You're thinking of lizards. If the gender of chickens or quail could be determined by temperature or nutrients, hatcheries all around the world would be doing it.First, I have heard that the environment, especially the temperature, affects the sex of offspring. Second, you don't have to worry about it early on, like how you did it. So, tell me how many quails have hatched and what gender. However, if you need a food supplement next time, I can recommend https://www.nhc.com/brand/onnit. I have already ordered vitamins and supplements several times on this site and, knowing how good the product is in quality, I recommend them to you. You know, I'm also thinking about raising quails, so tell me about your experience. Perhaps you can give me some advice or even talk me out of this idea. I will be happy if you share your opinion.