Listen, I fully agree with the practice of culling sick or underdeveloped/deformed babies. I also agree that we should not breed kinked or deformed animals. But I am not quite sure how cutting eggs even enters into this discussion. Tampering with the natural process of reproduction? Hardly. A baby is either going to make it or it isn't. Unless you are cutting eggs and popping the babies out to see what you have or moving the baby around in the egg, then how exactly are you multiplying the chances of producing non viable babies?