| Conventional battery cage | Small, enclosed groups with limited floor area and little opportunity for movement. Space allowances depend on local rules. | Rows of wire cages, usually with shared feed and water lines and automated egg collection. | Compact footprint; eggs are easy to collect; routine feeding and manure handling can be automated. | Restricts behaviors such as nesting, perching, and dust bathing. Market acceptance and legal availability are limited in some regions. | Consider only where lawful and appropriate for the buyer’s market. Check current local law, retailer requirements, and planned facility lifespan. | Conventional cages have been prohibited in the European Union since 2012. Rules differ elsewhere; verify requirements for the installation location. |
| Enriched colony cage | Groups of hens share a larger cage furnished with additional resources. In the EU, the minimum is 750 cm² of cage area per hen, including at least 600 cm² of usable area. | Typically includes a nest area, litter for pecking and scratching, perches, and a claw-shortening device. | Provides more space and behavioral resources than a conventional cage; can retain some benefits of organized, automated production. | Still confines hens and does not provide the same movement opportunities as cage-free housing. Equipment and installation costs vary. | Compare usable floor area, group size, nest access, perch length, litter provision, ventilation, and compatibility with egg-handling equipment. | EU requirements also include at least 15 cm of perch per hen and access to a nest and litter. Confirm all current local standards before purchase. |
| Cage-free floor or barn system | Hens move freely within an indoor house, generally on a litter-covered floor. Stocking limits depend on the applicable standard. | Floor-level feeding and watering, litter, nests, and perches; the exact layout varies by system. | Allows walking and access to litter and nests; can suit markets that require cage-free eggs. | Requires careful litter, air-quality, and flock management. Eggs laid outside nest boxes can increase floor-egg collection work. | Assess usable floor area, nest capacity, litter depth and condition, manure handling, lighting, ventilation, and the labor needed to manage floor eggs. | “Cage-free” requirements are not identical across jurisdictions or certification programs. Confirm the definition and any stocking-density limit that applies. |
| Multi-tier aviary system | Indoor cage-free housing with elevated tiers that add usable space above the floor. The permitted density and measurement method vary by standard. | Platforms or perches, nest areas, feed and water lines, and ramps or other routes between levels. | Uses vertical space and gives hens more room to move, perch, and access different areas of the house. | Higher installation complexity; tier layout and bird movement need to be managed to limit crowding, injuries, and uneven use of space. | Compare tier arrangement, ramp access, usable-area calculations, inspection access, manure-belt design, and maintenance requirements. | Check local rules for usable-area calculations, perches, nests, flock size, and any required outdoor access or certification. |
| Free-range system | Indoor cage-free housing with hens also given access to an outdoor area when conditions and management allow. | Combines indoor nests, litter, and perches with pop holes and an outdoor range. | Provides outdoor access and can support additional natural behaviors; may meet specific market or certification requirements. | Needs suitable land, secure fencing, and range management. Weather, predators, disease control, and outdoor-use patterns require attention. | Evaluate range size and drainage, pop-hole capacity, fencing, shelter, biosecurity, and how outdoor access will be managed year-round. | Outdoor-access definitions, minimum areas, and certification criteria vary. Do not assume that “free-range” has one universal standard. |