N.Y. Racing, Pari-Mutuel Wagering and Breeding Law § 242

§ 242. Races for horses bred in the state. The commission in granting\na license to a corporation to conduct running or steeplechase races at\nits racetrack, if the commission deems such requirement practicable, may\nrequire such corporation to provide for at least one race during the\nracing season in which the entries shall be exclusively horses foaled in\nthis state.\n