I have some silkies that are around 25 weeks old and started laying about a month ago. I have been randomly testing their eggs for fertility and so far - zippo. They are definately being mated by my showgirl roo and his fertility has been "proven" with my other hens. Is it just their poofy butts that are getting in the way? Or could it be that they are young layers? I was surprised they had already started laying since I heard that silkies were late bloomers.