As used in this chapter, unless the context otherwise requires:
1. “Livestock” means an animal belonging to the bovine, caprine, equine, ovine, or porcine species, ostriches, rheas, emus, poultry, or fish or shellfish.
2. “Veterinarian” means a person who practices veterinary medicine under a valid license or temporary permit as provided in chapter 169.
3. “Veterinarian’s lien” or “lien” means a veterinarian’s lien created under section 581.2A.