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In rats deficient in pyridoxine and essential fatty acids, liver phospholipids contained less arachidonic acid and more oleic and eicosatrienoic acids than those from animals only deficient in essential fatty acids. This pattern persisted after the animals were supplemented with linoleate for 6 days. Liver oleyl and arachidonyl CoA‐lysophospholipid acyltransferase activities were significantly higher in pyridoxine‐deficient animals. Supplementation with linoleate for 6 days resulted in a marked increase in arachidonyl CoA‐acyltransferase activity in pyridoxine‐deficient rats but a relatively small increase in the supplemented animals. Differences in fatty acid composition between pyridoxine‐deficient and supplemented rats can not be ascribed to lower liver transacylase activity in the deficient animals.

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