How to introduce 12 week and 6 week old birds to each other?

[WillowHavenFarm]

We bought 10 hens in March and another 3 at the beginning of May. They have been kept apart up until this point as we had a family issue come up that kept us from finishing our run and coop. They are currently residing in two chicken tractors. When we first introduced them to the tractors, my husband tried to put both sets in one to see if the new environment would cut down on the bullying but immediately some of the older birds started attacking the young ones. This was a suggestion from a TSC employee but didn't work with our birds.

Our run and coop will be done this weekend and I am wondering what the best way is to introduce the birds to each other that will cut down on the bullying.

TIA for any suggestions you have to share.

 

[Lazy Farmer]

Minus the quarantine part:
https://www.backyardchickens.com/articles/adding-to-your-flock.47756/

 

[KikiLeigh02]

Are the chicken tractors side by side?

 

[aart]

put both sets in one to see if the new environment would cut down on the bullying but immediately some of the older birds started attacking the young ones. This was a suggestion from a TSC employee but didn't work with our birds.

Our run and coop will be done this weekend and I am wondering what the best way is to introduce the birds to each other that will cut down on the bullying.

That can work...but not always.
With the new coop and run, you might try it again, especially if it is of good size.
If it doesn't work start a see no touch scenario by putting one of the tractors nest to the new run.

Here's some tips on.....
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.