To solve this problem, my team and I are developing a genetically modified (GM) line of chicken. It will have a gene encoding a protein from a jellyfish which fluoresces green under ultraviolet light (very useful if you are a chicken at a disco). We hoped to put this gene into one of the sex chromosomes, so that only females of such a line will be fluorescent. If this can be achieved, it is likely that the sex of chicks within the egg could be determined by simply scanning the eggs with a laser and detecting fluorescence in female embryos and its absence in males. Eggs containing males could then be disposed of early during incubation in a simple automated process.
Bogus question …either or….pffft!