Progesterone Levels and Interovulatory Intervals of Mares Treated with Intrauterine Fractionated Coconut Oil

Intrauterine plant oil infusion, including one milliliter (ml) of fractionated coconut oil, was reported to be a safe, cheap and reversible option to prolong the luteal phase in mares when administered on day (D)10 of the estrous cycle. The objective of this study was to understand and compare the utero-ovarian response to one ml and 0.5 ml of coconut oil administered into the uterus using an insemination pipette and an embryo transfer gun, respectively, on D10 of diestrus. We hypothesized that intrauterine administration on D10 of both volumes of coconut oil with either infusion device would result in prolonged luteal function. [...]