Hens need to reboot

[Mother Hen 4]

I acquired 4 Isa browns who began laying regularly 3 years ago in September 2016. We used natural and artificial light year round, but they still took regular 3-4 week breaks from laying at almost every season change. However, this year, they quit laying in March and have never started back up. Also, 2 of them dropped dead within 3 days of each other of completely unknown cause about a month ago. The 2 that remain are healthy, active and lovely to be around. Just no eggs. Thoughts? Are they old/done? Traumatized? They are getting fed, watered and tended daily; no mites, molting or predator theft.

 

[sourland]

High production birds pushed for maximum egg laying are generally 'done' by the age of 3. The two that died suddenly may have done so because of reproductive tract problems. I think it's time to add some new pullets to your flock.

 

[aart]

How many hours of light a day do they get?