Okay I think I understand it.
The sex links you get from hatcheries have been selected for and bred for prolific egg production and therefore have early burn out? But my homemade sex links will be just normal hybrids that have hybrid vigor with the sex link but with normal egg production so...
I asked a question in the general forum about production reds burning out their egg laying in 2 years. The consensus is yes, production strains do burn out and quit laying quicker than heritage birds. Some people also mentioned this happening to sex-link hens.
Below is the question I had about...