“Moist heat is considered the safest remedy for egg binding in chickens. Put the hen in a cage with a wire floor. Place a large, flat pan of steaming water beneath the cage. Keep the water warm under her, but don’t keep it so hot that the steam burns her.
Provide some overhead heat from a heat lamp, and enclose the whole cage with a blanket or plastic to keep the moist heat in. Make sure it doesn’t get too hot, however. A thermometer can be used to keep the heat between 90 and 102 degrees Fahrenheit. Water should be available at all times for the hen to drink.
The hen should pass the egg in a couple hours with this treatment.”