Breeding the ‘difficult mare’

Summary

# Editorial Summary: Breeding the 'Difficult Mare' Despite horses' reputation for relatively high fertility compared with other species, mares presenting with subfertility or reproductive dysfunction remain a common clinical challenge. Barker's 2020 review synthesises the diverse aetiologies underlying reproductive difficulties, examining both the diagnostic approaches and evidence-based interventions that can improve pregnancy outcomes. The article emphasises that systematic clinical assessment—combining thorough history-taking, appropriate diagnostic tools, and targeted treatment protocols—significantly increases the probability of achieving pregnancy, even in mares with complex or multifactorial reproductive problems. For equine practitioners, the practical value lies in its structured framework for investigating subfertility; rather than viewing a difficult mare as an intractable problem, the systematic approach provides confidence that reasonable diagnostic steps have been exhausted before prognostic conclusions are drawn. Understanding the common presentations and their management options is essential for vets, nutritionists, and coaches working with breeding stock, as early intervention and coordinated care can substantially improve reproductive outcomes.

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Key Findings

• •Horses have relatively high fertility compared to other species, yet mares with subfertility present significant clinical challenges
• •Diverse causes underlie 'difficult mare' classification, requiring systematic diagnostic approaches
• •Systematic evaluation with appropriate diagnostics and targeted treatment can improve pregnancy outcomes in majority of subfertile mares

Conditions Studied