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The Addition of Carotenoids as a Means of Maintaining a Uniform Color in Milk as Measured by the Lac-Chrom-Meter

Department of Dairy Technology, Ohio State University, Columbus, Ohio

R. G. Washburn

Ohio Agricultural Experiment Station, Wooster, Ohio

ABSTRACT

Guernsey milk showed the highest amount of color according to the "Lac-chrom-meter" reading and a visual inspection. Green pasture increased the color of the milk of all the breeds studied. "Provalac" (a carotene concentrate) added directly to the milk increased the "Lac-chrom-meter" reading approximately 1.0 unit for each 300 micrograms of carotene added per quart of milk. It would require about 450 micrograms of carotene per quart to be added to winter milk in order to increase the color to somewhere near the maximum obtained when cows are on pasture. The "Lac-chrom-meter" reading cannot be used as a direct measure of the amount of carotene in the milk. Homogenization increased the "Lac-chrom-meter" reading. The higher the pressure, the greater the reading. The visual color was not increased in proportion to the "Lac-chrom-meter" reading. In the case of homogenization the "Lac-chrom-meter" reading increased proportionally more than did the visual color, while when carotene was added the visual color increased in greater proportion than did the "Lac-chrom-meter" reading.

¹ Now located at Colorado State College, Fort Collins, Colorado.