Probably wouldn't leave them to their own in the pen with the big ones. Do you have a cage you can put them in inside of your run?
Let them see each other, and get used to seeing each other before they all go in together. From my personal experience, let that go on for 2 weeks or more then let them free-range together (if yours do that). Some pecking and chasing is normal after they're all together, as long as it isn't brutal. Pecking order and such.
They'll just keep attacking the new ones if there's no warm-up.
I'm not seasoned either but I should be a master-integrator by now.
But maybe one day. But until then, +1 grain of salt.
Let them see each other, and get used to seeing each other before they all go in together. From my personal experience, let that go on for 2 weeks or more then let them free-range together (if yours do that). Some pecking and chasing is normal after they're all together, as long as it isn't brutal. Pecking order and such.
They'll just keep attacking the new ones if there's no warm-up.
I'm not seasoned either but I should be a master-integrator by now.
But maybe one day. But until then, +1 grain of salt.