The funds collected under this assessment shall be used to promote the interests of the pork industry and to conduct a porcine disease control program. The department shall remit all funds collected under this act to the association at least monthly. The association shall return to the department at least monthly those funds necessary to conduct a porcine disease control program. In order to prevent duplication of effort, these funds shall not be used for activities funded under 7 U.S.C. chapter 79, pork promotion, research and consumer information.