Here is my problem with by-products in cat food:
http://cats.about.com/od/catfoodglos...meatbyprod.htm
http://cats.about.com/od/catfoodglos...meatbyprod.htm
If it was only organs/bone/etc. I would have no problem with them in my cats' food.What AAFCO doesn't mention is that meat byproducts may also legally contain: "4D animals (dead, dying, diseased, down), road kill, euthanized cats and dogs, including their collars. These source products are rendered, the fat is siphoned off to be used as "animal fat," and the remaining material is extruded to form "meat by-product meal."