I am going to raise 6 hens this spring/summer/fall. I want a dual purpose breed (layer and meat bird). I have wittled it down to three potential breeds: The Buff Orpington, the New Hampshire Red (or Rhode Island Red), and the Sussex. On average, at what age does each start laying and at what age should each be slaughter to get the best quality meat? I plan to slaughter them all by late fall. I want at least three laying for most of the summer. Can I raise different aged hens in the same coop/run? Thank you!