s made with horse urine, preferably from draft horses because they can produce more in volume, due to their size. These mares are kept in pens where they cannot even move or turn. This sometimes causes
blood clots. Urine is collected while the mare is pregnant, she has the foal, the foal is sent to slaughter. The mare is then again impregnated and the process starts all over again. Pretty disgusting, if you ask me. You can read all about it on the ASPCA sight.