Internal Worm Parasites of Livestock

Parasitic worms that live inside the bodies of farm animals, such as roundworms in the stomach and flukes in the liver. A disease belongs here when its cited article names a roundworm, flatworm or other worm as the cause. They are picked up from pasture, water or snails, and heavy burdens cause anemia, weight loss, poor milk yield and death, especially in young animals and in wet seasons. Many worms have developed resistance to common dewormers, so control now combines pasture management, selective treatment, testing of worm egg counts and breeding for resistance. This heading gathers them so a visitor can compare their hosts, life cycles and control.