I want to eventually raise chicks. This would help in determining how many hens you want at a time. It would help lower the rooster factor and having to determine what do with them.Rounded shaped and wide eggs were more likely to produce female chicks. While pointed shaped and narrow eggs were more likely to produce male chicks. This is quoted from lazy gardener's "Egg shape for gender selection" article. This study was conducted with a Super Nick white layer breeder flock. Not sure if this works for all breeds, but it sure would save a lot of having to deal with too many roosters. I had two eggs in the nest box this morning, both were long and pointy. Saved them from being slaughtered, they went in the fridge. The article has lots of statics for those of you who want numbers. But in conclusion egg shape has something to do with it.