EFFECT OF DIETARY FATS ON SOME CHEMICAL AND FUNCTIONAL PROPERTIES OF EGGS

—Laying pullets were fed a low fat semipurified diet or the low fat diet supplement with 10% vegetable oil (corn, soybean, olive, safflower or hydrogenated coconut oil). The eggs were analyzed for change in the fatty acid composition of the total yolk lipids with time on the diet and for fatty acid composition of the triglyceride, cephalin and lecithin fractions of lipovitellin and lipovitellenin. Determinations were made for volume of sponge cakes, emulsification, and lipid content of stored eggs. A taste panel was used to assess any difference in flavor and mouth feel of yolk from stored eggs. The fatty acid composition of the total yolk lipids was influenced by all dietary fats. The major change was in the linoleic acid at the expense of oleic acid with corn, soybean and safflower oil. Olive oil increased the oleic acid and hydogenated coconut oil increased lauric, myristic and myristoleic acids. The fatty acid composition of the fractions of the lipoproteins was influenced by the dietary fats and varied between fractions. Differences were noted between sponge cake volume with eggs of low fat, corn oil, soybean oil and hydrogenated coconut oil diets. The dietary fats did not appear to affect emulsification capacity or migration of the yolk. A taste panel was unable to differentiate on the basis of flavor or mouth feel the egg yolk from the several treatments. Copyright © 1969, Wiley Blackwell. All rights reserved