Difference between revisions of "Oestrus ovis"
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| − | + | *Also known as the sheep nasal bot fly | |
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| − | Also known as | ||
| − | + | *Larvae parasitise the nasal chambers of sheep and goats | |
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| − | + | *Found in most sheep rearing areas of the world | |
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| − | + | '''Recognition''' | |
| + | *13-15mm long | ||
| − | + | *Grey colouring | |
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| − | + | *Black spots on abdomen | |
| − | + | *Clear wings | |
| − | + | *Larvae have distinct black bands on each body segment | |
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| − | + | '''Life cycle''' | |
| + | *Larvae are squirted into the nostrils of sheep in a jet of liquid by the adult fly | ||
| − | + | *The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature before returning to the nostrils | |
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| + | *Larval development takes up to 2 months | ||
| + | **Larvae can overwinter in the nasal cavity if deposited late in the summer | ||
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| + | *Once the larvae have developed they are sneezed out and pupate on the ground | ||
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| + | *The adult fly emerges 1 months later | ||
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| + | *Adult flies only live for 2-3 weeks | ||
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| + | '''Pathogenesis''' | ||
| + | *Adult flies cause annoyance | ||
| + | **Interrupts feeding | ||
| + | **Leads to a decreased weight gain | ||
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| + | *Larvae cause nasal irritation, nasal discharge and sneezing | ||
| + | **Irritate the nasal mucosa with oral hooks and spines causing a viscous exudate to be produced from which they feed | ||
| + | **Heavy infestations lead to erosion of the bones in the sinuses (turbinate bones) | ||
| + | **Penetration of the brain leads to '''false gid''' (high stepping gait and incoordination) | ||
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| + | *[[Respiratory Parasitic Infections - Pathology#Oestrus ovis|Pathology in the nasal cavity]] | ||
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| + | '''Control''' | ||
| + | *Systemic [[Ectoparasiticides|insecticides]] can be used in heavy infestations | ||
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| + | *In warmer countries, strategic prophylactic treatment can be used | ||
[[Category:Oestridae]] | [[Category:Oestridae]] | ||
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Revision as of 13:24, 5 April 2010
- Also known as the sheep nasal bot fly
- Larvae parasitise the nasal chambers of sheep and goats
- Found in most sheep rearing areas of the world
Recognition
- 13-15mm long
- Grey colouring
- Black spots on abdomen
- Clear wings
- Larvae have distinct black bands on each body segment
Life cycle
- Larvae are squirted into the nostrils of sheep in a jet of liquid by the adult fly
- The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature before returning to the nostrils
- Larval development takes up to 2 months
- Larvae can overwinter in the nasal cavity if deposited late in the summer
- Once the larvae have developed they are sneezed out and pupate on the ground
- The adult fly emerges 1 months later
- Adult flies only live for 2-3 weeks
Pathogenesis
- Adult flies cause annoyance
- Interrupts feeding
- Leads to a decreased weight gain
- Larvae cause nasal irritation, nasal discharge and sneezing
- Irritate the nasal mucosa with oral hooks and spines causing a viscous exudate to be produced from which they feed
- Heavy infestations lead to erosion of the bones in the sinuses (turbinate bones)
- Penetration of the brain leads to false gid (high stepping gait and incoordination)
Control
- Systemic insecticides can be used in heavy infestations
- In warmer countries, strategic prophylactic treatment can be used