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Okay. The longer a woman is "aroused" the more likely she is to have a higher pH in the Fallopian tubes. Male sperm do better in a higher pH, female sperm in a lower pH. It is thought that the reason the men of Israel were circumcised is because their arousal would be slower and thus they would...

Ital, the way humans regulate pH for gender has nothing to do with food. This is a family forum so I'll just leave it at that. If you can figure out how to control gender of chicks, or how to tell if they are male or female when laid, that would be so cool!

I can't speak to chickens, but in humans the pH level of the female strongly influences whether X or Y sperm get to the egg first. I won't go into detail of how you change the pH. But, on that note, if a chicken is stressed, that may affect the pH level of her system.