 It does not apply to chickens or other birds.Meat from animals which are dead, diseased, disabled or dying (4-D meat) on the arrival at the slaughterhouse is often salvaged for rendering, and used by a wide range of industries including pet food manufacturers, zoos, greyhound kennels, and mink ranches.The U.S. Code (Title 21, Chapter 12, Subchapter II, § 644)  Regulates transactions, transportation, or importation of 4–D animals to prevent use as human food