Veterinarian Canelo carries an artificial mare vagina after she extracted semen from a stud horse at the equine reproduction Genetec center dedicated to polo horses in Los Cardales

Veterinarian Ana Canelo carries an artificial mare vagina after she extracted semen from a stud horse at the equine reproduction Genetec center dedicated to polo horses in Los Cardales, north of Buenos Aires, Argentina, May 7, 2015. Veterinarian Cristian Sporleder, whose genetics laboratory has been tapping the high-rolling polo market for 15 years, explained how embryos created using the sperm and ovum of top performing polo horses can be implanted in surrogate mares, thus allowing the female polo horses to continue their careers without getting pregnant. Picture taken May 7, 2015. REUTERS/Enrique Marcarian