Get Answers to Bird Care Questions. Ask a Bird Specialist.
You're speaking to Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply. Please be patient. This may take a few minutes.
I'm sorry that your question wasn't answered in a timely manner. We don't have many avian vets on this site. It's not unusual for a backyard flock to stop laying or, at least, lay less eggs as the days shorten. There are also numerous causes of reduced egg production including infectious (infectious bronchitis, Mycoplasma gallisepticum, egg drop syndrome (adenovirus), paramyxovirus, and avian influenza), nutritional (water deprivation, inadequate calcium, phosphorus, sodium, protein, or vitamin intake), and environmental (declining day length as mentioned above, excessive heat, excessive cold).
You mentioned diarrhea which would be a clue that an infectious problem exists. Are there other worrisome symptoms?