Equine PGE Flashcards
Which are the large and which are the small strongyles that infect the horse?
LARGE - Strogylus spp. and Triodontophorus spp.
SMALL - Cyathostomins
How can their morphology be described, both grossly and microscopically?
Large (1.5-5cm)
Bursae visible with naked eye
Lage buccal capsule
Buccal capsule contains:
Leaf crowns
Teeth (not all)
Dorsal gutter (for secretions)
Briefly describe the life cycles of :
a) S. vulgaris
b) S. edentatus
c) S. equinus
d) triodontophorus
a) Travels to anterior mesenteric artery. PPP - 6-7 months b)Liver, PPP - 11-12 months c)Liver, PPP - 9 months d)Wall of intestine, PPP - 2-3 months
Why are the adult worms pathogenic and how do the genera differ?
They are plug feeders. Triodontophorus have a smaller buccal cavity but often feed in “herds”.
How does the life cycle of the Cyathostomins differ to that of the large strongyles?
It is confined to the gut wall and the PPP is much shorter at 8-12 weeks.
Briefly describe their pathogenicity.
:Larvae emerge throughout summer/autumn and are plug feeders. Often their are a lot of worms!
Previously arrested larvae can suddenly emerge in late winter/early spring causing severe disease.
What age of animals are most commonly affected by Parascaris infection?
Very young foals especially <6months.
How can they be recognised?
VERY LARGE (50cm long) and have 3 large lips around the mouth.
What is the infective stage?
An embryonated egg.
What is the migratory path of the larvae and the PPP?
Liver-heart-lungs-intestine. 10-12 weeks.
How are the eggs suited to transmission and survival?
They are very thick unembryonated eggs and stickness allows them to stick to and transfer between animals.
What are the main thoughts towards control?
Regular anthelmintic treatment as well as clearing faeces from pasture.
How can Strongyloides westeri be recognised?
They have a long oesophagus.
What is the PPP?
1 week.
How are foals infected?
By ingesting infected milk or eating infected grass.
