Pigeon’s milk | nutritive substance | Britannica (original) (raw)

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pigeons

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  In pigeon
  …parents feed their young “pigeon’s milk,” the sloughed-off lining of the crop, the production of which is stimulated by the hormone prolactin. The nestling obtains this “milk” by poking its bill down the parent’s throat.
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  In columbiform
  Pigeon’s milk is similar in composition to mammalian milk and is also induced by the secretion of the hormone prolactin from the pituitary gland. Pigeons also are distinctive in their unusual manner of drinking, in which water is sucked in as a continuous draft, the…
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  In columbiform: Behaviour
  …become secretory, so that “pigeon milk” is available when the eggs hatch. From this time onward the crop gland gradually regresses, so that the young, by the time they are ready to leave the nest, are fed almost entirely on environmental supplies. The production of a highly proteinaceous milk…
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