Our group had a talk from a rep on horse feed last month. Their factory is next to a peanut processing plant and they have all the peanut hulls they want available for free. They don't use them because they have no nutritional value and they don't use fillers in there feed.They are not harmfull so if supose you could add them to you're feed just to add bulk. A side note, they make great stall beading and some stables use them in south GA where they can get them for the cost of haulling them off.
