I am sure you are not hurting your flock by letting them free range and forage. Whatever the fauna and flora that grows in your area, it will have nutrients that they can use, and their instincts will tell them what they need and in what quantities. Trust them to know what's good for them, especially if you feel you don't know it.All I was trying to find out is if I'm harming my flock inadvertently by letting them forage, since many, many folks report that not feeding solely balanced commercial feed is contributing to the problems and losses my flock is experiencing. I don't even care about egg production at the moment. I just want my chickens and ducks to stop dying.