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Studies in milk secretion The influence of proteins on the distribution of salts between blood and milk



Studies in milk secretion The influence of proteins on the distribution of salts between blood and milk



INTERNAT DAIRY CONGR ENG ED (Sect 2): 50-54



Since the calculated osmotic pressures of cow blood plasma and of milk are the same, the udder membrane is freely permeable to water. Na is more concentrated in blood serum than in milk, while K, Mg, and Ca are more concentrated in milk; samples of milk and serum dialyzed against each other maintained this relation. Proof that equilibrium had been established was obtained by removing the salts from samples of serum and milk. To the resulting solution of serum proteins the salts of milk were added and to the solution of milk proteins the salts of serum were added. When these solutions were dialyzed against each other the salts returned to the other side of the membrane so that the final solutions were identical with those from the first dialysis, showing that the distribution of inorganic cations between blood and milk is determined by the proteins.

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