He is definitely molting. I believe that the coloration change in his case is not genetic at all, but it is due to sun exposure. I have a post elsewhere - where I show the difference in hackle feathers during molt of a bird in South Africa. Big difference. In APA SOP it does talk about whites getting 'brassy' in the sun..and it is hard to tell what is causing the yellowing but I think it is sun. In my 1938 APA SOP -- btw - it defines 'cream' in the technical descriptions as 'light yellow'. Subsequently they have added much more wording to the definition.Thanks. The hackles on your boy are very interesting also. It is amazing to see how our chickens change all the way even in adulthood. I do see now why some breeders wait until their birds are 2 years old to breed them. It makes very much sense to me now. Seeing how at 1 and 2 years of age they are still changing, I suppose we can not be 100% positive on some qualities that we are breeding forward or not if we breed to young.
I think you have already posted a pic of this male but could you post another? Is he molting or just changing color? Id love to also see him again once he finishes his color change(if/when he finishes).
Here is a picture from today--- I let them out of the pen and used long lens.....
can you see those long quills? ouch!
Here is something that for years I have been thinking - if the correct color for CREAM is the color of light butter -- he is loosing cream and getting in non-cream. The new growth doesn't resemble butter IMO.
Here is my female that I have posted molt tail pictures of -- It shows how short a growth time the pigmentin the darkest feathers was turned off to make the white bars.