http://www.legislation.gov.uk/ssi/2011/327/article/17/madeThe Pigs (Records, Identification and Movement) (Scotland) Order 2011Animal healthAnimalsenKing's Printer for Scotland2016-11-02ANIMALS;ANIMAL HEALTH This Order implements Council Directive 2008/71/EC on the identification and registration of pigs. 17 1 Subject to paragraph(2), no person may, unless authorised by the Scottish Ministers, replace an identification mark applied or attached under this Order. 2 A keeper must replace an identification mark if it has— a become illegible; b been removed for welfare reasons; or c been lost. 3 Any person replacing an identification mark must either— a apply an identical identification mark; or b apply a new identification mark and cross-refer the new identification mark with the original identification mark in the holding register.