The competent authority shall ensure that the removal or spreading of used litter, manure or slurry from holdings in protection zones are prohibited, unless authorised by it. However, the movement of manure or slurry may be authorised from holdings under biosecurity measures to a designated plant for treatment or for intermediate storage for subsequent treatment to destroy the possible presence of avian influenza viruses in accordance with Regulation (EC) No 1774/2002 or with specific rules which may be adopted in accordance with the procedure referred to in Article 64(2).