7 U.S.C. § 399

For the purposes of all classification and administration of Acts of Congress, Executive orders, administrative orders, and regulations pertaining to— (a) fox, rabbit, mink, chinchilla, marten, fisher, muskrat, karakul and all other fur-bearing animals, raised in captivity for breeding or other useful purposes shall be deemed domestic animals; (b) such animals and the products thereof shall be deemed agricultural products; and (c) the breeding, raising, producing, or marketing of such animals or their products by the producer shall be deemed an agricultural pursuit.