Pasteurized homogenized milk was analyzed for 2 yr for variations in the noncasein proteins. Milk was chemically fractionated into the principal noncasein fractions, and the concentration of each fraction was determined by Kjeldahl nitrogen and correlated with season. Data were analyzed statistically, employing (as the regression model) the first two terms of a trigonometric series. Results indicate that all of the fractions but one varied with season and the variation was cyclic in character. The total albumin fraction did not vary. Also, with the exception of fl-lactoglobulin, all of the fractions were highest in concentration during the sulmner and lowest in winter months, fl-Lactoglobulin concentration followed a reverse variation.
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Dellamonica et al. (1965) studied this question.
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