If you can keep a temperature constant (within 1/2 a degree C), you can get almost all females at 32C. This happens in the first third of incubation (setting the sex) and the temperature after this makes no difference other than how fast the eggs will hatch. Most incubators aren't this accurate unless you add a more expensive thermostat. 30.5C is the half way point (where you basicly get a 50/50 mix of the sexes). Above this you get more females than males and below this you get more males than females.
Danny
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