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Equis ISSN 2398-2977

Female: diestral ovulation

Contributor(s): Terry Blanchard, David Dugdale, Graham Munroe, Sarah Stoneham, Madeleine L H Campbell

Introduction

  • Ovulation in the presence of a functioning corpus luteum, without signs of estrus, is relatively common in cycling mares.
  • Diestral ovulations may occur between days 2 and 15 of the luteal phase.
  • These ovulations are frequently detected if mares in diestrus are examined regularly ultrasonographically.
  • Ovulation during diestrus can prolong diestrus as the recently developed corpus luteum is refractory to prostaglandin F2-alpha (which normally ends diestrus by causing luteolysis).
  • Cause: development of an ovarian follicle which ovulates during diestrus.
  • Signs: behavioral signs consistent with being in diestrus, ie not receptive to 'teasing'.
  • Diagnosis: ultrasonography, palpation.
  • Treatment: exogenous prostaglandins.
  • Prognosis: good to excellent.

Pathogenesis

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Diagnosis

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Treatment

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Outcomes

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Further Reading

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