Parasites: Internal Parasites of Horses

Parasites: Internal Parasites of Horses

Internal parasites are small organisms that live a portion of their life cycle in a host animal — in this case, the horse. They live in internal organs, body cavities, and tissues while gaining their nutritive source by feeding on the host animal.   Above is a...
Parasites: Ascarids

Parasites: Ascarids

Parascaris equorum, the horse roundworm. A large yellow to white parasite (females may be up to 15 inches long). Ascarids may appear in the feces of infected horses. Adult horses can develop resistance to this parasite; thus, roundworms primarily infect young horses...
Parasites: Bots

Parasites: Bots

Bots are a type of intestinal parasites that are larvae of the botfly, Gasterophilus. Female botflies lay their eggs by attaching them to the hairs of the horse. Different species lay their eggs on different parts of the horse’s body. Gasterophilus nasalis lay their...
Parasites: Large Strongyles

Parasites: Large Strongyles

Strongyles are grouped as either large or small. The three primary species of large strongyles that infect the horse are: Strongylus vulgaris Strongylus endentatus Strongylus equinus The adult form of all strongyles (large or small) live in the large intestine. The...

Parasites: Small Strongyles

The small strongyle is considered to be the most common internal parasite of horses. The adult form of all strongyles (large or small) infects the cecum and ventral colon of the horse. When large numbers of larvae invade the intestine, the horse may become clinically...