Jetting is a useful tool for applying chemicals to protect sheep during periods of high flystrike risk. It can be done by hand jetting or by using an automatic jetting race.
The table below summarises the advantages and disadvantages of hand jetting and automatic jetting races.
Technique
Advantages
Disadvantages
Hand jetting
With good technique, hand jetting is the most thorough long wool flystrike treatment
Flystrike protection provided by jetting products is likely to be greater when applied by hand jetting
Slow, hard work
Thoroughness of the method declines as the operator tires
Can leave high residues in the fleece
Requires operator to wear good quality, comfortable personal protective equipment
Requires access to water, concrete-floored race and good jetting equipment including pump
Jetting handpieces vary in their efficiencies
Operator must dilute concentrate with water
There is a need to dispose of spent/unused jetting fluid
Automatic jetting race
Faster than hand jetting
Less work for the operator than hand jetting
Removes the need for the operator to stand in the race with the sheep
If set up and operated efficiently it can allow the operator to stand back from the machine thereby reducing exposure to insecticides
Automatic jetting races vary in their efficiencies
Requires access to a properly functioning automatic jetting race and adequate pump
Automatic jetting races need to be set up and adjusted to the size of the sheep
Requires access to water
Can leave higher residues in the fleece than hand jetting
Operator must dilute insecticide concentrate with water
Results in operator exposure to spray when moving stalled sheep
There is a need to dispose of spent/unused jetting fluid
Sickle wand. Source: Garry Levot, NSW DPI.
Dutjet wand. Source: Garry Levot, NSW DPI.
Hand-jetting using a Dutjet wand. Source: Peter James, DEEDI.
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