in the muddy spot in the pasture if its rained alot (its mostly straw) or collect it for the BOs to use in their garden.