cap_118,
How long have you been feeding the wheat?
You could have a case of Vomitoxin, seems the 2009 wheat crop had just about ideal conditions for the fungus that produces it. There were major fungal issues with a number of crops. I experienced what amounted to a total wipe out of tomatoes by late blight (as well as some folks lost their spuds), the wild blueberry barrens were hit with another fungus that causes leaf drop, those fields won't produce any next year, and last a number of tree species also got blasted with fungal infections, most of them will survive provided we don't get a multi-year stretch of the same conditions.
You need your feed checked.