Deworming & Internal Parasites

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Nightshade and Ivermectin: A Deadly Mixture

Editor’s note: When researching the unknown illness story on this page, the following study on ivermectin’s interaction with a noxious weed was discovered. Nightshade and other poisonous plants should be eliminated from pastures.

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Four Horses Dead, One Ill; Dewormer Questioned

Four horses on a South Texas farm died from unknown causes in February; one horse is recovering. The horses’ owner suspects the problems might have been caused by a dewormer; she has necropsy and other test results, but she has not released them

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Drug Resistance from Daily Dewormers

Are daily dewormers contributing to the development of drug-resistant parasites? A study from the North Carolina State University (NCSU) suggests they might be. The study used fecal worm egg count reduction tests (FWECRT) to evaluate small

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Four Horses Dead, One Ill; Owner Questions Dewormer

Four horses outside of Hebbronville, Texas, died after they showed clinical signs of an unknown illness in February; one horse is recovering. The horses’ owner suspects the animals’ problems might have been caused by a dewormer, and she is

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No Rotation Deworming (Excerpt)

Programs that use no rotation involve the continued use of one effective drug until it no longer reduces small strongyle numbers as indicated by fecal egg counts.

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Botulism (Book Excerpt)

Botulism is the most potent biologic toxin known, and horses are highly sensitive to its presence and effects.

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Pinworm Problems

My mare is being treated for pinworms. She incessantly rubs her tail, and uses the wall of her stall to lean on. Are these signs related?

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Deworming Strategies and Hurricane Recovery

The level of equine parasite transmission should be diminished on pastures that were so flooded they had to be evacuated, said Craig Reinemeyer, DVM, PhD, president of East Tennessee Clinical Research in Knoxville, Tenn. “Many larvae would get

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Deworming Principles (Book Excerpt)

A thorough parasite control program involves a complete understanding of helpful management practices and knowing how different types of dewormers work.

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Tapeworm Treatment Time

Tapeworms (Anoplocephala perfoliata) are the only major variety of cestode, or flatworm, to infect horses. Recent studies have shown they are more plentiful in horses than previously thought and have described the harm they can do.

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Killing Resistant Parasites

2005 EQUINE SCIENCE SOCIETY SYMPOSIUM, TUCSON, ARIZ., MAY 31-JUNE 3

“Parasite resistance has emerged as a dilemma in the livestock industry as many classes of parasites are becoming resistant to dewormers,” began Meghan

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Horse Care in the Fall

Fall deworming is important; winter is usually when internal parasites do the most damage and rob the horse of vital nutrients.

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Times Are a-Changin’

There are many of us old enough to remember nasogastric tube deworming of our horses. The vet would show up in his truck, haul out the buckets, pump, and hose, and we’d line up to twitch the horses and fill their stomachs full of whatever that

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