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crop milk
Crop milk is a secretion from the lining of the crop of parent birds that is regurgitated to young birds. It is found among all pigeons and doves where it is referred to as pigeon milk. Crop milk is also produced by flamingos and some penguins.
== Comparison to mammalian milk ==
Crop milk bears little resemblance to mammalian milk, the former being a semi-solid substance somewhat like pale yellow cottage cheese. It is extremely high in protein and fat, containing higher levels than cow or human milk.〔Ehrlich, Paul R.; Dobkin, David S. and Wheye, Darryl (1988) (Bird Milk ). stanford.edu〕 It has also been shown to contain anti-oxidants and immune-enhancing factors.〔("Mysteries of pigeon milk explained" ) Retrieved September 22, 2011〕 Like mammalian milk, crop milk contains IgA antibodies. It also contains some bacteria. Unlike mammalian milk, which is an emulsion, pigeon crop milk consists of a suspension of protein-rich and fat-rich cells that proliferate and detach from the lining of the crop. In pigeons and flamingoes, both the male and female adult produce crop milk and share in the feeding and care of the young. In penguins, only the males lactate.〔 Lactation in birds is also controlled by prolactin, which is the same hormone that causes lactation in mammals.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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