A total of 88 thoroughbred mares were diagnosed with clinical ovarian quiescence and
subjected to four treatment regimens. Using PMSG, hCG or combinations of both. A high dose
combination of 5,000IU PMSG with 5,000IU hCG showed significantly higher rates of marked
estrus and ovulation induction (P<0.01) as well as conception rates (P<0.05). In the
present study, the administration of a high-dose combination of PMSG with hCG was shown to
be an effective treatment of ovarian quiescence in light mares.