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Abstracts of Foreign Dairy Literature

ABSTRACT

BLANCHETIERE. Seasonal Variations of Some Mineral Elements of Milk. (C. R. des seances de la Soc. de Biol. (France), Vol. 92, p. 1295, 1925. Abstracted in Le Lait, Vol. 6, April, 1926, p. 290.)

In mixed milk furnished to the hospitals of Lens, the alkali metals sodium and potassium diminish in amount in winter, while the alkaline earth metal calcium increases in winter. This cannot be explained by any variation in the content of these elements in the food, nor by the theory of Taylor and Usband that there is an inverse relation between the composition of the milk and the rapidity of secretion, since the different elements do not vary in the same direction.

The author explains the phenomena by the fact that the vitamin A, which is ingested in greater quantity in summer, causes a greater retention of calcium in the organism, as shown, among others, by Hart, Steenbock and Hoppert, thus leaving less available for the milk.