I have 5 Narragansetts. 3 Toms, 2 hens that are 7mos old. I intend to butcher 2 of the Toms this winter and leave one for breeding the 2 hens. What is the age range that a hen is considered good for eating? Would 2-3 years old be too tough? I'd rather keep turning over my stock to keep them productive and avoid bonding to them if possible.