It is well recognized that the milk of the dairy animal has a marked tendency to remain constant in composition even under adverse conditions, changes in the diet, particularly in respect to the inorganic constituents, not readily affecting the concentration of the various components.
In a review of the subject of milk secretion as related to diet, E. B. Meigs1 has given an exposition of the dietary factors influential in increasing or diminishing both the milk yield and the concentration of its various constituents, as brought out by the extensive experimental work which has been carried on with dairy and other animals. In brief, it has been found that in early lactation the cow has a remarkable power to secrete milk normal in yield and composition on inadequate rations, the shortage being supplied at the expense of its own body, as shown by loss of weight. In later stages
COURTNEY AM. THE EFFECT OF INADEQUATE DIET ON THE INORGANIC SALT CONTENT OF MOTHER'S MILK. Am J Dis Child. 1923;26(6):534-541. doi:10.1001/archpedi.1923.04120180033003