ANS 3216 Lecture Notes - Lecture 35: Abdominal Obesity, Emaciation, Laziness
17 Jan 2016
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External: internal live inside of and feed on the host, external live on and feed on the host. Disease depends on: type of parasite, number of parasites, defenses against the parasite. Flies, maggots, mites, etc. are all used as immediate hosts for transport of other parasites: infect other hosts via broken skin, ingestion, or from other hosts. Common effect: summer sores : flies deposit larvae around a wound, parasites are unable to continue in their life cycle until ingested, larvae can remain dormant for 6-24 months. Internal parasites include: ascarids, strongyles, both large and small, pinworms, threadworms, stomach worms, stomach bots, tapeworms. Life cycle: eggs on the grass, horse eats the grass and eggs, the eggs hatch in the horse"s gut, larvae mature into adult worms, mature worms lay eggs. Roundworms : 12 to 15 inches long, an inch wide. Mostly an issue in young and old horses: middle aged horses have immunity. Effects the: udder/teats, small intestines, liver, lungs.
