Abstract
The effects of dietary 18 :3n-3 on the fatty acid composition of total lipids and lipid classes of pig tissues were investigated. Pigs (n = 25) were fed diets containing 18 :3n-3 at 0% (control), 1.5% (LNA1), 2.5% (LNA2), and 3.6% (LNA3). The total lipid content of the tissues was not affected by dietary treatment. Feeding LNA1, LNA2, and LNA3 diets increased (P < 0.05) the 18 :3n-3 and 20 :5n-3 content in the total lipids, triglyceride, phosphatidylethanolamine, and phosphatidylcholine of all tissues except brain. The enrichment of 18 :3n-3 was mainly in the triglycerides. Long-chain n-6 and n-3 fatty acids were incorporated in the phosphatidylethanolamine. Arachidonic acid and monounsaturated fatty acids were reduced in the phosphatidylethanolamine and phosphatidylcholine of all tissues except for brain by dietary 18 :3n-3. The 22 :6n-3 content of brain was not altered by dietary 18 :3n-3, indicating a resistance of brain tissue to dietary manipulation.
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