In the male bird, the two testes are located inside the body. A narrow tube connects them to the cloaca in which the tube ends as a small raised papilla l. In the female, only the leaf ovary is functioning. The single ovary produces ovary by short stalks. The ovary also produces the yolk.
The infundibulum receives the yolk released by the ovary. Albumen and chalaza which hold the yolk and germ cell in position are formed in the magnum. The two shell membranes and the shape of the egg are formed in the isthmus. The egg shell is finally formed in the uterus after which the egg is laid through the cloaca.
Fertilization of the egg can take place as soon as the egg enters the oviduct when spermatozoa are present. Fertilization occurs before the formation o albumen