Yes. I did this last night with a buff orpington that had been broody and sitting on infertile eggs for 2 weeks. I put day-old hatchery chicks under her at night. By early morning she had pecked 2 chicks almost to death (they had to be put down), and the other 3 were huddling in the far side of the coop to stay away from her. This was a terrible, sad experience. I won't do this again unless I try it with a hen who has a proven record of being a good mother.