When the appraised cattle have been slaughtered and the amount of salvage ascertained, a report, on forms furnished by the State Veterinarian, in triplicate shall be made, signed by the owner and the United States Bureau of Animal Industry or State inspector and the appraisers by which the animals were appraised and destroyed, showing the difference between the appraised value and salvage. Two copies are to be attached to the voucher in which compensation is claimed, and one copy to be furnished by the owner of cattle. (1919, c. 62, s. 6; C.S., s. 4887.)