Flashcards in Sheep blowflies and ticks Deck (31)
What is myiasis?
Infestation of organ/tissues by the larvae of dipteran flies (in family oestridae)
What are 3 examples of myiasis species (family Oestridae)
What is the species of the blowfly?
Are blowflies (Lucilia sericata) facultative or obligatory myiasis? What can they initiate?
Facultative cutaneous myiasis
Can initiate flystrike
What are the morphological features of adult blowflies (Lucilia sericata)?
Blue green metallic body
What are the morphological features of Lucilia sericata?
Smooth segmented worms (Freaky!)
Anterior oral hooks containing enzymes for feeding
Rear end has breathing spiracles
What is the lifecycle of blowflies? (Lucilia sericata)
L1 hatch and moult to L2 and L3, feeding on tissue
L3 fall to ground to pupate
Do blowflies cause wool loss? What do they cause?
No wool loss
Sheep nibble at wool = dark and oily
What is the species that is Bluebottles?
What is the difference between primary and secondary species of flystrike?
Primary - initiate strike e.g. blowflies
Secondary - cannot initiate strike, e.g. Calliphora vicina
What is flystrike?
Infestation of sheep by Lucilia sericata (blowflies) and Calliphora vicina (bluebottles)
What species are affected by flystrike?
When are animals particularly susceptive to flystrike?
If debilitated, dirty or wounded (disease)
What does flystrike cause in sheep?
Anorexia, dullness, isolation, pyrexia, tachycardia, loss of condition and appetite
Describe the lifecycle of the flies that cause flystrike
Larvae spend 3-4 days on host and cause rapid tissue damage (life threatening)
Flies breed in rotting flesh
What part of the body does flystrike mainly affect?
What host factors affect flystrike?
Tail length - dock
Wounds - treat footrot
What environmental factors affect flystrike?
Abundance of blowflies
What can be used to prevent flystrike in sheep?
What is an advantage and disadvantage of using cyromazine to treat flystrike?
Advantage -doesn't damage host tissues
Disadvantages - not an adulticidal or ovicidal
What can be used to treat flystrike in rabbits?
What is the name of the nasal bot fly in sheep?
Do oestrus ovis produce eggs? How do they produce osspring?
Larviparous - deposit larvae not eggs
When are nasal bot flies (oestrus ovis) most active?
Larvae ecdysis happens over winter and spring
What are the morphological features of oestrus ovis?
Dark greyish speckled body, segmented
Describe the pathogenesis of oestrus ovis?
Adult fly lays larvae in nose
Larvae feed in nasal passages and sinuses
Moult to L2 in nasal passage, moult to L3 in sinuses
L3 move to nostrils and sneezed out
Purpariate on ground and fly emerges 3-8 weeks later
How is oestrus ovis (nasal bot fly) diagnosed? How is it controlled?
What are the welfare issues associated with nasal bot flies?
False gid (bot migrates to brain)
Scrapie - affects nervous systems
What species are affected by Nasal bot fly (oestrus ovis)
Can be humans and other animals