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Related Experiment Video

Updated: Dec 13, 2025

Methods for Studying Uterine Contributions to Pregnancy Establishment in an Ovariectomized Mouse Model

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Published on: April 7, 2023

Moody Mares-Is Ovariectomy a Solution?

Daniel Taasti Melgaard¹, Trine Stokbro Korsgaard², Martin Soendergaard Thoefner¹

¹Hoersholm Equine Clinic, Kongevejen 124D, 3480 Fredensborg, Denmark.

Animals : an Open Access Journal From MDPI

|July 26, 2020

Summary

This summary is machine-generated.

Bilateral ovariectomy in mares can improve unwanted behaviors and rideability. This surgical procedure showed positive results in horses with normal or neoplastic ovaries, suggesting a potential benefit for behavioral issues not linked to the estrus cycle.

Keywords:

moody mares ovarian neoplasia ovariectomy tumour unwanted behaviour

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Area of Science:

Veterinary Science
Equine Behavior
Reproductive Surgery

Background:

Unwanted behaviors in mares, such as aggression or uncooperativeness, are common veterinary issues.
These behaviors can range from ground handling difficulties to riding problems and inter-horse aggression.

Purpose of the Study:

To evaluate the impact of bilateral ovariectomy on the behavior and rideability of mares presenting with unwanted behaviors.
To compare outcomes based on the histological classification of ovaries (normal vs. neoplastic).

Main Methods:

Retrospective case series of twenty-eight ovariectomized mares.
Owners provided semi-quantitative scores (1-10) for behavior and rideability pre- and post-surgery.
Mares were grouped based on histopathologic ovarian diagnosis: 'Normal ovaries' or 'Neoplasia'.

Main Results:

Rideability improved post-ovariectomy in 80% of mares with normal ovaries and 57% with ovarian neoplasm.
Behavioral improvement was observed in 40% of mares with normal ovaries and 43% with ovarian neoplasm.
No significant difference in behavioral or rideability improvement was found between mares with normal versus neoplastic ovaries.

Conclusions:

Bilateral ovariectomy can be a beneficial treatment for mares with unwanted behaviors and rideability issues, even when not clearly linked to the estrus cycle or pain.
The procedure appears effective regardless of whether the ovaries are histologically normal or neoplastic.