Control of Equine Alimentary Parasites Flashcards
What is larval cyathostomosis?
Mass emergence of hypobiosed larvae, massive inflammatory reaction. Severe diarrhoea, often fatal.
How does strongyles cause disease?
They result in verminous arteritis, from GIT to cranial mesenteric artery, causing ischaemia areas of the large intestine, which can be fatal.
How long does is take strongyloides westeri to induce diarrhoea?
Infects foal through dam’s milk or via skin penetration. Induces diarrhoea ~6 months later
When are horses at the greatest risk of parascaris equorum?
Around 6 months and up to 2 years.
What disease does parascaris equorum cause?
Small intestinal obstruction
What the main clinical sign of oxyuris equi?
Horse develops severe anal pruritis
List three things that a tapeworm infection can cause.
Incidence of spasmodic colic, increasing with burden.
Can cause intussuseption.
Thickened SI wall at ileo-caecal junction, leads to food impaction.
What is the scientific name for bot fly in horses?
Gasterophilus
Define resistance.
The genetically transmitted loss of sensitivity in parasite populations previously sensitive to the same drug.
What is refugia?
Refugia are those parasites in the horses environment that are not exposed to an anthelminitc at each dose.
How do you measure resistance to parasites?
Faecal egg count reduction test
Which parasite does the faecal egg count reduction test not work for?
Tapeworms
What are the four main groups of anthelmintics available for equine use in the UK?
Avermectins - ivermectin, moxidectin
Benzimidazoles - fenbendazole
Praziquantel
Pyrantel
What are the two drug types that can be used to kill cyathostomes and when should you use them?
Moxidectin or a 5 day course of fenbendazole.
Used once a year in winter.
Which 4 anthelmintic drugs are stronglyes susceptible to?
Ivermectin
Moxidectin
Pyrantel
Fenbendazole
