According to the system or systems adopted by the Member States, they shall ensure that the owners and holders of laying hens apply not only the relevant provisions of Directive 98/58/EC and of the Annex to this Directive but also the requirements specific to each of the systems referred to below, namely:
either the provisions laid down in Chapter I as regards alternative systems;
or the provisions laid down in Chapter II as regards unenriched cage systems;
or the provisions of Chapter III concerning enriched cages.