Hello all, I'm Brian from Michigan.. My fiancés parents gave us 12 chickens that are just about 6 months old. They appear to be mix of New Hampshire and barred rocks. I was just wondering how long until I can expect to have them start to lay. Also I would like to give them field corn on top of crumble.. So do I need to give them grit? And if so how much? They will be in a 25x 25 pen with a coupe for the winter and hope to free range when the weather gets better. Thanks for the thoughts! I've done Cornish rocks before so this is a bit different!