Has anyone ever come across this term? Feather Fret.
Google it, and images and you will find some pics.
In my quest for perfect feathers I have dipped, dusted and sprayed only to find some birds with these marks or lines on their feathers.
I believed it was depluming mite but I now realise marks and imperfections can be caused by stress, heat and nutrient deficiencies.
Any experiences or comments???