"Advantages include: Hens rarely get sick and have lower rates of mortality due to the controlled cage environment. It’s also easier for farmers to identify and treat sick hens as they are housed in smaller groups, Cage hens avoid injury from in-fighting within the flock as smaller groups of five or six per cage means the birds are able to establish a stable pecking order.
Disadvantages include: Hens in cage systems have reduced social interaction with other hens, Cage hens are unable to roam and explore as they are confined to a relatively small space, In most cage farms, the hens are unable to practice some natural behaviours like nesting and dust-bathing."