I have absolutely no proof beyond my own experiences, but I have often wondered, if the heat inside my coop, could trigger some sort of hormonal response in my flock. Because if I can keep it cooler, I don't have as many broody ladies. But if I let it get too warm, its like they all want to go broody within a few days. I know this could totally be coincidental, but it's happened enough over the years to make me wonder.I’m setting here with the wife discussing how we have yet another broody bird. We culled 3 broody birds last year and kept our ol faithful barred rock. Of those three we culled two were 8 month old RSL from my RIR/Barred Rock stock, the other was a tractor supply RIR.
This year the pullet that’s broody was born Aug 1 of last year.
That’s 3 broody girls 8-10 months old within the last couple years.
So is environment a factor?? I seem to be a broody magnet.