Porcine Gastrointestinal Parasites Study Guide

Overview and Clinical Importance

Gastrointestinal parasites represent a significant economic and health concern in swine production worldwide. While modern confinement systems have reduced parasite prevalence, infections remain common in outdoor operations, small-scale farms, and wherever sanitation is suboptimal. The NAVLE specifically lists parasites (internal, gastrointestinal) as a key topic under Porcine Gastrointestinal and Digestive diseases.

The primary GI parasites affecting swine include nematodes (roundworms, whipworms, threadworms, nodular worms) and protozoa (coccidia). These parasites cause subclinical production losses, overt clinical disease, and significant economic impact through reduced feed efficiency, decreased weight gain, liver condemnation at slaughter, and increased susceptibility to concurrent infections.

Ascaris suum (Large Roundworm)

Ascaris suum is the most common and economically important internal parasite of swine. It causes significant production losses through reduced feed efficiency, impaired growth, and liver condemnation (milk spots). This is a high-yield NAVLE topic.