You must ensure that all livestock are tagged with a permanent identification device before the animal(s) move from your property.
Livestock are uniquely identified by a device known as a NILS tag. It can provide information on the property of origin, as well as a traceable record of where the animal has been. The device will contain the property identification code (PIC) and national livestock identification system (NLIS) number, which can identify an animal within the NLIS database.
Please note that only cattle, sheep, and goats are currently traced via the NLIS database. There are different devices and tagging requirements depending on the animal you are tagging.