The crop of the birds is a sacking of the gullet on the neck. The mucous membrane of the crop contains glands. Both parents of the pigeons produce a secretion which is the crop milk, a few days before the young hatch. The secretion is vital for the development of the chicks. A pigeon's milk has a similar function as the milk of mammals.
Stem type: centuries old Asian breed
Breeding duration: 17 days