Buff orpingtons feathers look bad
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Hi! To rule some things out, do you have a roo? They can do a number on a gal's feathers. Have you checked her skin closely for lice or mites?
Chickens typically don't molt until 16-18 months of age. It could have been the roo. I'd check very closely for parasites. Here is a link that might be helpful. http://anrcatalog.ucanr.edu/pdf/8162.pdf
If it is stress, adding a little protein or "feather fixer" may help. Some of those contain a pesticide for mites as well, so read the label to be sure what you are getting.
Apparently, some brands claim to contain a preventative not a feed through treatment. I can't imagine a feed with pesticides in it for chickens though. Mites usually attack the vent area. Have a look at lice and mites, you might just have a stressed bird. sure, poor nutrition could cause it. Scratch is very low protein. I personally wouldn't mix it. It's meant as a treat to encourage "scratching" and shouldn't be fed without grit (or tiny rocks and pebbles) to grind up the corn. You could toss some alfalfa hay, that is high protein and has some calcium too. The greens make for a beautiful yolk color. Meal worms are good but $$$.