Flashcards in Equine mites and lice Deck (29)
What class of ectoparasites are mites? What order?
What are the two types of mites? Which cause mange?
Both cause mange and dermatitis
Describe the morphology of all mites
8 legs in adult/nymph
No distinct abdomen
What mites are found in cattle, sheep and goats?
What mite is found in dogs?
What is the only mite (we need to know) in horses? Is it burrowing or non-burrowing
What do Chorioptes bovis mites feed on? How is their mouth adapted for this?
In what season does Chorioptes bovis affect horses? What part of the body do they affect?
Lower limbs (particularly feathered animals)
Describe the morphology of Chorioptes bovis
Round head and mouthpart
Thumb print on body
Very short pedicles at front with cup shaped suckers
How log is the life cycle of chorioptes bovis?
What signs do horses show in response to Chorioptes bovis infestation?
What is used to treat Chorioptes bovis?
No licensed product - fipronil
Apart from fipronil, how can Chorioptes bovis infestation be reduced?
Use antiseptic cream and hibiscrub on scabs
What class and order are lice?
Lice are obligatory parasites. What does this mean?
Die within days without host
What are the 2 suborders of lice?
Mallophaga - biting/chewing, feed on skin/scales
Anoplura - sucking, feed on blood
Do lice have wings? Describe their morphology
Flat wingless insects
Claws to cling onto fur/feathers/hair
What is the lifespan of of adult lice? How many eggs can they lay during this time?
How long does it take for a lice nymph to hatch from the egg? What is a louse egg called?
How long is the lifecycle of a louse?
What is the word for lice infestation? What does it cause?
Irritation, pruritis, dermatitis, lack of weight gain
What can be used to treat lice in horses?
Synthetic pyrethroids (permethrin, cypermethrin - also used for equine flies)
What are the advantages of SP for treatment of flies and lice? What should you be aware of?
Slowly metabolised and eliminated
Low mammalian toxicity
Dangerous to fish/crustaceans - careful disposal
Toxic to cats!
Give an example of a Mallophaga (chewing) and an Anoplura (sucking) louse found on horses
Mallophaga - Bovicola equi
Anoplura - Haematopinus asini
Describe the morphology of Haematopinus asini
Sucking mouthpart (long)
Large mite (5mm)
Yellow/brown with dark margins on abdomen - dragon fruit
Describe the morphology of Bovicola equi
Flat head - chewing mouthpart
Where are equine lice most commonly found?
Base of tail and mane (hair
When are equine lice usually seen?
Winter/Spring - thick coats or wearing a rug
Populations diminish as shed Winter coat and more light