We have 9 Buckeye chicks that are 6 weeks old. Lots of feathers and about 9 inches tall. There are 9 adult Buckeye girls in the coop/ fenced run. Can we put the young ones in the coop at this age difference? Six years ago we put little ones in with adult birds and one of the young ones got pecked to death. We are in central Ohio and the forcast is for mild weather. Do the young ones need to be shut in the coop for a period to recognize it is home?