I don't get it . I bought 3 sex links and 3 Buff orpington as chicks . They have no given me a single egg . Everything seems fine . They get plenty of food and oyster shell . In the past I have raised several flocks with no problems . I'm frustrated to say the least . It's winter in New Hampshire so I have the light on in the coop constantly thinking maybe they fell behind due to lack of daylight . In the past I have had eggs by 18-22 weeks . Any ideas ?