En undersökning gjord 2007 visade att ägg från frigående utehöns kan vara mycket mer näringsrika än industriägg som köps i affären. Enligt denna länk visar andra undersökningar samma sak (tryck på "denna" för att komma till sidan).
"Most of the eggs currently sold in supermarkets are nutritionally inferior to eggs produced by hens raised on pasture. That’s the conclusion we have reached following completion of the 2007 Mother Earth News egg testing project. Our testing has found that, 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 fatR
• 2/3 more vitamin A
• 2 times more omega-3 fatty acids
• 3 times more vitamin E
• 7 times more beta carotene"
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