3 Must-Know Cage-Free Aviary Systems

Driven by the global shift toward cage-free and welfare-focused poultry farming, aviary systems are currently very popular and gaining traction quickly. Unlike battery cage systems, aviary systems allow birds to move freely, perch, nest, and sand bath. This makes them the preferred choice for farmers transitioning to cage-free or free-range farming to meet new regulations and consumer demand for ethically sourced eggs. At present, there are three dominant aviary system designs: American style, European style, and Chinese style. Next, we will provide a detailed introduction and comparison of the three cage-free aviary systems.

The aviary system is a modern poultry housing system designed to balance animal welfare, farming efficiency, and egg quality. It replaces traditional battery cages with a multi-tier steel structure, providing poultry, especially laying hens, with an environment that allows free movement, perching, and egg laying. Currently, the most popular aviary systems on the market include American-style aviary systems, European-style aviary systems, and Chinese-style aviary systems.

The American-style aviary system is a layer farming system centered on the concept of high-density cage-free housing. Originating in North America, it complies with local farming standards and has developed rapidly, especially in the United States and Canadian markets. It places emphasis on natural behavior, spacious living areas, automated management, and modular design, while balancing animal welfare and farming efficiency.

The American-style aviary system is mainly composed of multi-tier steel structures, perches, nest boxes, and a central egg collection belt. It is typically 2-4 tiers, with inclined ladders connecting each tier. It makes full use of the vertical space in the poultry house, allowing a stocking density of up to 9 birds/m². In addition, it can be integrated with automatic feeding systems, drinking systems, manure removal systems, egg collection systems, lighting systems, ventilation systems, and egg grading systems.

The European-style aviary system is currently the most technologically advanced and widely used system in global cage-free layer farming. Originating in Europe, especially Switzerland and the Netherlands, it complies with European farming standards and is designed to provide laying hens with an environment that both satisfies their natural behavioral needs and supports efficient, large-scale breeding. It is mainly used in high-end markets such as the European Union and North America.

The European-style aviary system is mainly composed of multi-tier steel structures, perches, nest boxes, drinking lines, feed lines, and a central egg collection belt. It is typically 2-4 tiers, with inclined ladders connecting each tier. It distributes hens’ activities, such as movement, feeding, drinking, egg laying, and resting, across different vertical spaces, thereby maximizing the use of poultry house space and achieving a stocking density of up to 9 birds/m².

A standard European-style aviary system is usually divided into three main areas, each designed to accommodate different behavioral habits of laying hens. For example, hens naturally prefer to perch at higher positions during the night and lay eggs in secluded areas. By placing different facilities, such as drinking lines, feeding lines, and nest boxes, on each tier and adjusting environmental factors, hens can be guided to perform specific behaviors in designated areas, greatly reducing the need for manual intervention.

The Chinese-style aviary system is a cage-free layer farming system that has been widely adopted in China in recent years. Developed based on the European-style aviary system, it is well-suited for poultry farming projects where land resources are limited, management intensity is high, and strong investment returns are required. Its core objective is to increase stocking density and automation while minimizing the complexity and investment cost of the aviary system.

The Chinese-style aviary system is mainly composed of multi-tier steel structures, perches, nest boxes, drinking lines, feed lines, and a side egg collection belt. It is typically 2-8 tiers, with inclined ladders connecting each tier. It features more tiers and a higher stocking density, reaching up to 12 birds/m². A single poultry house can accommodate 80,000 birds. Each tier of the structure is equipped with automatically opening and closing mesh doors, making it convenient to transfer hens in groups. In addition, the Chinese-style aviary system incorporates horizontal passageways and partitioned platforms to guide hens’ movement paths rather than allowing completely unrestricted movement. Like the two aviary systems mentioned above, it can also be integrated with multiple automated control systems.