Hey Guppy Guy,
The trick to introducing new birds to older ones is space and lots of it. Your birds are fairly young and the oldest are only halfway there to egg laying age. That being said they have established somewhat of a "pecking order" but at their age it is just getting started. I would let them in together supervised of course for an hour. then increase it the next day to a few hours. They will appear to aggressive at times to each other but it should not be anything you need to interfere in. This is normal in establishing the ranking. Just monitor them and immediately separate any birds that get injured (bleeding). Just note that all the ideas previously are really good advice but will not eliminate the inevitable squabbling in the establishment of a pecking order. This usually happens rether quickly and almost without notice. Good luck and Merry Christmas!
The trick to introducing new birds to older ones is space and lots of it. Your birds are fairly young and the oldest are only halfway there to egg laying age. That being said they have established somewhat of a "pecking order" but at their age it is just getting started. I would let them in together supervised of course for an hour. then increase it the next day to a few hours. They will appear to aggressive at times to each other but it should not be anything you need to interfere in. This is normal in establishing the ranking. Just monitor them and immediately separate any birds that get injured (bleeding). Just note that all the ideas previously are really good advice but will not eliminate the inevitable squabbling in the establishment of a pecking order. This usually happens rether quickly and almost without notice. Good luck and Merry Christmas!