You've got very good instincts so far!So, with Moonshine and the Spitz chicks, egg #4 was started 1 1/2 days behind. Yesterday, I discovered mites in the little nest box they had been confined to. Mama was standing, trying to avoid the bugs. So I quickly moved them to their pen in the coop, egg and all. Mama abandoned the egg and stayed w the chicks. I brought the egg in the house and improvised a makeshift hatcher with a heating pad. The egg hatched this morning! So now I have this little orphan,
View attachment 1812799 and want to introduce it to mama after it gets active, hopefully today. The 3 other chicks are now 2 days old. @Faraday40 (and anyone else) any thoughts on how this might work out? Thanks!
btw I got permethrin poultry powder and treated mama hen and the coop, nest boxes after completely sweeping it out. Fingers crossed on that.

To add the chick, I'd wait for a time when mama is calmly sitting & staying on chicks. (probably when they settle down just before dark) Sometimes a mama will peck at a new/different chick as an intruder, so if the mama doesn't see the chick she won't peck at it. Just slip the chick under her & she won't be able to "see" it. Chick will feel cozy & should stay put. When they wake up in the morning, the chick has already spent the night & will most likely be considered part of the family.
It's best to check on the broody a few times in the beginning & again early in the morning.