I've decided to add 6 more hens to my flock of 9 I currently have. I believe my flock ages are 9 to 12 months now and the new ones are about 6 months. How can I introduce them to the same coop or do they need to stay seperate? I'm still new to the chicken farm just started in June 2019.
Might be better to wait until spring and add chicks, easier to integrate if your setup is conducive or can be made so.
Wait! What?.....you already have chicks brewing!?:
https://www.backyardchickens.com/threads/new-day-old-chicks.1346373/
Might want to think about this:
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/
I don't know how much room you have or how your room is set up. That is pretty important. If you have sufficient room it could be pretty easy. If space is tight it could be more of a challenge.
Very important!
@aart has a copy and paste section that gives the generic recommendations which are as specific as we can get since we don't know what you have to work with. Hopefully she is online and willing to share.
But, Of Course!
Integration Basics:
It's all about territory and resources(space/food/water).
Existing birds will almost always attack new ones to defend their resources.
Understanding chicken behaviors is essential to integrating new birds into your flock.
Confine new birds within sight but physically segregated from older/existing birds for several weeks, so they can see and get used to each other but not physically interact.
In adjacent runs, spread scratch grains along the dividing mesh, best if mesh is just big enough for birds to stick their head thru, so they get used to eating together.
The more space, the better. Birds will peck to establish dominance, the pecked bird needs space to get away. As long as there's no copious blood drawn and/or new bird is not trapped/pinned down and beaten unmercilessly, let them work it out. Every time you interfere or remove new birds, they'll have to start the pecking order thing all over again.
Multiple feed/water stations. Dominance issues are most often carried out over sustenance, more stations lessens the frequency of that issue.
Places for the new birds to hide 'out of line of sight'(but not a dead end trap) and/or up and away from any bully birds. Roosts, pallets or boards leaned up against walls or up on concrete blocks, old chairs tables, branches, logs, stumps out in the run can
really help. Lots of diversion and places to 'hide' instead of bare wide open run.
Good ideas for hiding places:
https://www.backyardchickens.com/threads/a-cluttered-run.1323792/