Apart from using various feeding strategies the scientists also chose to use two very different hen lines. One was a modern, specialised egg layer, which has found application in organic egg production, while the other line was a traditional dual-purpose hen that could deliver both eggs and meat.
Egg quality was measured with regard to carotenoid content, appearance, taste, shell strength and albumen quality.
Dr Hammershøj said: "We found that there were marked differences in egg quality between the two types of hens. Eggs from the old-fashioned hen had a better yolk colour and albumen texture. However, the taste and the shell quality were poorer compared to the modern egg layer."
This is really interesting. I think most here would agree that what you feed the hen has a lot of influence on the flavor of the egg and the color of the yolk. But a difference in flavor because of the breed? There are a lot of us here who keep many breeds and varieties of birds. I can't say I ever noticed a difference in flavor from one breed to the next - not even between high production sex-links and low producing dual-purpose. Differences in shell quality, sure, but not flavor. Not if they all received the same feed and the same management I can't.