I seem to get more males during the colder season and more females during the warmer.
I've read it may have something to do with the day light hours, or even artificial lighting.
I can't remember what the rule is though, more light more females or males?
And I'm not sure how accurate it is. My chins are getting much less lighting over the last 4-5 months and I haven't noticed a difference.
Wish it would work with people
Planning pregnancies would be a lot more fun.