Hens can stop laying for a variety of reasons....molting, environmental changes, unbalanced diet, parasites or disease...so that being said, you need to start by telling us what your hens eat (beieve it or not I ran into someone on here who fed nothing but cracked corn and couldn't figure out why her hens' laying habits were so poor) Make sure they are getting free choice calcium or layer feed and plenty of fresh clean water. Are they molting? (A.K.A there are a crapton more feathers floating around than usual and the hens look partially bald) Most first year hens don't molt, but my Americauna is right now and she's about the same age. Have you moved or moved them recently? And lastly be sure to check for signs of parasites. Grab one of your birds and sit down with her, she won't struggle so much if you turn her on her back, and then pull her feathers apart so you can see her skin and examine her for mites or lice. Pay attention to poo...it's gross but if your hens have worms that are not controlled it can affect their laying. Lastly, be mindful in observing their behavior....are they doing anything that is abnormal? Lethargic? Not eating well? I hope this gives you a good start, there are probably more threads on here about others' hens not laying that may also be helpful. Good luck!
