Sporadic feather loss
Hello, In my flock of cockatiels (I have 19), there seems to be a feather disease that only a few (3 or so) birds exhibit. It's spordic feather loss that occurs after they've matured. There are three family lines in the flock and only one family line exhibits this problem with ONE exception of a lutino bird in the first family line who had great feather loss around her head and neck.
The albino father of the third and youngest family line has some feather loss around his neck and ears, and he is store-bought from PetSmart. All the birds who exhibit feather loss to this degree are albino, but not all the albino birds have the same problem. In the pictures attached, only within the last few weeks has this bird's feathers been particularly sparse in the tail and wing areas. The bird is only two years old and even looks disheveled around the legs. Note that yellow bump in the center of the first picture.
It is not a plucking problem because my birds do not pluck each other. Is this a cause of stress, lack of some nutrient, or just a genetic disease? They are on a seed diet but I give them vegetables and other grain foods daily. Also, I do not have the money to take my birds to an avian vet.
Any insight is much appreciated.