i have (2) 4 month old BR pullets, & (1) 3 month old austrolorp pullet, can they be safly put in a run & coop with 2 yr.old hens & roo?? or are they still to young?
If they are about the same size, introduce them and release. Takes up to a month for the fighting to stop. Do a search with "adding hens" "introducing pullets" and so on and you'll find a good number of threads with lots of ideas and opinions. No one way is right.