My current flock is 21wks old and just getting into a laying pattern. I have 12 chickens: 3 AL, 3BO, 3EE, 3 RS. I am selling 4 of them this weekend to make room for 4 more. I have decided I want to stagger my flock a bit so we will continue to have eggs when others are molting. So, one EE, 2 BO, & 1 AL will be going; and I have placed an order for 2 white leghorns and 2 barred rocks. The day old chicks will ship the week of 9/30. I will, of course, brood them separately from my current flock. With an age difference of 6m, will it be possible to assimilate the 4 new birds into my current flock of 8; and at what age can I try? I am thinking when the chicks are old enough, I will carry the brooder cage over to my run from time to time -- so my girls can see and get used to the new chicks... but since this is my first time with chickens.... I need confirmation I am thinking this through correctly. Thanks so much!!