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Effect of Age and Dietary Fat on the Lipids of Chicken Muscle¹

Food Processing Department, Georgia Experiment Station, Experiment, Georgia

The influence of age, and type and level of dietary fat on muscle lipids of young chickens was studied. Total lipid and phospholipid levels in breast muscle were not significantly influenced by dietary fat, but were each significantly lowered with age. Phospholipids were generally higher in amounts of stearic acid and long-chain polyunsaturated fatty acids than neutral lipids, whereas neutral lipids contained higher quantities of oleic and linoleic acids. Each lipid fraction tended to assume the fatty acid pattern of the dietary fat with neutral lipids being affected far more than phospholipids. Age had comparatively little effect on the fatty acid content of neutral lipids, but tended to reduce the level of linoleic acid in phospholipids while increasing levels of polyunsaturated fatty acids having 20 or more carbons. The concentration and fatty acid composition of thigh muscle lipids showed approximately the same dietary-induced changes as those noted for breast muscle lipids.

Manuscript received 27 August 1964.