Sheep ectoparasites Flashcards
What is another name for blowfly strike
cutaneous myiasis
When is the risk period for fly strike
between may and september
Describe the signs seen with blowfly strike
first sign is a patch of discoloured wool and agitation
pruritus
unpleasant smell
Describe the treatment of blowfly strike
application of insecticides (systhetic pyrethroids or organophophate dips)
shearing
cleaning of affected areas
topical antibiotics
NSAIDs
List some ways in which fly strike can be prevented
shearing/ dagging/ tail docking
reducing faecal soiling
organophophate dips, synthetic pyrethroids
What causes sheep scab
Psoroptes ovis
Is a mite
What is pediculosis
lice infestation
List 6 signs of pediculosis
can be asymptomatic
pruritus
excoriation
fleece damage and loss
severe infestations can result in anaemia
can look similar to scab
Describe how pediculosis be diagnosed
visual inspection
direct microscopy of hair samples
What are the treatment options for sheep lice
pour-on synthetic pyrethroid (deltamethrin or cypermethrin)
organo-phosphate dips
which sheep should be treated for sheep lice
all sheep in direct contact
When should sheep be preventatively treated for lice
the start of the winter housing period
Where do ticks spend the majority of their lifecycle
off the host
what is the most common tick of sheep
Ixodes rincus
what diseases can be spread to sheep by ticks
Louping ill
Tickbourne fever
Tick pyaemia
Describe louping ill
viral infection causing encephalomyelitis
is zoonotic
what are the symptoms of louping ill
seizures
paralysis
death
what sheep are most commonly affected by louping ill
weaned lambs
yearlings
describe how louping ill can be controlled
tick control
vaccination can play a role (but not currently avaliable)
What causes tickbourne fever
Anaplasma phagocytophilum
What is tickbourne fever
immunosuppressive disease
bacteria infects and destroys WBC causing leucopaenia
List 5 signs of tickbourne fever
pyrexia
anorexia
depression
pregnant ewes may abort
naive tups may become infertile
What will happen if a naive animal is introduced to a TBF endemic area
more severe signs
what is tick pyaemia
Staphylococcus infection of lambs often following
immunosuppression due to tickborne fever