Difference between revisions of "Oestrus ovis"
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| − | {{ | + | {{unfinished}} |
| − | {{ | + | |
| − | | | + | {| cellpadding="10" cellspacing="0" border="1" |
| − | | | + | | Also known as: |
| − | | | + | | Sheep nasal bot fly |
| − | | | + | |- |
| − | | | + | |} |
| − | | | + | |
| − | | | + | '''Scientific Classification''' |
| − | | | + | |
| − | | | + | {| cellpadding="10" cellspacing="0" border="1" |
| − | | | + | | Kingdom |
| − | | | + | | Animalia |
| − | } | + | |- |
| − | + | | Phylum | |
| + | | Arthropoda | ||
| + | |- | ||
| + | | Class | ||
| + | | Insecta | ||
| + | |- | ||
| + | | Order | ||
| + | | Diptera | ||
| + | |- | ||
| + | | Family | ||
| + | | Oestridae | ||
| + | |} | ||
==Hosts== | ==Hosts== | ||
| − | ''Oestrus ovis'' | + | ''Oestrus ovis'' is primarily seen on sheep and goats, but occasionally seen in ibex, camels and humans. |
| − | ==Identification== | + | ===Identification=== |
The adult fly is 13-15mm in length and grey in colour, with black spots along the abdomen. | The adult fly is 13-15mm in length and grey in colour, with black spots along the abdomen. | ||
| − | Mature larvae are around 30mm and are yellow in colour. They have distinct black bands | + | Mature larvae are around 30mm and are yellow in colour. They have distinct black bands the dorsal body segement. |
| − | + | ||
| + | '''Life cycle''' | ||
The female is viviparous and infects the host by squirting larvae into the nostrils of sheep in a jet of liquid. | The female is viviparous and infects the host by squirting larvae into the nostrils of sheep in a jet of liquid. | ||
| − | The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature, before returning to the nostrils. The | + | The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature, before returning to the nostrils. The L2 |
| + | |||
| + | *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) | ||
| + | |||
| + | *[[Respiratory Parasitic Infections - Pathology#Oestrus ovis|Pathology in the nasal cavity]] | ||
| + | |||
| − | + | '''Control''' | |
| + | *Systemic [[Ectoparasiticides|insecticides]] can be used in heavy infestations | ||
| − | + | *In warmer countries, strategic prophylactic treatment can be used | |
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | + | *Larvae in the [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|nasal cavity]] of sheep and goats = Nasal bots | |
| + | *Causes reaction in [[Paranasal Sinuses Inflammatory - Pathology#Sinusitis|sinuses]] | ||
| + | [[Media:Oestrus ovis.mp4]] | ||
| − | |||
[[Category:Oestridae]] | [[Category:Oestridae]] | ||
| − | [[Category: | + | [[Category:To_Do_-_Max]] |
| − | |||
Revision as of 20:21, 17 July 2010
 |
This article is still under construction. |
| Also known as: | Sheep nasal bot fly |
Scientific Classification
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Class | Insecta |
| Order | Diptera |
| Family | Oestridae |
Hosts
Oestrus ovis is primarily seen on sheep and goats, but occasionally seen in ibex, camels and humans.
Identification
The adult fly is 13-15mm in length and grey in colour, with black spots along the abdomen.
Mature larvae are around 30mm and are yellow in colour. They have distinct black bands the dorsal body segement.
Life cycle
The female is viviparous and infects the host by squirting larvae into the nostrils of sheep in a jet of liquid.
The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature, before returning to the nostrils. The L2
- 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
- Larvae in the nasal cavity of sheep and goats = Nasal bots
- Causes reaction in sinuses