It is hereby recognized and declared that indemnification for the destruction of swine infected with, exposed to, or suspected of being affected or exposed to hog cholera, is an expression of the public policy of this state to be employed only in the final phase of the official state-federal eradication program in the state, or as a means of preventing or minimizing its recurrence, as such may be determined by the board. Neither the board nor the state veterinarian may institute an initial program of indemnification until the state has been approved as meeting the requirements specified by the appropriate cooperating federal agency.