Equine Parasitology

Question 1

Which is the most common GI parasite in horses?

Answer 1

Cyathostomins (small strongyles)

Question 2

What happens when cyathostomins are killed by an anthelmintic drug?

Answer 2

Larvae repopulate intestine

Question 3

What anthelmintic can kill hypobiotic larvae of small strongyles?

Answer 3

Moxidectin

Question 4

To intervene most effectively and efficiently in parasite control, you need:

Answer 4

Knowledge of transmission
Knowledge of individual clients and circumstances
Use of integrated parasite control (IPM or IPC)

Question 5

Major parasites in horses?

Answer 5

GI strongylid nematodes (large, small strongyles)
Parascaris
Oxyuris
Anoplocephala
Flies (inc. bots)

Question 6

Macrocylclic lactones include:

Answer 6

Ivermectin: Eqvalan, Eqvalan Gold, generics
Moxidectin: Quest, Quest plus

Question 7

Benzimidazoles include:

Answer 7

Fenbendazole: Panacur, Safeguard
Oxibendazole: Anthelcide

Question 8

Pyrantel products include:

Answer 8

Pyrantel pamaote: Strongid P
Pyrantel tartrate: daily feed supplement, Strongid C and others

Question 9

Praziquantel treats:

Answer 9

Tapeworms only

Question 10

Best time for dewormer use is:

Answer 10

Right before grazing season

Question 11

In the fall, the best combination of dewormers is:

Answer 11

Macrocyclic lactone + praziquantel to include bots and tapeworms

Question 12

For encysted small strongyles, which dewormer will best target:

Answer 12

Moxidectin or Fenbendazole (Fenbendazole: 5 days of double dose)

Question 13

What are the best methods for reducing exposure to strongylid larvae on pasture?

Answer 13

Limit time on pasture
Rotational grazing
Mixed/alternate grazing
Make hay from pasture regrowth
Dragging pastures

Question 14

Manure removal on pasture works well for _____ but not ______

Answer 14

Horses, not ruminants