Is it lower incubator temp for more pullets?

[suebgbr]

I am sure I read on here that if you want more pullet to roo ratio you have your incubator at a few degrees lower for the first 2 or 3 days.
Can anyone confirm that or was it a wishful dream?

 

[brahmabreeder]

Never heard of that. I have heard although that ACV will help improve the female to male ration. Not sure how true it is but I'm doing because I figured it can't hurt to try.