Ascholten
Free Ranging
Do know up front though, even though you provided your 20 hens with 5 or 6 individualized nesting boxes to accommodate all their egg laying needs in comfort, they will all fight over box 3, left corner to lay their eggs in 
If I may add to 3B's comments, most people eventually have to do 'something' with the run bottoms. Sooner or later you will need to remove all the stuff that's built up over time. Rare is the coop where it just magically, is not a problem. Most people compost it, use it for other gardening needs, or sell / barter it with others who will. Almost nobody just bags it up and throws it in the trash.
With that being said, having a varied mix to begin with on the bottom. Green / Brown compost material, just makes it really, Ready to go out of the box. Shovel it out and you can immediately use it in your flower beds, veggie rows, whatever, with minimal extra work needed to 'make' it ready. Little time savers mean a lot in the life of a gardener !
Aaron

If I may add to 3B's comments, most people eventually have to do 'something' with the run bottoms. Sooner or later you will need to remove all the stuff that's built up over time. Rare is the coop where it just magically, is not a problem. Most people compost it, use it for other gardening needs, or sell / barter it with others who will. Almost nobody just bags it up and throws it in the trash.
With that being said, having a varied mix to begin with on the bottom. Green / Brown compost material, just makes it really, Ready to go out of the box. Shovel it out and you can immediately use it in your flower beds, veggie rows, whatever, with minimal extra work needed to 'make' it ready. Little time savers mean a lot in the life of a gardener !
Aaron