I have a flock of 8 hens who haven't been laying. I know that one of them is still a pullet (appx. 5 1/2 months) and the rest are 14 months and should be laying fine. They were laying fine until a couple weeks ago. I have been getting about 1-2 eggs per day now. I am feeding them egg layer and they are supposed be some of the best layers. Is something wrong? I have also heard that yogurt helps them get back into laying cycle. Does it truly work?