Tips to adding new chicks to pre existing flock

[DolceVita]

I currently have 3 black stars (3 years old) and they hate new birds. I’m getting on Saturday 3 2 week old hopefully female chicks. ( 2 Orpingtons and 1 Cochin). I plan not to even mix the 2 groups because the black stars are independent. BUT what should I do to ensure the safety of the new and old birds. Can disease become an issue? I’m getting them from a well known breader and have had a good past history. Any tips will be greatly appreciated! Also does anyone have a coop design for big ole birds like Cochins and Orpingtons?
Thank y’all

 

[MysteryChicken]

What I do, & it always works out is, I grow them up so they'd be half the size of the adult birds, & put the whole group into the coop at once.
These guys I put in the coop today with older birds, I think they're 3 months old now.

 

[Justso]

Hi DolceV,
You should quarantine your new birds, keep them separate for a few weeks. Watch your chicks for any problems.
What is your setup now? Do you have an enclosed run or do you free range?
With new chicks it's a good idea to "introduce" the soil from the property to them to build up their immunity. I will bring them a clump of grass, roots and all, or take them out in a small tractor to scratch around. I agree with MC, once they get big enough you could blend the flock, or keep separate, it's up to you.

 

[DolceVita]

Hi DolceV,
You should quarantine your new birds, keep them separate for a few weeks. Watch your chicks for any problems.
What is your setup now? Do you have an enclosed run or do you free range?
With new chicks it's a good idea to "introduce" the soil from the property to them to build up their immunity. I will bring them a clump of grass, roots and all, or take them out in a small tractor to scratch around. I agree with MC, once they get big enough you could blend the flock, or keep separate, it's up to you.

The current ones are not free run. I let them out for an hour or two and put them back up