I have a six month old mottle D'uccle hen who started laying about a month ago. In the past couple of weeks her feathers have begun curling all over her back. She's on layer pellets and scratch grains. My other D'uccle is starting to have her feathers curl slightly too. They are also penned with a Silkie hen who looks completely normal. Is this a vitamin deficiency? Could they have some frizzle genes? Are they molting?