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Most of the studies show no real nutritional differences (or very little). This is one of those things where the makeup of the egg is determined more by the genetics of the bird - the biggest difference tends to be in beta carotene levels, which are what makes yolks yellow, and makes people think eggs taste better (as shown in the experiment linked earlier)
That being said, there are still plenty of reasons to prefer free range birds (and I free range mine)
http://www.poultryscience.org/pr081511.asp?autotry=true&ULnotkn=true
It's not that diet doesn't matter, it's that conventional commercial chicken food is really well designed - and it is designed and tested by teams of nutritionists and biologists. Soy is not bad for chickens. Corn is good for chickens. Chickens don't give a crap which one of permethrin or pyrethrin you used to kill mites(one is synthetic, one is organic, but they're the same thing).I just can't get my head around the idea that diet doesn't matter at the output end. My birds eat really, really well, if my research and the label on their feed can be believed. No soy, all organic, nutritionally balanced... But that can be true at the grocery store too, at prices equal to mine by the dozen, give or take a buck. I'll never come close to those economies of scale.
Someone, quick, reassure me before I heat up a pot of scalding water and head out back with the hatchet.
I read those pages, and I don't find links to the studies themselves, only summaries to the tune that I've seen elsewhere. It's articles like those that confused me in the first place; credible enough and they pass the gut test, but where's the methodology and data.
It's not that diet doesn't matter, it's that conventional commercial chicken food is really well designed - and it is designed and tested by teams of nutritionists and biologists. Soy is not bad for chickens. Corn is good for chickens. Chickens don't give a crap which one of permethrin or pyrethrin you used to kill mites(one is synthetic, one is organic, but they're the same thing).
There's a lot of studies out there on the nutrition of organic vs conventional agriculture - long story short, there aren't any. Some of the conventional pesticides are worse than their organic equivalent (very few, because they use the the organic in that case), and many of the organics are worse than the conventional is. Organic doesn't mean safe. It doesn't mean healthy. It doesn't mean no pesticides. It doesn't mean more sustainable. It doesn't mean better for the bees or birds or fish.
It means you use 'natural' instead of synthetic. That's it. It's a philosophical thing. It's the agricultural equivalent of being Amish.