Help! Chickens have stopped laying eggs

[scinocco]

We need some advice, I have 3 hens in one coop that have stopped laying eggs all together. They all sort of stopped at the same time and it has been 2 weeks. The leghorns are about 1.5 to 2 years old, but my maran is only 1 year old. We are not having any cold temps or anything like that. The only other detail is that we have recently got 4 12 week old buff rocks, but the 3 older birds are separated from the younger birds and have not had any contact. Please help! We miss our eggs

 

[sumi]

Here are some of the most common causes for non-egg laying:

https://www.backyardchickens.com/a/chicken-behaviours-and-egg-laying-why-are-my-hens-not-laying

Hope that helps!