I think it was about 7-8 weeks for full feathers coming in for my chicks. You can usually tell if the feathers cover all spots and the tail is feathered.
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May just be baby feathers. Only two of mine, at that age, lost theirs, but it was a mess for awhile.I love the question cause was going to ask my self . Interesting part for me is that only my three silver duck wing phoenix rooster the lost the feather on there backs there only 8 weeks and they are getting loads of protein all the otheres are fine though so i sorta found it interestinG and something to look in to . Any information is good thanks