I have raised chickens going on 6 years now. We don't free range them, but they do have a 1900 sq ft run with shade and sunshine. They've long since destroyed the grass/weeds in it and eaten the bugs. I'm not bragging here, but our eggs are super delicious and far superior to store bought eggs. Most of you know that is true because you raise chickens yourself. However I observed something very interesting last summer. I know a man in another state who has a really large flock of layers. He lets them free range all over his property. Shade, large trees, scrub brush, tall weeds. His flock gets the run of his 20 acre home site, no restrictions. The interesting thing is that their eggs don't taste nearly as good as ours do. Our daughter told us that and sure enough, one time we visited him and he gave us a dozen and they didn't taste as good as ours do. I thought about that and came to the conclusion that was due to stress. Their coop is miserably dark and stinky. I mean stinky stinking like reeking to high heaven stinky. The design is all wrong what with corrugated steel for poop boards and nearly no light and way, way too little ventilation. No way can he clean those corrugated steel poop boards. A good dropping board will be 2 ft deep X the length of the roost and a foot beyond, with the roost dead center over the thing, a foot from the wall. And it will be smooth, like a recycled Formica kitchen counter top. Our coop is one that you can walk into at any time and all you will smell is dried (or fresh) grass clippings. Exception to that is daybreak when I let them out and scrape their poop boards to remove droppings. This is a daily ritual that takes me all of 3 minutes to do whether I have 24 of them or only 10 like now. (I just scrape all of it into a large plastic tote tub and snap the lid shut and slide it back under the poop board. Once a week it goes to the garden or around the base of some of our shrubbery.) On our coop I have four large windows that are open nearly year around and a turbine vent on the roof and full length soffit vents fore and aft. A coop has to breathe to be a healthy place for a flock. Anyway, I think that his birds are stressed by the miserable conditions of their coop and that is why they don't produce better tasting eggs than they do. Just a theory, but he does use the same feed brand that I do so what else could it be? Predators: He has lost countless chooks to predators ranging from owls and hawks to weasels. The weasels were coming in after dark and killing them in their coop. When I visited him he asked me what was getting them and after a walk around the coop I told him weasels being as there is no protection against them and the door from the feed storing part to the coop is left open for ventilation overnight. His fencing would keep out a bull, but not a weasel or snake. So it could be stress from the semi-nightly raids by weasels that have done it. But his eggs didn't taste nearly as good as ours the last time I tried them, so I am betting that stress plays a big part in why some eggs taste better than others.