Comparative Mechanisms of Cold Adaptation by Larry S. Underwood

By Larry S. Underwood

Comparative Mechanisms of chilly Adaptation

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2:238-244. , and P. Morrison. 1976. Seasonal changes in body composition of the Arctic ground squirrel, Citellus undulatus. Can. J. Zool. 54:74-78. S. Blix. 1979. A source of non-shivering thermogenesis in fur seal skeletal muscle. Science. (in press). , et al. 1951. The comparative physiology of temperature regulation and thermal insulation. Arctic Aeromedi. Lab. Tech. Doc. Rep. No. AF-33(038)12764. A. Hall. 1979. Quantitative electron probe X-ray microanalysis of electrolyte elements within epithelial tissue compartments.

Fed. Proc. 35:144-153. , et al. 1962. Thermal and metabolic measure­ ments on a reindeer at rest and in exercise. Arctic Aeromedi. Lab. Tech. Doc. Rep. Contr. AAL-TDR-61-54. S. 1971. Rodents. In Comparative Physiology of Thermoregulation. C. Whittow, ed. Academic Press, NY. 1-149 pps. , et al. 1961. The influence of climate on meta­ bolic and thermal responses of infant caribou. Can. J. Zool. 35:845-856. J. Boucher. 1972. Calcium, and the control of muscle activity. E. , eds. Elsevier Pub. , NY.

Tables. Nutrient d i g e s t i b i l i t y of forage. Nutrient Nitrogen (as t o t a l crude protein) Approximate D i g e s t i b i l i t y Relationships Biological values: milk 80% forage: high q u a l i t y 70% low q u a l i t y <60% 40-60% negative f o r low protein diets Calcium 40-60% Phosphorus 60-80% Body W e i g h t Magnesium variable milk 70% forage - 20-40% (depressed when K intake is very high) Sodium >90% Potassium low IOOI Sulfur negative t o 80% g, [SJ in Forage Nutrient Acquisition and Utilization in Arctic Herbivores 35 In the urea recycling process the importance of rais­ ing the biological value of protein as opposed to increasing protein synthesis per se9 warrants further study in arctic herbivores.

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