I had a similar problem, having rescued 4 ex batts last May, by August I was hooked and decided to get some more hens - I acquired a Light Sussex cockerel and so got 3 hens to go with him for meat birds, I also got 2 silkies to be my broodies and 2 araucanas for their blue eggs.
I decided to collect the chickens before their house was finished, but I had temporary housing set up. However made a really obvious mistake, the ex batts were in a large enough house so thinking there was a bit of room in there for 2 more hens I put the araucanas in. the other 6 lived together in a separate run of the same size. Those were all fine, apart from a little bit of squabbling and the silkies getting put to the bottom of the pecking order.
But the araucanas were subjected to some nasty bullying, to the point where they slept on the roof of the house while the other 4 went indoors. I should have rearranged everything sooner but being a beginner I made the mistake of giving the araucanas special treatment, like shutting the others out of the run so they could eat and drink. There was never any blood spilt though, they just avoided the big hens.
But it ended with the black araucana having her eye pecked so badly it had to be taken out - I actually couldn't tell at first, a real big scab formed over the wound, but again no visible blood. It cost me a small fortune at the vet but I owed it to her, she was still in really good form, eating and scratching around so I couldn't cull her. The vets had never done the op before, mainly because no-one in their right mind would spend 5x the cost of a bird getting it better, but she turned out brilliantly, the vet was so pleased with her.
Now all the flock live together in a gaden shed I've converted, the small hen house is available and the araucanas have the choice of going into either. They do still get the odd peck around the feeder or drinker but I have put out multiple feeding stations so they can just move somewhere else.
In hindsight I should have kept all the newbies together, even if it meant a bit less space for them, but I was thinking maths not chickens.
I did learn though and when the time came for full integration there were more newbies than the original 4 so they settled their differences quickly, and now they all free range together all day.
But if/when I bring more birds in I would have a larger number of new birds than the existing flock so they have the advantage. This might not be practical for everyone, effectively doubling your flock when you just want a couple of extras.
I would also strongly recommend to quarantine the new birds for a while. Even though I went to a breeder I met at the smallholding show I ended up with a bout of respiratory infection spreading through the flock and lice/mites that I don't think the ex batts had before. Goes to show their relative intensive conditions aren't great compared to us back yard lot.
One thing I am going to try soon as the weather picks up, one of the broody silkies has hatched a chick for me, and because it's been so cold they've been in a heated outbuilding, completely separate from the flock outdoors, so they are at risk of bullying, esp as she's so protective of her baby.
When the time comes I'm going to put a small self contained house and run inside the big chicken enclosure so they can all see each other but not get to them. I've been reading up and this seems to be the best way to introduce new members to the flock, I'll have to suck it and see to decide when they actually all go together.
It's a massive learning curve, the drama used to stress me esp as my hubby works away all the time, but now I take it in my stride. Oh and I check this website A LOT! Thanks everybody
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