Our experiment showed that laying hens discriminated
between uncoated and coated feathers. All treatments
decreased palatability of feathers due to a lower number
of feathers plucked and eaten. However, we found clear
differences in the effectiveness of treatments. Quinine concentrations
of 2% and 4% were most effective in lowering
the number of feathers plucked and eaten compared to
other quinine concentrations and treatments.