Id like to grow my flock and get 12-18 more hens. Im thinking about buying 3 dozen RIR eggs and hatching them. (first attempt). But, where I live I can only have hens. Can someone give me the approx weeks that the following will happen? At what age am I going to be able to tell a roo from a hen? At what age will RIR roosters start to crow? At what age are RIR Roos big enough to cull and use for meat chickens? How young is too young to cull a bird for meat? Is my plan doable?