I was told many years ago by an old farmer who raised all his own livestock and food that when you are choosing eggs to set, you should always choose the ones that are more rounded, because the round eggs are pullets. He always had an abnormally high ratio of pullets hatch, and when we have folloed his advice, we too have gotten a high ratio of pullets. I am going to get an incubator soon, and will then be able to REALLY put his theory to the test. (The last time I set eggs to hatch (a couple of years ago), I put 10 eggs under a hen and chose 6 rounded eggs and then 4 that were less round. 9 babies hatched out, one egg didn't pip, and 6 of those resulting babies were hens. I didn't pay attention to who came from what egg, or what egg died, so it was NOT a scientific study for sure.) I recently learned that it is the HEN who determines the gender of the babies, so this is starting to sound like it COULd be true.... Have any of y'all heard anything like this?