# Welfare of Farmed Animals Regulations (Northern Ireland) 2012, Paragraph 2


All systems shall be equipped in such a way that all laying hens have—
(a) linear feeders providing at least 10 cm per hen or circular feeders providing at least 4 cm per hen;
(b) either continuous drinking troughs providing 2.5 cm per hen or circular drinking troughs providing 1 cm per hen;
(c) at least one nest for every seven hens. If group nests are used, there shall be at least 1 m2 of nest space for a maximum of 120 hens;
(d) perches, without sharp edges and providing at least 15 cm per hen, which shall not be mounted above the litter, and the horizontal distance between perches shall be at least 30 cm and the horizontal distance between the perch and the wall shall be at least 20 cm; and
(e) at least 250 cm2 of littered area per hen, the litter occupying at least one third of the ground surface.

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Source: https://www.legislation.gov.uk/nidsr/2012/9780337986475/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-welfare-of-farmed-animals-regulations-northern-ireland-2012/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.