### Question
How is the term major species defined?


### Answer
The term **major species** is defined in *21 U.S.C. § 321* as the following:

> cattle, horses, swine, chickens, turkeys, dogs, and cats, except that the Secretary may add species to this definition by regulation

#### Citation:
  - *21 U.S.C. § 321*
  - Heading: **CHAPTER 9-FEDERAL FOOD, DRUG, AND COSMETIC ACT > SUBCHAPTER II-DEFINITIONS**

