I totally cleaned the poo shelf yesterday for my 5, 23 week pullets. This morning when I went out, there must have been 60 new droppings for the 5 birds. That's 12 per bird per night! Is this excessive? Are they getting too much scratch? They have access to layer mash, oyster shells and water at all times. Only 3 are laying, so the rest are just "processing" the food, not using it for egg development. Any thoughts?