Article 3 imposes an obligation to register holdings where pigs are kept, whereas article 4 provides for identification by approved ear-tag which bears the pig herd registration number of the holding attached to its left ear, and for movement of pigs from a holding. A person who has been granted registration in respect of more than one holding may move a pig between his or her holdings, if: (a) the pig is marked in accordance with article 4 no pig (other than a breeding pig) purchased from a third party is or has been present on either holding. Article 10 specifies the procedure for approval of manufacture and supply of approved ear-tags. A person shall not move a pig or cause or permit a person to move a pig from a holding unless he or she maintains a chronological record in writing in respect of each movement of those pigs in accordance with article 11. Movement of pigs shall be notified to the Minister in accordance with article 13. Article 16 imposes duties on the owner or person in charge of a slaughterhouse in respect of the acceptance of pigs.