7 C.F.R. § 1280.233
(a) Required referendum. For the purpose of ascertaining whether the persons subject to this part favor the continuation, suspension, or termination of this part, the Secretary shall conduct a referendum among persons subject to assessments under § 1280.217, § 1280.218, and § 1280.219 who, during a representative period determined by the Secretary, have engaged in the production, feeding, handling, or slaughter of lamb; or the exportation of lamb.
(b) Subsequent referenda. The Secretary shall conduct a subsequent referendum:
(e) Manner of conducting referenda. A referendum conducted under this section with respect to this part shall be conducted in the manner determined by the Secretary to be appropriate.