I just want to say that I used to breed goats and if you use apple cider vinegar in their water you are more likely to get girls than boys. We did this one time with our old goats and we got all girls and 1 boy, out of our does.
So my question is, is there any thing that assures you get more filly's than colts when breeding? Any type of liquid in the water or food? I know horses are different from goats but I thought it would be an interesting topic especially in horseforum for horses.