Other Worm Control Practices for Horses

Recently Horsemen’s Laboratory was asked what other practices an owner can use to control worms in addition to deworming, especially for the worms that cause summer sores (Habronema). Since Habronema larvae are spread by stable flies and house flies, the best practice to help control them is to control the fly population in your horses’ environment. … Read more »

Large Strongyles (Blood worms) Migrating Strongyles

Large strongyle larvae penetrate the large intestinal wall and migrate through different abdominal organs.  There are 4 species of large strongyles, Strongyles vulgaris, Strongylus edntatus, Strongylus equinus, and Triodontophorus.  Until around 1980 Strongylus vulgaris was the most harmful worm in horses.  The larvae migrated through the abdominal organs and into the main artery that supplies… Read more »

Small Strongyles (non-migrating) Cyathostomins

Small strongyles have several names. One is scientific Cyathostomins. Another is non-migrating due to the fact unlike migrating or large strongyles that the larvae migrate through several abdominal organs. Small strongyles only burrow into the mucosal lining of the large intestine and become encysted there normally for 2-3 weeks, but may remain encysted and viable for… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #6:  Death Please be sure to read the last paragraph of this article. Deaths in horses have occurred in the past due to worms and may continue to occur, but at a much reduced rate.  The introduction of Ivermectin as a deworming medication has been a large factor in the decreased death rate… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #5:  Tail Rubbing The characteristic tail rubbing associated with worms is generally due to pinworms.  The female pinworm partially exteriorizes itself and lays her eggs around the rectal ring.  The eggs stick to the skin with a substance similar to egg whites.  This substance causes an itchy sensation causing the horse to… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #4:  Ulcers Bots, Draschia megastoma and Habronema musccae are 3 classes of worms that can be responsible for ulcers in the stomach.  Bot worms are the larval stage in the cycle of a Bot fly.  They look like a small honeybee and they fly around horses’ legs, gluing eggs to the hair… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #3:  Chronic cough, Runny nose Round worms can also be responsible for coughs and runny noses in young horses most often under one year of age, but may even occur in horses slightly older.  One stage of the life cycle of the roundworm is larval migration to and through the lungs.  During… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #2  Wormy Horse Syndrome:  Weight Loss, Diarrhea, Stunting, Poor Hair Coat, Depression, Poor Appetite, and Potbelly appearance  I have elected to discuss all these problems together because they all appear to occur together.  The problems are generally seen in young horses less than 2 years of age.  They are most often… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DWM Problem #1:  Colic Colic just means a horse has pain in its abdomen.  There are many causes of this pain and different worms can cause colic.  Round worms can cause the pain when a young horse, such as a weanling or yearling, is heavily infected with adult round worms.  These young horses seem… Read more »

The Importance of Performing Fecal Egg Counts on Your Horse

Below is a link to an informative article on the importance of performing fecal egg counts on your horse written by Dr. Craig Reinemeyer.  Occasionally I refer to “Equine Parasite Control”, the book he wrote with Dr. Martin K. Nielson because Dr. Craig Reinemeyer is dedicated to improving horses’ health through parasite research.  Dr. Reinemeyer… Read more »