A Danish study investigated if removing a mare's ovaries could offer relief from unexplained unwanted behavior. The changes in behavior were assessed by the owners of the horses. Some mares used in the study had ovarian cancer; others had no veterinary-diagnosed reason for their unwanted behavior.
Removing the ovaries was final attempt to resolve the unwanted behaviors as drug use to stop their reproductive cycles had failed and no issues with their reproductive tract could be found. Unwanted mare behavior can range from being uncooperative to aggression aimed at humans or other horses.
Drs. Daniel Taasti Melgaard, Martin Soendergaard Thoefner, Trine Stokbro Korsgaard, Morten Roenn Petersen and Hanne Gervi Pedersen, used the records of 28 mares that had their ovaries removed six to 24 months earlier and followed up with the horse owners, asking them to complete a questionnaire and respond to a telephone interview. Ten of the horses in the study had normal ovaries, 14 of the mares had ovarian cancer in one or both ovaries, and the other ovaries of the other horses were not examined for the presence of cancer.
Eight out of the ten mares (80 percent) with normal ovaries had improved rideability after their ovaries were removed; rideability improved in 57 percent (eight out of 14) in the mares with ovarian cancer. Mare behavior improved in about 40 percent of the cases studied.
The researchers conclude that mares without ovarian cancer may benefit as much from ovary removal as mares with ovarian cancer, showing improved rideability and behavior, though there is no obvious explanation as to why mares with normal ovaries benefited. The team noted that owner perception of improved behavior could be a placebo effect because they assumed the operation would work. They also stress that horses have a through diagnostic workup to rule out other issues before an ovariectomy is performed,
Read the full study here.
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