The effect of exogenous oxytocin on luteal function in mares

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Abstract
Daily injections of 150 units oxytocin administered to 6 mares on Days 4, 5, 6, 7 and 8 after ovulation (Day 0 = ovulation) failed to induce luteolysis as indicated by the maintenance of normal plasma progestagen concentrations and the occurrence of normal ovulatory intervals. Three additional mares were given estrogen injections 24 h before an injection of oxytocin on Day 7 after ovulation, but this treatment also failed to induce luteolysis since plasma progestagen concentrations were maintained in all 3 mares. Two mares exhibited normal ovulatory intervals, while the 3rd developed a corpus luteum which persisted for 46 days.

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