Chemical Composition of Milk

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Abstract
Data are presented on analytical determinations of 23 milk components in 258 bulk samples during a 21-month period. The statistical significance of seasonal and area differences in these components was measured. The area differences are due primarily to breed and are significant for all constituents with the exceptions of soluble organic P, citric acid, and Mg. Seasonal changes are significant for all constituents with the exceptions of proteose-peptone N, nonprotein N, organic P, insoluble organic P, and soluble Ca. Only the soluble forms of P, citric acid, and Mg show greater compositional variations due to seasonal changes than due to area differences. These may be responsible for seasonal difficulties in milk processing.