Hi - I also have four ex battery farm chickens, and noticed over the last two days one of the 4 eggs that I get daily is turning white. It may be age, it may be the season as we are in the height of our summer! I didn't know their age when we go them. We will go back and get more, they bring us such delight and pleasure, with their own personalities. I must say my chickens are healthy and happy!. It is the first time I have had chickens, and have the space on our property to let them free range. Just watching and enjoying them, I am convinced that they are meant to roam and forage and not be in battery farm.