Abstract
SummaryBackgroundEndometrosis, a multifactorial disease, is an important cause of subfertility in the mare, and its management is reliant on histological classification.ObjectivesThis study aimed to determine the association between increased endometrial biopsy grade with first a mare's breed specifically either Thoroughbred or non‐Thoroughbred, age and barren status and second, a clinical history indicating one or more of acute endometritis, positive bacterial culture, previous dystocia and uterine fluid retention.Study designRetrospective case series.MethodsThis retrospective study used historical reproductive data (2000–2015) from a population of 41 subfertile mares of various breeds, but mostly Thoroughbreds (30/41; 73%). Biopsies were interpreted by a single, experienced evaluator using the Kenney–Doig classification (1986).ResultsEndometrial biopsy grade was positively correlated with age (ρ = 0.606; p = 0.001) but not associated with other evaluated variables (p > 0.05).Main limitationsUse of a small, non‐randomly selected subfertile mare population.ConclusionsMare age was an important predictor of her reproductive performance, and performing an endometrial biopsy is therefore indicated in older mares.
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