The deep litter method
This is where the coop floor essentially becomes a composting system, and it’s the most efficient method of dealing with poultry manure.
The airier the litter, the better it will compost. Ideally, you want a thick layer of wood shavings on the coop floor, 10-15cm deep. Shavings absorb moisture quickly. The thickness of the layer helps to insulate the floor, helping the coop (and the composting layers) to stay warm.