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Linoleic Acid Requirement of the Chick

Laboratory of Nutrition and Endocrinology, National Institute of Arthritis and Metabolic Diseases, National Institutes of Health, Bethesda, Maryland

The linoleic acid requirement of young male chicks was determined during 4- to 6-week periods on the basis of growth response and also the triene-to-tetraene ratio of fatty acids in liver and erythrocytes. Dietary fat levels in different experiments ranged from 3 to 8% and the dietary content of linoleic acid varied from 0.18 to 4.3% of calories. Maximal body weight was obtained with 0.9 to 1.1% of calories as linoleic acid, and these supplements also resulted in triene-to-tetraene ratios of 0.4 or less in liver. In erythrocytes, 1.3 to 1.8% of dietary calories as linoleic acid were required to produce triene-to-tetraene ratios of 0.4. The latter criterion indicates a maximal linoleic acid requirement under the conditions of these experiments of 1.8% of calories, whereas the criteria of growth and liver triene-to-tetraene ratio gave a requirement of 1%.