Feather leakage as well as mulberry in the comb can show at any age. An all black feathered bird at six weeks may still turn out to be a cull at five months due to feather leakage, mulberry comb, or other reasons. Culling is an ongoing continuous process throughout the life of the bird. I have a mature rooster that will be "culled" this fall because his legs are shorter than I like. I may have a potential buyer for him already, but if that doesn't work out, he will be put on the market for $1,000.
very nice bird for sure...out of all of the cemani i have got...i culled them all...they were from gff...and now i got four more...hope those are better...they seem to be weaker compared to other chickens....most chickens will pick on them to the point you have to go and save them and separate them...the females are so much smaller in all of the fibro breeds i have acquired...i do have a great all black svart hona which i will use in the breeding program...all the others had leakage in some way....silver feathers by the comb or in the back...or purple comb/wattles...its either yes breeder or no...about that simple...until i can get that breeder male looks like i wont be breeding this bird.