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Journal of Dairy Science Vol. 48 No. 1 34-37
© 1965 by American Dairy Science Association ®
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Effect of Season and Stage of Lactation on Certain Polyunsaturated Fatty Acids of Milk Fat1

Carolyn Boatman, Donald K. Hotchkiss and Earl G. Hammond

Department of Dairy and Food Industry , Iowa State University ,Ames

ABSTRACT

Milk samples from individual cows selected to represent various stages of lactation were analyzed monthly over a year by the alkali isonlerization speetrophotometrie and lipoxidase procedures for their polyunsaturated fatty acid content. Linoleate was found to decrease during the first few months oflactation. Other polyunsaturated fatty acids did not vary with stage of lactation. Linoleate decreased when the cows were put on pasture. Nonconjugated trienoate and conjugated dienoate increased when the cows were on pasture.

FOOTNOTES

1 Journal Paper No. J-4934 of the Iowa Agricultural and tIome Economies Experiment Station, Ames, Project No. 1517. Supported in part by a grant from the American Dairy Association.






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Copyright © 1965 by the American Dairy Science Association ®.