Manure of horses, cattle, sheep, other ruminants, and swine shall not be imported except upon permission from the Deputy Administrator, Veterinary Services. Importations permitted shall be subject to such restrictions as he may deem necessary in each instance: Provided, however, That manure produced by animals while in transit to the United States shall be subject only to the requirements of the Department regulations governing the importation of domestic livestock and other animals.
9 C.F.R. §95.31
Approved by the Office of Management and Budget under control number 0579-0015