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Feather - Anatomy & Physiology (view source)
Revision as of 15:48, 1 August 2008
, 15:48, 1 August 2008→Moult
'''Fret marks''' (stress lines) appear as clear breaks in the feather colour as a result of interruption in feather growth and malformation of the feather barbs. Nutritional, environmental, disease or drug stresses can result in the production of 'fret marks'.
'''Fret marks''' (stress lines) appear as clear breaks in the feather colour as a result of interruption in feather growth and malformation of the feather barbs. Nutritional, environmental, disease or drug stresses can result in the production of 'fret marks'.
==Links==
http://en.wikipedia.org/wiki/Feathers