That would be me doing the egg shape/gender experiment. And, I challenge Ronott1, and others that say it doesn't work, to disprove the theory. Set all round eggs, or for that matter, since you say it doesn't work, set all pointed eggs, and post your results. Sounds hokey, but I can't dispute my increased pullet rate with the egg shape selection: Was getting 40% pullets before, increased rate to 60% pullets in the last 3 hatches. I don't like to be argumentative, but when someone says it doesn't work, in spite of positive results that those who play with this theory are getting, I have to stick in my 2 cents worth. So, no matter what your opinion, if you have your own eggs from your own flock, play around with it. Yes, I have a small sample in my 3 hatches, (gotta start somewhere, right?) So... come on folks, play with it!