Last year I started with 3 chickens. We've been through all 4 seasons and they are still doing well. Now I want to expand & add 7 more. I am building a new coop to hold 10 chickens, but am stuck on how many nesting boxes I need. Hopefully I will end up with 1 rooster and 9 pullets. Will 4 or 5 nesting boxes be enough ?