on arrival at the slaughterhouse these pigs shall be kept and slaughtered separately from other pigs,- during ante and post - mortem inspection carried out at the designated slaughterhouse , the competent authority shall take into account any signs relating to the presence of classical swine fever,- the fresh meat from these pigs shall be either processed or marked with the special stamp referred to in Article 5a of Council Directive 72/461 / EEC(14 ) and subsequently treated in accordance with the rules laid down in Article 4(1 ) of Council Directive 80/215 / EEC(15 )