Porcine Rectal Stricture Study Guide

Overview and Clinical Importance

Porcine rectal stricture is an acquired annular fibrous constriction of the rectum that results from chronic necrotizing enteric diseases. It represents a significant welfare and economic concern in commercial swine operations, causing production losses of 1-2% in affected herds. The condition is most commonly a sequela of Salmonella Typhimurium enterocolitis and is characterized by scar tissue formation that progressively narrows and eventually obstructs the rectal lumen, preventing normal defecation.

The condition occurs 4-8 weeks following severe enteric disease episodes. Understanding the pathophysiology, particularly the vascular anatomy and ischemic mechanism, is essential for NAVLE preparation. The disease has no effective treatment once established, making early diagnosis of underlying infections crucial for prevention.

Etiology and Pathophysiology

Primary Etiologic Agents

The most common cause of porcine rectal stricture is Salmonella enterica infection, particularly Salmonella Typhimurium. This bacterium causes severe enterocolitis with ulcerative proctitis that, upon healing, results in annular cicatricial ulcers in the affected rectal segment. Co-infection with Porcine Circovirus Type 2 (PCV2) has been documented to predispose pigs to salmonellosis through immunosuppression.