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Parasites
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Parasite
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Organs
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Ages
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Symptoms
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Strongyles (bloodworms)
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Larvae-arteries, liver and gut wall
Adults-large intestine
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All ages but young at high risk
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Stunted growth, loss of weight, poor appetite, rough hair coat, general weakness, anemia, diarrhea, recurrent colics, death.
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Ascarids (roundworms)
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Larvae-liver & lungs
Adult-small intestine
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Young (under 2 years of age)
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Stunted growth, pot bellied, rough hair coat, digestive upsets, pneumonia, death.
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Bots
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Eggs-on hair
Larvae-tongue & gums
Bots-stomach
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All ages
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Excitement (by flies), digestive upsets
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Pinworms
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Larvae-large intestine
Adults-large intestine & rectum
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Larvae affect all ages
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Tail rubbing
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Strongyloides (threadworms)
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Larvae-lungs & small intestine
Adults –small intestine
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Foals
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Diarrhea, dehydration, weight loss.
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Guidelines for deworming horses should be at least four times a year. Using a deworming product that kills strongyles, ascarids and pinworms. In early spring and late fall use a product that also has a botacide in it to kill bots. It is recommended to deworm foals and weanlings every 30 to 60 days for the first year of their life.
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