Not sure if it really works or not, but my grandmother who raised chickens all of her life would take a bucket or something and fill it with water and then add ice to it. Then she would take her broody hens and put them just far enough that their belly's would be down in the water. She would hold them there just for a few mins then take them out and put them into a cage. From what I remembered, in just a few days, she would turn them back into the pens with the other layers. I raise bantams and never have tried it, because I let them hatch their own eggs, so not for sure if it is a for sure thing or not. It may be something that some one might want to put to the test and see if it really works or not.