Introducing Juveniles to an established Flock

After I've incubated my own eggs and brooded them in the basement for a while, I'll put them in a separate cage that I made out of a old ferret cage found alongside the road with a "free" sign on it. It works great I added hardware cloth to the end that was the bottom of the ferret cage (now the end) and the floor of the chick cage. Added training roosts to one end. The feeder for chick food is set in nestled plastic bucket bottoms to retain the food inside the cage (as much as possible anyway), the waterer is just a small rubber bucket which is easy to fill by pouring thru the cage. The handles and feet for the cage is made out of #9 wire. The ferret cage in this orientation has doors on the top for refilling the feeders/water and doors on the side that I can wire open in a couple weeks just enough to let the Juveniles out/in but not the adults to get in and eat their chick feed. I've been using this method for about 5 years now. (before, I had a different cage, I like this design better)