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What is the usual ratio of unsaturated to saturated fatty acids in egg yolk?

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The usual ratio of unsaturated to saturated fatty acids in egg yolk is 2 to 1.1

While this is the common ratio, some producers are able to market eggs with a higher proportion of unsaturated fatty acids by modifying the diet of the hen. For instance, adding fish oil to hen feed is a common method used to increase the levels of highly unsaturated long-chain omega-3 fatty acids in the yolk.1