@Tookie For myself I want to think that broody breeds live longer because their body gets a rest from egg-laying during that time. For some reason broodies get so focused on broodiness they don't have much appetite. So, we concentrate on breaking broodies and feeding and watering them to replenish their body nutrients. Some hens are hard broodies and take longer to break while others are not focused and lose the habit in 3 or 4 days. Our Doms from Privett Hatchery were never broody but our Silkies are determined broodies. Some personalities were easy to break while others took longer.
Even though our Doms never went broody two of them were laying during extreme heatwaves in summer so we lost one to heatstroke at one-year-old and her sister to heatstroke during egg-laying at two-years-old.
The Dom sister we have remaining was never a good egg-layer and here she is at 6-yrs-old. She layed about a 1/2 dozen eggs this Spring and quit. Hence I've attributed long-lifespan to less egg-laying. And for some reason she never layed eggs during hot summer months -- only during the cooler Spring months. Probably a fluke conclusion on my part about prolific egg-layers but that's how it turned out for me.
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