Wheat middlings consist of coarse and fine particles of wheat bran and fine particles of wheat shorts, wheat germ, wheat flour and offal from the "tail of the mill". Mill run is the state in which a material comes from the mill, ungraded and usually uninspected. (AAFCO, 2003) This ingredient is a fractionated, non-nutritious, by-product used as filler and is not recommended for pet food.