Porcine Hernias Study Guide

Overview and Clinical Importance

Hernias are among the most common congenital abnormalities in swine production, representing a significant source of economic loss and animal welfare concerns. Hernias occur when abdominal contents protrude through a defect in the body wall, forming a sac-like structure. In pigs, the two primary types are umbilical hernias and inguinal/scrotal hernias. The overall incidence ranges from 1.5% to 6.7% in commercial pig populations, with heritability estimates around 0.25-0.34, indicating moderate genetic influence combined with environmental factors.

Understanding hernia identification, prevention, and management is essential for NAVLE preparation, as questions frequently address breed predispositions, surgical considerations during castration, and transport fitness decisions.

Classification of Porcine Hernias

Etiology and Pathogenesis

Genetic Factors

Hernias in pigs have a polygenic inheritance pattern with heritability estimates of 0.25-0.34. Key genetic findings include candidate genes ACAN, MAP1LC3C, VIT, SYNPO2, ACER2, and KCNMA1 involved in extracellular matrix integrity, muscle function, and cell adhesion. QTL regions on chromosomes 2, 4, 7, 8, 13, and 14 are associated with hernia susceptibility.