Great post Joe. I am a numbers guy, and record copious amounts of data. However, I have never accumulated in one place the egg weight versus the hatchling weight. I do have it, but I trust that your theory makes sense in my mind. Lower temps allow the animals to absorb yolk a bit longer. As a cutter of eggs, I believe that temp has little to do with it, because I "prompt" them out a bit early, and this may be why I see some dropped yolks. With that said, I produce a considerable amount more eggs than you documented, and it may just be that I am seeing more unabsorbed yolks, due to the larger sampling size.

As far as your sex thing, I will have to agree with Brad, in that sex determination in Ball Pythons I belive is chromosome dependent. Two years ago, I produced a very male heavy season, and last year, I was very female heavy. Both years, the incubator was within 1 degree of incubating temps.

Great work, and keep up the studying. It is always fascinating to look at numbers, and see if there are any pieces of the puzzle that we have been missing.