For the last couple of weeks my hens have all stopped laying, I have 5 silkies and then a range of younger hens that are not old enough to lay yet, ,the silkies have always been pretty reliable layers apart from when they have been broody, but for the last 3 weeks no eggs at all, I have checked throughly for mites no signs, they all seem a good weight, and they don't seem ill or sick, I am at a complete loss as to why all of a sudden no eggs, also no signs of moulting and they have always had the same feed, any help would be gratefully received