"Omega 3 enhanced eggs are from hens fed a diet flax seed or fish oils. Omega 3 enhanced eggs contain more omega 3 fatty acids and Vitamin E than the regular eggs. An independent test conducted by the CBC's TV show Marketplace found that omega-3 enhanced eggs contain approximately 7 times more omega 3 fatty acids than regular white eggs."
I have a 40 pound bag of flax seed that I mix in with the horses' feed. I try to give it to the chickens, but they really don't seem to like it. (Maybe they just get too many goodies- sunflower seeds, corn for warmth, crimped oats, spaghetti...).