Definition eggs laid by hens that are stocked at a density of no more than 25 birds per square metre on the floor and the building has sufficient perching to allow a minimum of 15 cm of perching for every bird Reference "Warrington Borough Council > Advice & benefits > Trading standards > Guidance Notes > Free Range & Other Special Marketing Term Eggs, http://www.warrington.gov.uk/adviceandbenefits/Tradingstandards/guidance/Guidance_FFRE.aspx (14.5.2009)"
Definition eggs laid by hens that have continuous daytime access to open-air runs that are mainly covered with vegetation and have a maximum stocking density of 4 000 hens per hectare of ground available to the hens or one hen per 2.5 m2 Reference "Regulation (EEC) No 1274/91 introducing detailed rules for implementing Regulation (EEC) No 1907/90 on certain marketing standards for eggs CELEX:31991R1274/EN"
Definition eggs laid by hens reared in cages Reference "COM EN based on:Regulation (EC) No 589/2008 laying down detailed rules for implementing Regulation (EC) No 1234/2007 as regards marketing standards for eggs CELEX:32008R0589/EN"