Peer-reviewed veterinary case report
Mare unable to get pregnant due to cervical duplication
By Cortes, D et al.·Published in Journal of equine veterinary science·2026·Department of Large Animal Medicine, United States·View original on PubMed →
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Original publication title: Infertility in an American Quarter Horse mare with cervical duplication.
- Species:
- horse
Plain-English summary
A 13-year-old American Quarter Horse mare was brought in because she had been unable to get pregnant despite multiple breeding attempts. During a breeding soundness evaluation, the veterinarian discovered an unusual cervical shape, which was later confirmed to be a condition called cervical duplication. This abnormality was causing fluid buildup in her uterus, which likely contributed to her infertility. After identifying the issue, the mare's reproductive health could be better managed, but the report does not specify the exact treatment or outcome for her future breeding attempts.
People also search for: horse infertility causes · American Quarter Horse breeding problems · cervical duplication in mares · mare reproductive health issues
Abstract
Cervical duplication is a disorder of sexual development (DSD) that may be present in the absence of chromosomal aberrations. It is a rare cause of infertility in mares and is attributed to the failure of the Müllerian ducts to fuse properly, leading to the persistence of the median walls along the whole length of the cervix. This case report involves a 13-year-old American Quarter Horse mare with cervical duplication. Prior to this diagnostic, the mare was bred multiple times, but pregnancy was not achieved. The mare presented for a breeding soundness evaluation. During the examination an aberrant cervical conformation was palpated and further investigated. Cytogenetic analysis and a PCR for the Y-linked SRY gene and the X-linked androgen receptor gene was performed. A normal 64,XX, SRY-negative karyotype was determined. Infertility was associated with cervical abnormality, affecting in some degree uterine clearance causing accumulation of fluid seen on ultrasound.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/41564982/