I have never kept chickens past their 2nd year - they have
gone during that 2nd molt. The only exception was a 7 year-old Sebright that continued to a lay a few eggs but she was free-ranging all the time so I usually didnt know what she was up to
.
Now, however, I'm thinking I need to re-assess my long-held decisions on keeping older hens.
I've seen other studies like this: An analysis by of production layers by
University of California, Riverside (8 page, pdf) showed that:
1st laying cycle
Rate of lay during peak week 92%
Rate of lay @ 65 weeks of age 73%
2nd laying cycle
Rate of lay during peak week 84%
Rate of lay @ 105 weeks of age 68%
3rd laying cycle
Rate of lay during peak week 78%
Rate of lay @ 140 weeks of age 64%
As a BYC person, that doesn't look at all bad to me and I wouldn't be surprised if the rate of decline would stay about the same in later years of life
.
Steve