When animals, eggs, or materials have been destroyed pursuant to the requirements contained in this part, any claim for indemnity shall be presented on forms furnished by APHIS on which the owner of the animals, eggs, or materials shall certify that the animals, eggs, or materials covered thereby, are, or are not, subject to any mortgage as defined in this part. If the owner states there is a mortgage, forms furnished by APHIS shall be signed by the owner and by each person holding a mortgage on the animals, eggs, or materials, consenting to the payment of any indemnity allowed to the person specified thereon.