Progesterone Levels at the Expected Time of Luteolysis in Diestrus, Pregnant, Carbetocin and Oxytocin Treated Mares

Oxytocin is an inexpensive, safe and reversible means of estrus suppression when administered on days 7 to14 of the estrous cycle, however a related compound, carbetocin, was reported to shorten the luteal phase. To better understand the ovarian response to these related hormones a study was designed with the objective of comparing progesterone (P4) profiles in diestrus (Diest), pregnant (Preg), carbetocin (Carb) and oxytcocin (Oxy) treated mares at the expected time of luteolysis. We hypothesized that Carb administration would result in premature luteal regression. [...]