Is it true that a lower temp makes more girls?

Must work for you, Congrats!!

 

Well next time you set egg try this again and see what happens. thats the way you'll know for sure.

 

So what is the temp that you lowered to?

 

Temperature does not effect what sex a duckling will hatch. Just like humans the gender is decided genetically. What can happen is that with a change in the temperature more girls survive than boys- or vice versa. For example- Start with 20 eggs - a 10/ 10 split of sexes is reasonable- but doesnt usually happen in such small hatches. Change the temp and you may get 12 to hatch with a much greater proportion one sex.

 

Is sex always determined in every species through genetics? Because I have definitely heard that most reptiles' sexes are determined by temperature.

 

X2
Basically, the temperature never decides the sex; rather, it favours one sex or the other. Higher temp: boys will all survive, most girls won't. Lower temp: Girls will all survive, most boys won't. Something like that.