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Dustbathing behaviour of uropygial gland extirpated and intact White Leghorn hens was studied after 27 and 75 h of deprivation of dust. Thereafter the hens were given access to dust (litter) and latency and duration of their first dustbathing bout were recorded. A short latency and/or a long duration were taken to indicate a strong urge to perform dustbathing. Judged by either of these criteria the gland extirpated birds showed a higher dustbathing tendency than the intact birds and in both groups the dustbathing tendency increased from 27 to 75 h of deprivation. Because of these findings the present study failed to support the “lipid regulation theory”: that the amount of lipid in the plumage should regulate the dustbathing tendency. Rank in the social hierarchy significantly influenced latency and duration of dustbathing but there was no simple correlation. After two weeks with constant access to litter no differences in the amount of feather lipids could be found between gland-extirpated and intact birds.

Dustbathing Behaviour of Uropygial Gland Extirpated Domestic Hens