Isn't it just! I used to keep hens (stopped when my neighbours got worried about avian flu; at the time there was TV footage of hens being put into big plastic bags and smothered, and I didn't want this for my beloved pets, and didn't want the flu for my neighbours). The eggs from my pampered girls tasted quite different from what I get at the supermarket, and I knew what went into them. Once or twice my hens got sick and I had to give them medicine, and the vet told me not to eat the eggs for a fortnight or so. I doubt very much that commercial egg-sellers are very conscientious about this.