When I was a kid, I had a Sebright banty who lived to be 7 years old but I remember she was laying very few eggs during the last year of her life. (I made note of her passing in the family bible
.)
Rose, in Principles of Poultry Science, has a chart of information from a British study on egg production thru 3 cycles:
- During the first laying period, daily production thru the months was between about 95% and 80%.
- The second laying period had daily production between about 85% and 70%.
- The third, production was between about 80% and 55%.
I don't really know personally since, other than Goldy the Sebright, I never kept hens a 3rd year.
Currently, commercial outfits keep about 75% of their laying flocks into a 2nd laying cycle.
Department of Animal Sciences, UC, Riverside I can't understand the need to cull an entire backyard flock after only 1 year unless there was some concern about disease. They don't "run out of eggs" but there are other reasons hens may stop laying.
Commercial operations never allow their birds to get to a 3rd laying period. Their profit margins are too narrow. Hens, during their 3rd year, were laying about one-third less eggs than young pullets. And keep in mind, these were production layers in that British flock. I bet the hens were culled as they went along to eliminate, as best as could be determined, the birds that were not laying.
Steve