I have my doubts about the process, especially when people say it works because it makes the eggs turn female, which of course isn't possible. But the hatcheries do get money for males, even if it's for dog food chick mush, so I'm not sure they'd 'waste' fertile eggs by purposely killing them. But that's just my thought.If it really worked don't you think the hatcheries would be doing it all the time. I've had a few incubations with lower temps and the only thing I could tell different was it took longer to hatch and had more weak chicks.