Has anyone tried storing hatching eggs at 40° for more females?

[Bantu]

I read this article
http://www.fresheggsdaily.com/2016/04/the-secret-to-hatching-hens-not-roosters.html?m=1
and I was wondering if it might work. I'm sure you would have to set twice as many eggs though. It's so hard to cull little roos and no one wants them.

 

[red horse ranch]

It's an interesting article. I have never tried it but sometimes when I'm collecting hatching eggs in the winter the eggs are pretty cold when I bring them in. I have tried lowering the incubator temperature for the first few days to see if I get more females. But I couldn't see where it made a difference. What I have noticed is that in the winter and early spring I get more males but in the summer I have a higher percentage of females. And I have noticed that some of my hens will only produce males where some hens have mostly female chicks.

I've been hatching for years and I still haven't figured out a way to get more girls. So I buy a lot of females at the feed store.

 

[aart]

I'll call click bait on FED.

I think if it were true, the hatcheries would have caught on long ago.

The article/study they cited was published in 1960,
no numbers of eggs in the study were given,
and.....
"However, storage at 40°F produced significantly more pullets than cockerels, 54.6 per cent. of the chickens being pullets."
......4.6% is not 'significant' in my book, but within the normal range of gender ratio.