I ordered some Cornish Crosses online and was surprised when I opened the box to find I had 10 Barred Rocks. The note on my order said they added ten MALES for extra warmth. Thats all fine and dandy but I live in the city and cant have Roo's. I know Barred Rocks are duel purpose breeds although I have never had this breed before... This is only my second year owning chickens. I currently have 5 laying hens, 1 Rhode Island Red, 1 Americana, and 3 Buff Orpingtons... My question is... Does anyone know how long it takes for the cockerels to get full size (or starts to crow)? And how big should I expect them to be? Thanks so much.