Bovine Vaginal Prolapse Study Guide

Overview and Clinical Importance

Vaginal prolapse (eversion) is one of the most common prepartum reproductive emergencies in cattle, occurring predominantly during the last trimester of pregnancy. This condition involves the protrusion of vaginal tissue through the vulva, which can progress to include the cervix (cervicovaginal prolapse) and occasionally entrap the urinary bladder. Early recognition and appropriate management are essential to prevent complications including tissue necrosis, urethral obstruction, peritonitis, and reproductive failure.

Understanding vaginal prolapse is critical for the NAVLE examination because it tests knowledge of reproductive anatomy, surgical techniques, anesthetic protocols, breed predispositions, and the important distinction between vaginal and uterine prolapses. This condition is frequently encountered in bovine practice and represents a significant category of reproductive emergencies.

Etiology and Pathophysiology

Mechanism of Prolapse

The prolapse begins as an intussusception-like folding of the vaginal floor just cranial to the vestibulovaginal junction. The discomfort caused by this initial eversion, combined with irritation and swelling of the exposed mucosa, triggers straining (tenesmus), which leads to more extensive prolapse. Eventually, the entire vagina may prolapse with the cervix visible at the most caudal portion of the protruding tissue.