I have no experience with broody hens but it seems logical that if you were going to sneak the incubator chicks under her you should do it at the same time her eggs hatch, not a day or so later. Once she takes a head count won't she realize the bigger extras were not there before?Do you think that I could place my bator chicks that will be born 1 week earlier than my chicks hatched by broody in with them a day or so after those have hatched? Or should I keep them separated. I'd like the hens to raise them but not if there's going to be casualties.