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Relation Between Lactose and Ash Content of the Milk of Different Mammals

Department of Dairy Industry, Cornell University, Ithaca, New York

ABSTRACT

The freezing-point depressions of the milk and blood of cows are essentially the same. The freezing-point depression of the milk is almost entirely due to lactose and salts. Milk from diseased udders or from cows in advanced lactation is relatively low in lactose, but this is compensated for by a higher salt content, the freezing-point depression remaining essentially unchanged (1, 2, 3). These alterations, particularly the increase in chloride content (4), are used for detecting abnormal milk. Since the blood and milk are essentially in osmotic equilibrium and the freezing point of the blood of the different mammals is much the same, one would expect the osmotic pressures of their milks to be about the same.

The milk of different mammals for which apparently reliable data on composition could be found ranged in average values for water from about 65 to 88 per cent; for ash from 0.23 to 2.5 per cent; and in lactose from 2.0 to 6.7 per cent.