out of my 22 5-week old chicks, 3 just don't seem to want to feather out. 2 of them are Brahma cockerels (i'm almost positive) and one is an EE pullet (again, almost positive). their wing feathers and some chest feathers have come in like all the rest, but they still have large patches of down where all the others have feathers. i had read that cockerels feathered slower, but this seems especially long. they really need to go out to the coop for good by next week, but i wanted to wait until they were almost completely feathered. i could have put them out the end of last week if it weren't for those three. is this normal? is there anything i can do to speed them along?