Abstract
1. The effects of feeding diets containing 15% crude or refined low erucic acid Span rapeseed oils, refined regular rapeseed oil or lard to pullets on productive performance and the lipids of egg yolk were determined. 2. Productive performance was best with the low‐fat control diet, less good with the crude low erucic acid Span oil or lard‐containing diets, intermediate with the diet containing refined Span oil and worst with the diet containing regular rapeseed oil. 3. The various dietary treatments did not affect total lipid content of egg yolk but did affect the fatty acid composition of egg yolk lipids. 4. No substantial amounts of erucic acid were found in the eggs indicating that the hen is able to control the lipid concentration in egg yolk though control of the fatty acid composition of lipids is poorer.
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