An egg-testing project performed by Mother Earth News in 2007 found there were significant differences in nutrition between factory-farmed and organically raised eggs.
Compared to official U.S. Department of Agriculture (USDA) nutrient data for commercial eggs, eggs from hens raised on pasture may contain:
- 1/3 less cholesterol
- 1/4 less saturated fat
- 2/3 more vitamin A
- 2 times more omega-3 fatty acids
- 3 times more vitamin E
- 7 times more beta carotene
P.S. As a bonus there is a report and scorecard on organic dairies at the Cornucopia website. You can also subscribe to their email newsletter if you are so inclined.