Mitzi I have 4-5 Roos that are grown with about 40-50 hens. It works out pretty well. When I want to hatch from the a certain group I pick the ones I want & stick them in a cattle panel style hoop house for a month or so. We do have some "special" birds that dont mix with the birds in the lean to - it is 48ft x 12 ft covered area then there is a fenced yard that is 48x16. Plus I let them free range. The yard is for when they are not able to come out when we are gone & such. The yard had green stuff in it last yr, but this season they have kept the yard pure dirt.