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Flashcards in Sheep blowflies and ticks Deck (31)
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1

What is myiasis?

Infestation of organ/tissues by the larvae of dipteran flies (in family oestridae)

2

What are 3 examples of myiasis species (family Oestridae)

Hypoderma spp
Gasterophilus
Oestrus ovis

3

What is the species of the blowfly?

Lucilia sericata

4

Are blowflies (Lucilia sericata) facultative or obligatory myiasis? What can they initiate?

Facultative cutaneous myiasis
Can initiate flystrike

5

What are the morphological features of adult blowflies (Lucilia sericata)?

Dorsal bristles
Blue green metallic body

6

What are the morphological features of Lucilia sericata?

Smooth segmented worms (Freaky!)
Anterior oral hooks containing enzymes for feeding
Rear end has breathing spiracles

7

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

8

Do blowflies cause wool loss? What do they cause?

No wool loss
Sheep nibble at wool = dark and oily

9

What is the species that is Bluebottles?

Calliphora vicina

10

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

11

What is flystrike?

Infestation of sheep by Lucilia sericata (blowflies) and Calliphora vicina (bluebottles)

12

What species are affected by flystrike?

Sheep
Rabbits
Birds

13

When are animals particularly susceptive to flystrike?

If debilitated, dirty or wounded (disease)

14

What does flystrike cause in sheep?

Anorexia, dullness, isolation, pyrexia, tachycardia, loss of condition and appetite

15

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

16

What part of the body does flystrike mainly affect?

Body
Tail
Penile sheath
Foot
Rump
Horns

17

What host factors affect flystrike?

Skin folds
Wool length/thickness
Scour
Tail length - dock
Wounds - treat footrot

18

What environmental factors affect flystrike?

Warm weather
Summer rain
Abundance of blowflies

19

What can be used to prevent flystrike in sheep?

Diazinon dips
Cypermethrin
Cyromazine

20

What is an advantage and disadvantage of using cyromazine to treat flystrike?

Advantage -doesn't damage host tissues
Disadvantages - not an adulticidal or ovicidal

21

What can be used to treat flystrike in rabbits?

Cyromazine
Permethrin

22

What is the name of the nasal bot fly in sheep?

Oestrus ovis

23

Do oestrus ovis produce eggs? How do they produce osspring?

Larviparous - deposit larvae not eggs

24

When are nasal bot flies (oestrus ovis) most active?

July
Larvae ecdysis happens over winter and spring

25

What are the morphological features of oestrus ovis?

Dark greyish speckled body, segmented
Vestigial mouthparts

26

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

27

How is oestrus ovis (nasal bot fly) diagnosed? How is it controlled?

Clinical signs
Ivermectin

28

What are the welfare issues associated with nasal bot flies?

Nasal discharge
Sneezing
False gid (bot migrates to brain)
Scrapie - affects nervous systems

29

What species are affected by Nasal bot fly (oestrus ovis)

Mainly sheep
Can be humans and other animals

30

What is the most common tick in sheep?

Ixodes ricinus