Most of the eggs currently sold in supermarkets are nutritionally inferior to eggs produced by hens raised on pasture/grass. That’s the conclusion Mother Earth News found having completed a testing project in 2007. The test found that, compared to official U.S. Department of Agriculture (USDA) nutrient data for commercial eggs, eggs from hens raised on pasture/grass 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
These amazing results come from 14 flocks around the United States that range freely on pasture/grass or are housed in moveable pens that are rotated frequently to maximise access to fresh pasture/grass and the birds are protected from predators. We had six eggs from each of the 14 pastured flocks tested by an accredited laboratory in Portland, Ore.