The fatty acid compositions in porcine serum, liver and muscle were changed under the conditions including exercise repression and shading. In respect of serum fatty acid, decreased in the contents of myristic acid, palmitic acid, palmitoleic acid and linolenic acid, and increases in the contents of arachidonic acid, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were found to be associated with those conditions. With regard to the fatty acids in liver, myristic acid, stearic acid, linolenic acid and arachidonic acid increased, and EPA and DHA decreased although these changes were comparatively small. The present results suggest that exercice repression and shading caused to release highly unsaturated fatty acids such as arachidonic acid, EPA and DHA from cell membranes of muscle and liver cells, rising the serum levels of these fatty acids, whereas the fatty acids constituting neutral fat such as myristic acid, palmitic acid, palmitoleic acid, stearic acid and oleic acid still remained in those cell membranes but not released.
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