The global transition from battery cages to furnished cages and cage-free systems for laying hens involves complex welfare tradeoffs that evidence-based analysis can help consumers and policymakers navigate.
The furnished cage vs cage-free debate illustrates the complexity of welfare assessment. Battery cages caused severe welfare harm by preventing all natural behaviours in extreme confinement, and their phaseout represents genuine progress. Furnished cages provide marginally more space and some behavioural opportunities, but 750 cm² — smaller than an A4 sheet of paper — still prevents natural movement and limits behaviour expression severely. Cage-free systems offer significant behavioural freedom improvements: hens can walk, run, flap wings, dustbathe and express social behaviours. However, cage-free systems are not unambiguously better: higher stocking densities within barns can cause intense competition for resources, and the inability to escape aggressive individuals leads to feather pecking and injury. Keel bone fractures from perch collisions remain a major welfare concern across all systems. The most welfare-positive systems combine outdoor access, lower stocking densities, slower-maturing breeds and good stockmanship — organic with dedicated pasture access offers the best outcomes for motivated producers.