It is what you feed them, I have heard.
Yes, free-range chickens have eggs that are more nutritious, regardless of color..........
America’s Test Kitchen did bit on them. It’s on line someplace. Cuz there’s green blue, yellow eggs, too.
I’ve heard that egg color is determined by what they eat and where they live,
A couple of books say that “cage free” means they have 14 feet to walk around on but that can be inside huge barns with thousands of birds eating birdseed tossed on the floor. I NEVER buy eggs from those poor little birds. Yolks are pale.
PASTURE RAISED birds can live in a small house that gets moved around a certain number of acres. They may or may not have some grain inside but birds seem to prefer eating food from yummy protein sources like bugs and worms. On a long-ago thread here someone said he even saw his birds eating frogs and lizards. Eggs are a bit more expensive depending on where you get them. Trader Joe in my neighborhood sells their house brand Pasture-Raised for 5.99 and $6.99.
Natural Grocer charges a little more, and Safeway a little more than that. Last carton I bought was Wilcox Family Farms Pasture Raised. They are in WA state, not all that far from me. My friend knows the Wilcox family, says they are very contientious about their birds. When it snows, birds stay inside and they are not labeled Pasture Raised.
Every brand I’ve mentioned has BROWN EGGS