Stonyfield issued a statement concerning the use of GMO feed on animals that produce the dairy for their Organic Yogurt.
Truth be told, I've thought about this before and I was always curious if you could feed a cow nonorganic feed and still call the yogurt produced organic-- as long as you don't introduce anything nonorganic to the yogurt itself.
According to Stonyfield-- to be certified organic you MUST also use organic feed.
You can read their statement HERE
I love that they are willing to clarify this for their customers.