Effect of Season on the Whey Protein Nitrogen Distribution of Pooled Milk

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Abstract
Pasteurized homogenized milk was studied for variations in the non-casein proteins. Milk was chemically fractionated into the principal non-casein fraction, and the concentration of each fraction determined by Kjeldahl N was correlated with season. All of the fractions but 1 varied with season, and the variation was cyclic in character. The total albumin fraction did not vary. With the exception of [beta]-lactoglobulin, all of the fractions were highest in concentration during the summer and lowest in winter months. [beta]-lactoglobulin concentration followed a reverse variation. The equation for the regression model and appropriate constants for each fraction as are the predicted maximum and minimum concentration values for each fraction plus the date these values are expected are included.