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I should say that what is in OPs picture are not stress bars as per see (bars are 'breaks' in the feathers, or in less major occurrences black (no pigment) bars) but they all fall under the feather development disruption category.Feather growth requires a myriad of nutrients for normal feather development. Therefore, if there is disruption in the assimilation of nutrients during the time of feather development, this will result in the production of stress bars on the feathers. Stress bars appear as black or depigmented lines that transect a feather, and multiple lines may occur at different levels on the feathers, if multiple bouts of disruption have occurred. If a young bird develops gastro-intestinal problems, digestive disturbances, prolonged chilling or periods when it is not fed (nor fed enough), this will result in the production of stress bars at the same level on all the feathers that were developing during that time.
Thanks for the links. I'm actually going to read these right now as my zon spent 28 years on a seed diet and lasagna and mashed potatoes. I knew from looking at him he had some nutritional issues including a little bump on the bottom of each foot indicating a vitamin A deficiency. He is almost completely converted to pellets right now and is actually looking forward to his veggies and fruit and other healthy foods. I am hoping in a couple of months to see a much more vibrant looking bird.
Hypothetically, he may be taking longer to grow the new feathers in as he doesn't have as many of the vitamins and minerals needed to make them in reserve as a healthier bird would? Growing feathers is a huge pull of the birds resources (fats minerials, what not), for example my conure has to grow tailfeathers the same height/length as his actual body (envision a bird without the feathers to get an idea of their actual body size). That would be very taxing on a creature that only weighs 120 grams! So given your past guys diet, maybe he's taking a little longer as he's not only trying to grow feathers, but to properly nourish the rest of his body at the same time?
I'm glad you have him, I bet he will come leaps and bounds with you in no time!