ANSC 2251 Lecture Notes - Lecture 11: Electronic Program Guide, Botfly, Habronema
Document Summary
Parasitism one organism benefits, the other is harmed. Migrate through all tissues of horse as larvae. Build up resistance by the age of about 2. Elongated cylindrical worms from 2 35 mm in length. Most have a direct life cycle and need only a definitive or final host to complete its life cycle. Some need an intermediate host like a fly or tick. Have a complete digestive system (why they dont need a host) Larvae live in anterior mesenteric artery supplying the small intestine. Adult lives in large intestine, cecum & causes ulcers on mucosa. S. edentatus and s. equinus migrate through other organs especially liver, pancreas and cause damage. Signs of this parasitization include: anemia, unthriftiness, colic, anorexia, malaise (lethargy), soft feces with foul odor, sometimes legs and abdomen will swell. S. vulgaris & s. edentatus adults: fenbendazole, ivermectin, moxidectin, oxfendazole, oxibendazole, pyrantel pamoate, pyrantel tartrate daily or single.
