Accession Number : AD0770236

Title :   Dynamics of Free Fatty Acid Mobilization in Arctic Carnivores.

Descriptive Note : Final rept. Jul 70-Jul 73,

Corporate Author : ARCTIC INST OF NORTH AMERICA WASHINGTON D C

Personal Author(s) : Ferguson,J. Homer

Report Date : JUL 1973

Pagination or Media Count : 65

Abstract : Lipid content of the blood plasma of arctic mammals is higher than in temperate zone counterparts. These animals are apparently able to maintain a high concentration of free fatty acids without serious deleterious effects due to a slower-clotting time (wolf) and an increased utilization of saturated lipids. The diet is apparently balanced between saturated and unsaturated free fatty acids and does not differ significantly from food such as beef which might be available to temperate zone mammals. Seasonal fluctuation of plasma adrenocorticoids was found but did not effect plasma FFA significantly. Cold acclimation was found to be enhanced by shorter photoperiods after cold exposure, short photoperiod animals exhibited higher levels of FFA than did long photoperiod specimens. When cold acclimation was compared to exercise, similar results were obtained. An increase in muscle enzymes and heart hypertrophy was found in both situations. (Modified author abstract)

Descriptors :   *Fatty acids, *Metabolism, *Arctic regions, *Carnivora, *Lipids, Mammals, Low temperature, Acclimatization, Corticosteroid agents, Photoperiodism, Diet

Subject Categories : Biochemistry
      Anatomy and Physiology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE