Iowa Admin. Code r. 21-64.206
Veterinarians may be called upon to officially identify animals and may be issued official identification for the animals in the form of the serial number ear tags for carrying out this duty. The veterinarian may apply the ID only if the flock-of-origin information is available. Sexually intact animals that require official identification and are of unknown origin shall not be used for breeding and must be restricted until slaughter When animals are identified, the veterinarian applying the ID must record the serial tag number applied to each animal and the following information (this requirement may be acCornplished by collecting a Cornpleted owner/seller statement form): the flock-of-origin ID number or name and address of the current owner, if different from the owner of the flock of origin, and the name and address of the buyer, if a change of ownership is occurring. The flock of birth should also be recorded, if known. These records must be kept for five years and made available for inspection upon request.
Iowa Admin. Code r. 21-64.206