The plumage of hens housed singly in cages was generally in good condition after one year. There was slightly more feather loss where hens could peck their neighbours' plumage (adjacent cages) than where this was not possible (spaced cages). 2. It was concluded that most, though not all, of the feather damage seen in the individually-caged birds was due to abrasion, but that abrasion was likely to be relatively unimportant in multi-bird cages. 3. There were no significant differences in egg production or food intake associated with the two kinds of housing. 4. In the adjacent cages there was an increase in maintenance requirement related to increased feather damage, which amounted to about 7% for an increase of about one unit in feather-loss score. In the spaced cages the increase was less. 5. Hens with increased feather damage also showed increased egg production.
