All substances and concentrations used in the present
study reduced plucking and consumption of coated feathers
relative to uncoated feathers. This result refers to the
ability of the bird to recognize sensory signals and to discriminate
between palatable and unpalatable feathers. Our
results are consistent with experiments where 1% garlic oil
coated food (Mason and Linz, 1997), 0.6 mol magnesium
chloride solution (Engelmann, 1934), bitter almond oil
odour (Roper and Marples, 1997), 2% (Skelhorn and Rowe,
2005) and 4% quinine coated food (Skelhorn and Rowe,
2006) deterred species from consumption. This finding
is remarkable. It may mean that the water-impermeable
feather did retain chemicals we used in the present experiment
on its surface, but, probably in a lower intensity as
when added to drinking water.
All substances and concentrations used in the presentstudy reduced plucking and consumption of coated feathersrelative to uncoated feathers. This result refers to theability of the bird to recognize sensory signals and to discriminatebetween palatable and unpalatable feathers. Ourresults are consistent with experiments where 1% garlic oilcoated food (Mason and Linz, 1997), 0.6 mol magnesiumchloride solution (Engelmann, 1934), bitter almond oilodour (Roper and Marples, 1997), 2% (Skelhorn and Rowe,2005) and 4% quinine coated food (Skelhorn and Rowe,2006) deterred species from consumption. This findingis remarkable. It may mean that the water-impermeablefeather did retain chemicals we used in the present experimenton its surface, but, probably in a lower intensity aswhen added to drinking water.
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