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J Equine Sci. 2017;28(4):163-167. doi: 10.1294/jes.28.163. Epub 2017 Dec 16.

Factors affecting the prognosis for uterine torsion: the effect of treatment based on measurements of serum progesterone and estradiol concentrations after surgery.

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Hokkaido South Agricultural Mutual Aid Association Mitsuishi Animal Medical Center, Hokkaido 059-3105, Japan.
Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, Hokkaido 057-0171, Japan.
Department of Clinical Veterinary Science Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan.


This is a retrospective study of uterine torsion (UT) in seven mares. In two cases, serum progesterone and estradiol concentrations were also investigated. The mare and foal/fetus survival rate was 57% (4/7). Four cases presented with clockwise torsion, and two cases presented with counterclockwise torsion. The direction was undetermined in one case. The degree of torsion varied. Correction of torsion was performed by ventral midline celiotomy in all cases. In the two cases with measured hormone levels, elevated levels of P4 were decreased through medication. All mares discharged from the hospital with a live fetus were able to carry a live fetus. Early diagnosis and treatment of UT increases the possibility of helping mares and foals in cases with acute UT.


estradiol; mare; progesterone; uterine torsion

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