Hung, quite appropriately, like a horse, American Pharoah, the 2015 Triple Crown winner, is now an expensive trick.

The animal has been retired to a life of studding, earning his owners a cool 200K a pop to impregnate mares. Very interested parties pray he’ll sire the next generation of racers to make a home of the winner’s circle, not a sure thing for even a great champion, genetics still being an inscrutable thing. It’s a sensitive business to coerce the mating process at a specified time between two gigantic beasts, no matter how willing they are, and a stumble could mean a broken leg or some similar disaster. With so much money at stake–both the current payoff and potential ones in the future–steps must be taken to ensure success.

In a Businessweek piece, Monte Reel goes behind the scenes to learn how the delicate balance is struck. The opening:

The verb to use in polite company is “cover.” The stud covers the mare. Or: About 11 months after she was covered, the mare gave birth to a healthy foal.

The deed itself, here in the hills of Kentucky horse country, is governed by strict rules. Section V, paragraph D of The American Stud Book Principal Rules and Requirements is clear: “Any foal resulting from or produced by the processes of Artificial Insemination, Embryo Transfer or Transplant, Cloning or any other form of genetic manipulation not herein specified, shall not be eligible for registration.” No shortcuts, no gimmicks. All thoroughbreds must be the product of live, all-natural, horse-on-horse action.

Herein lurks tension and peril. When one 1,300-pound animal climbs on top of another, both sacrifice their natural sure-footedness for about 20 seconds of knee-buckling magic. Necks can be bitten, causing legs to kick and prompting centers of gravity to shift. An unlucky fall could break a delicate foreleg—a potentially fatal injury for a thoroughbred.

“Things can go wrong,” says Richard Barry, the stallion manager at Ashford Stud, a 2,200-acre farm in Versailles, Ky. “Before any stallion is led into the breeding shed, there’s an awful lot of preparation that has gone on behind the scenes. An awful lot.”

Barry will soon choreograph the most hotly anticipated covering in recent history: American Pharoah’s first coupling with a mare.•