Sunday, February 12, 2012

Fact sheet on nasal bots

It's hard to find much information (on the web) about nasal bots, an external parasite that can affect sheep and goats. Last year, the Department of Agriculture and Food in Western Australia published a 2-page fact sheet on nasal bots in sheep. 

Nasal bots are the maggots or larvae of the sheep nasal bot fly, Oestrus ovis. The pest probably originated from Africa, but is now present throughout the world wherever there are sheep and goats. Diagnosis is usually made on the basis of sheep behavior. Goats rarely show signs of infestation.

The current treatment for nasal bots is usually an ML (Macrocylic lactone) worm drench, such as ivermectin, but the fact sheet does not recommend anthelmintic treatment solely for nasal bots, unless the health of the animal is being affected.

According to the fact sheet, fly activity is seasonal and usually peaks in the late spring and summer when temperatures  exceed 20° C (68° F).  However, the pattern of fly activity varies between regions.

Nasal Bots in Sheep

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