Member States shall ensure that from 1 January 2002 all newly built or rebuilt systems of production referred to in this chapter and all such systems of production brought into use for the first time comply at least with the requirements below. 1. All systems must be equipped in such a way that all laying hens have:
(a) either linear feeders providing at least 10 cm per bird or circular feeders providing at least 4 cm per bird;
(b) either continuous drinking troughs providing 2,5 cm per hen or circular drinking troughs providing 1 cm per hen.
