An aviary apparatus for rearing laying hens, which comprises mutually laterally adjacent multistory rearing batteries, each one of the batteries comprising at least one lower stop surface and one upper stop surface, with areas on which the poultry can walk between the batteries and laterally to the outermost batteries. The lower stop surfaces and upper stop surfaces comprise corresponding conveyor belts for eggs and feces, the walkable areas comprising inclined floors which are arranged descending toward a contiguous conveyor belt of a lower stop surface of a corresponding battery.