I have increased my flock this year by incubating my own chicken's eggs. I've also filled a freezer with the non pullets.
I have put my last two groups out at one week in the coop with a heating pad. they are in their own cage until they decide which my last bites started perching at three weeks! I mean, up high. I was impressed. They do get a little run during the day for a week but after two weeks old the older chickens are used to them and I let the pecking order start. So far, all good. saves time, and money on feed. I do free range all my fowl. Still learning.

I have put my last two groups out at one week in the coop with a heating pad. they are in their own cage until they decide which my last bites started perching at three weeks! I mean, up high. I was impressed. They do get a little run during the day for a week but after two weeks old the older chickens are used to them and I let the pecking order start. So far, all good. saves time, and money on feed. I do free range all my fowl. Still learning.