THE NUTRITIVE PROPERTIES OF THE "CROP-MILK" OF PIGEONS

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Abstract
In pigeons maintained on a standard mixed grain ration the content of protein, fat, ash, and water of the crop-milk was 18.8%, 12.7%, 1.6%, and 64.3% respectively. Feeding tests on 20 albino rats demonstrated that 4 gm. of crop-milk was about equal in antiophthalmic power to 1 drop of cod liver oil; and 3 gm. promoted growth at approximately the same rate as 0.1 gm. of dried brewery yeast. Although these vitamins are present in relatively low concentration, the total quantity presented to the squab which ingests crop-milk as its sole food is relatively great.

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