I have pullets, i think they're around 13 weeks, somewhere in there. Anyway i moved them a couple of weeks ago to their chicken coop and they started to lose feathers. I go in there and there is long feathers and the down ones too. I thought it was just stress from being moved but it's continued. They don't have any problems like pecking or anything to prove their stressed so i thought they might be going through a moult. How long does moulting last?