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I know that certain Mareks strains can stop egg production because of the amount of tumors in their organs. But that one would be hard to check unless you euthanized one or more and did a necropsy... This one might be an absolutely wild spin, but if you still wanted eggs you could get some...

Maybe this article will help you? Mareks definitely can make chickens stop laying, but it's not always the case. https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/ I think there are also some breeds of chickens, like the Egyptian Fayoumi, that are Mareks...