Porcine Rectal Prolapse Study Guide

Overview and Clinical Importance

Rectal prolapse is one of the most common gastrointestinal surgical conditions encountered in swine practice. It involves the protrusion of one or more layers of the rectum through the anus, resulting from increased intra-abdominal pressure that overcomes the weak muscular pelvic support mechanism. Compared to other farm species, pigs appear to be particularly vulnerable to this condition.

This condition can occur in any age group, from neonatal piglets to adult sows, but is most commonly seen in growing pigs aged 8 to 20 weeks, with peak incidence at 14-16 weeks of age. Males are more commonly affected than females. Rapid recognition and appropriate management are critical to prevent complications such as rectal stricture, hemorrhage, necrosis, and death.

Etiology and Pathophysiology

Classification

Rectal prolapse may be classified as incomplete (Type I), involving only the rectal mucosa, or complete (Type II), in which all layers of the rectal wall are everted. The fundamental mechanism involves an increase in intra-abdominal pressure that forces the rectal tissue through the anus, overcoming the weak muscular support of the pelvic region.