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Influence of Cold on Liver Lipids of Rats at Different Levels of Dietary Protein

Biochemistry and Pharmacology Laboratory, U. S. Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760

The effects of feeding diets containing various levels of casein, and of exposure to an environment of 6°, on food intake, growth and liver lipid composition of rats were studied. Rats exposed to cold ate more of all diets than rats maintained at normal ambient temperature. The growth rate at 6° was greater than at 23.5° when they were fed diets containing 5% protein or less, but on diets of 10% protein or more, growth rate was less. Liver triglyceride levels rose with decreased dietary protein intake in rats maintained at normal ambient temperature. However, exposing animals to 6° had a lipotropic effect. In contrast to the response of liver triglycerides, the rise of phospholipid levels, at low protein intake, was not prevented by exposing the animals to 6°.

KEY WORDS: • dietary protein • liver lipids • cold environment • food consumption • growth rate

¹ Present address: Department of Biochemistry, University of Nebraska College of Medicine, Omaha, Nebraska 68105.

Manuscript received 30 August 1971.