by spreading lipids, equivalent to 1-2 months' accumulation, on birds' feathers. Moreover, removal of the oil gland in chicks, which eliminated the main source of lipids, had no effect on subsequent dust bathing. It therefore seems that the main effects of deprivation of dust bathing in hens act through a central mechanism and not a peripheral one.

External factors

Environmental temperature is an important external factor; the frequency of dust bathing is greater at 22 C than at 10 C. Addition of supplementary visible

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