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Journal of Dairy Science Vol. 48 No. 10 1305-1309
© 1965 by American Dairy Science Association ®
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Fatty Acid Composition of Hay1

H. E. Oksanen and B. Thafvelin

Department of Cattle and Sheep Diseases, Royal Veterinary College Stockholm and National Veterinary Institute, Stockholm, Sweden

ABSTRACT

Fatty acid composition of hay was studied by gas liquid chromatography. Timothy-grass, red clover, and tufted-hair grass were compared. The influence on fatty acid composition of timothy-grass of growth stage, harvesting methods, climatic factors, and artificial drying was studied.

In new-mown hay from the various species, a closely similar fatty acid pattern was observed. Approximately 50% of the total fatty acid content was linolenic acid. In timothy-grass cut at a late stage of growth a low linolenic acid content was demonstrated (21.8%).

Hay dried on poles largely maintained its original fatty acid composition for the entire experimental period. In cocked hay no changes occurred during fair weather. Coinciding with a period of rainfall a considerable decrease occurred in linolenic acid content (to 18.5%). Watering of cocked hay resulted in a successive change of the fat. Hay dried as a swath showed marked, successive changes of fatty acid composition even under favorable weather conditions. The decrease in linolenic acid content (to 11.7%) was more conspicuous if the hay was watered.

In new-mown hay, artificially dried in an electric oven, the linolenic acid content was higher than in a corresponding sun-dried sample.

FOOTNOTES

1 This investigation was made possible by grants from Jordbrukets forskningsråd.






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Copyright © 1965 by the American Dairy Science Association ®.