Equine Infertility Study Guide

Overview and Clinical Importance

Equine infertility represents a significant challenge in both mare and stallion reproduction, with major economic implications for the breeding industry. Infertility in horses can result from anatomical abnormalities, endocrine disorders, infectious diseases, poor breeding management, or age-related changes. Understanding the diagnostic approach and management of reproductive disorders is essential for NAVLE success and clinical practice.

The NAVLE specifically tests on infertility in mare or stallion under the Equine Reproductive competency domain. This guide covers the major causes, diagnostic algorithms, treatment protocols, and prognosis for common reproductive disorders in both sexes.

Part 1: Mare Infertility

Mare infertility encompasses three main categories: mares that fail to cycle, mares that cycle normally but do not conceive, and mares that conceive but suffer early embryonic death. Endometritis is the most common cause of infertility in mares, affecting 25-60% of barren mares. Healthy mares under 16 years of age have approximately 70% conception rate per cycle when properly managed.