I had a hen that was hatching eggs and they were not hers she stole the first from another hen after she layed it. I also gave her eggs to hatch. The problem with my hen is she sat for the 21 days on the eggs and the hatched over several days and our temps were low. He have a brooder/space heater hanging over nest boxes and two heat lamps but the babies actually started freezing to death. By the time I got to the barn again she lost 4 of the 7 chicks and they were barely holding on. They are now in the house with us but we will not put them back untill the weather pulls in the 50's at least. As the inside of our barn is always a good 10-15 degrees higher than outside nbow that we redid the installation. Just can not wait until spring to finish putting paneling over it as they are peaking the stuff on the inside as we did not want to wrap outside of barn. So only two sides are done outside those that are inside the barn. Good luck my ducks and such set to start hatching again this weekend will be spending time with us indoors untill weather breaks.

Patricia