Sheep parasitology Flashcards
(29 cards)
Haemonchus contortus- adults or lambs?
Both
what stage of the worm lifecycle is inside the host?
L3- L4
Which stage of the worm cycle is ingested by the sheep?
L3
Trichostrongylus- adults or lambs?
lambs only
Adult sheep have good immunity to Teladorsagia, trichostrongylus but not …
haemonchus contortus
Cx of trichonstrongylus spp in sheep (4)
- diarrhoea
- ill-thrift
- sudden death!
- weight loss
Which drench has the most resistance?
white
Which drenches have the least resistance?
purple and orange
Clinical signs of haemonchus contortus
- anemia
- bottle jaw
- sudden death
- exercise intolerance
Treatment of haemonchus
- broad spec wormers ie Closantel
- Clinical signs of nematodirus Battus
- severe scours
- death
- stunting growth
Nematodirus only causes disease in ….
young sheep (adults are resistant)
Nematodirus is different from other worms, in that the infective stage is when the larva is in ….
the egg
Before Nematodirus eggs can hatch, the eggs have to undergo a period of …. followed by … temperatures
cold/ warmer
Does trichostrongyles require an intermediate host?
No
What is the IH of the fluke?
snail
liver fluke cycle lasts in total
18-20 weeks
What part of the liver fluke cycle is ingested by the sheep?
the metacercaria
3 clinical forms of liver fluke
acute
subacute
chronic
most flukicides only kill…
adult flukes not immature flukes
Psoroptes ovis lifecycle lasts how many days?
14days
What is the lifecycle of psoroptes ovis
- egg—> larva—> nymph—> adult
what does epg stand for
eggs per gram
