If you are breeding your own or outside mares, this gadget will save you lots of money in vet bills! It is VERY accurate, very easy to use and not only will save you $$ but lots of time in teasing mares, bringing them to a stallion or vice versa. It works on cattle as well. Why pay full price and ship from the US, when you can get it in a perfect working order much cheaper from WA? the link below tells you exactly what it is* Please PM for the price. Ovascan ovulation monitor for livestock, from Animark. When is the best time to breed horses, cattle?