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Created page with '*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 lon…'
*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)
*[[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
[[Category:Parasites]][[Category:Flies]][[Category:Myiasis_Producing_Flies]]
*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)
*[[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
[[Category:Parasites]][[Category:Flies]][[Category:Myiasis_Producing_Flies]]