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Blow flies (Lucila Cuprina) (Epidemiology (Climate (Wet conditions (micro…
Blow flies (Lucila Cuprina)
Life Cycle
1.Adult fly lays eggs on sheep
Eggs hatch into First stage larva (maggots)
Drop into environment and forms a pupae
May remain as a pupae for months until preferable conditions (Warm/Moist)
Develop into flies and seek a host to lay their eggs on
(Can be a primary strike or secondary strike)
requires no wind
cant travel long distances
Source protein from skin on animal
Attractants on sheep required
Requires a protein feed
Moisture
Lays 2 -3 batches of 50 - 250 eggs
Epidemiology
Attractants
Dags
Predisposed in wrinkled wool
Wrinkles maintain moisture
Provide environment away from sunlight
Wrinkled sheep cut more wool economic balancing act
Predisposed if diarrhoea (worm burden)
Dermatitis
Fleece rot
Range of bacteria
Lumpy wool
Dermatophilus congolensis
Cuts and wounds
Shearing cuts
reduce wool therefore reduce risk
however infected wounds become attractants
Climate
Wet conditions
micro environment created by diarrhoea
Rain
warm
Not windy (makes it hard for flies to reach target)
Usually spring summer
Treatment/Prevention
Treatment
Shear good margins around effected area and remove wool as to not contaminate environment
Leave to dry and apply chemical to kill maggots and repel flies
Managment
Some chemicals contain insect growth regulators and target the lifecycle of the insects
Consider costs and effective method
Just kill maggots on sheep at time $0.50
Long acting $1.50
Mulesing
Methods
Clips -> not commercially viable
Intradermal injections -> Death of hair follicle -> may have to give multiple injections
Accredited mulesing operaters
tri-solfen -> Analgesia for mulesing -> application on wound -> provides analgesia for a few days
Buccalgesic -> rapid onset longer acting -> oral administration
Genetic selection