Unfortunately, that's a myth. There is no reliable way to determine the gender of a chick, in-ovo. If there was, every hatchery on Earth would be using it! Some people swear by egg shape and hatching temperature to predict genders - both of which have a pretty reliable 50/50 success rate - but we have yet to see any scientifically proven methods here on BYC. The first person to reliably figure it out will make a fortune selling the plan!
