I have been raising chickens for the past six years. We have never mixed flocks before. This year my wonderful husband made a large chicken run and coop that can house all of our chickens. We have five adult hens and 17 eight week old pullets. I have been doing a lot a reading about mixing flocks but was hoping to get help from people who have done it successfully before. I was wondering when I can mix my younger chicks with my older ones and how to go about feeding the different groups. Both groups are heavy breeds such as Barred Rocks, Delawares, Buff Orpingtons, and Black Australorps. Any help would be appreciated.