Egg laying is controlled by hormones manufactured by the pituitary gland, this gland needs at least 14 hours of daylight to release hormones. If daylight was receding around the time they reached p.o.l, they won't lay until the days are longer.I am wondering the same thing! I have three new ones from April.. my EE started laying(although very late as well) but the other two have yet to lay! They are almost nine months!! I have never had this issueI usually get eggs during the winter with my spring chicks. So I am stumped as to why these two have not started yet! They are Prairie Bluebell Eggers.