Golden, 2012 – A comparative examination of rearing parameters and layer production performance for brown egg-type pullets grown for either free-range or cage production. Resource
South Korea – 1. Animal welfare laying hen farm certification standards (Article 5) – 동물복지 산란계농장 인증기준(제5조) Resource
Cordiner, 2001 – Use of perches and nestboxes by laying hens in relation to social status, based on examination of consistency of ranking orders and frequency of interaction Resource
Cotter, 2015 – An examination of the utility of heterophil-lymphocyte ratios in assessing stress of caged hens Resource