If your goal is to make females so you are not disappointed with all males fighting it out for territory in your rearing pens then here is what we do:



In the animals in which it is known, the gender is set at 1/3 of the incubation period. To be sure we catch it, we incubate at 90F for approximately half the expected incubation period. We then move the eggs to a cooler 83F until they hatch. I have done this with CDT, redfoots, sulcata, leopard, russians, hermans, greeks, stars and perhaps others I am not remembering.



Personal experience dating to the early 1990's has shown this to be both effective and safe in all species. No extra scutes, that do not match extra scutes on the parents, are produced. All fertile eggs hatch. No two headed or mis-shapen carapaces. No odd hatching results of any kind.



The CDT were 48 females from three years egg production of one female my neighbor had. It took four years to confirm my results. Some of those successfully reproduced in her fifth summer.



I have been telling this regimen to people for a decade now. I am sure other methods will work. Why is it few, if any, utilize it? Why do all the breeders keep making males? Why?
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