Chronic egg laying occurs when a female bird lays more than the normal number of eggs or, more commonly, lays repeated clutches of eggs, especially in the absence of a mate. The persistent laying of eggs may lead to malnutrition induced by the chronic depletion of calcium from the body for the production of the egg shells.
Egg binding is not uncommon in birds and may be resolved easily if treated early. Egg binding occurs when the female bird is unable to expel the egg from her body. If a prolonged period has elapsed since the bird began attempting to lay the egg, she may become critically ill. Birds with egg binding may or may not have passed an egg more than 2 days ago, are usually weak, not perching, often sitting low on the perch or on the bottom of the cage, and are straining as if trying to defecate or to lay an egg. Treatment varies depending upon how sick the bird is, as well as the location of the egg and the length of time the bird has been egg bound. Critically ill birds are first treated supportively for shock, and then attempts are made to extract the egg. If your veterinarian cannot see the egg through the vent, surgery under general anesthetic may be necessary to remove the egg from the abdomen. A hysterectomy (removal of the oviduct and uterus) is typically the last choice therapy, when medical and egg extraction through the vent are not possible.