Roosters are starting to get white spots on tail feathers

[annieroo]

I started using DE last summer and have noticed over the winter that 3 of my Roosters have white spots or discoloration on some of their tail feathers. Could this be from the DE or does anyone know why this would happen. I would say the spots are about as big around as a quarter in sections.

 

[Miss Lydia]

I have never dusted my chickens with DE although I do use it in the coops and oin their feed, but if you can post a picture it might help us help you better.

 

[annieroo]

I haven't dusted the chickens either, just their coops. I've heard that it's not so great that Roosters eat layer feed which is meant for the hens, but I don't see how I could separate them from eating the layer. I'm just baffled. I can try and post pictures this weekend I won't be going home tonight due to work.
Thanks!