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Quickly applies blowfly prevention to sheep.

Automatic Sheep Jetting Race (AJR)
Built to NSW DPI recommended design principles as a result of research work carried out at the Trangie Agricultural Research Centre


Jetting is the application of a liquid substance to the outer body of a sheep to kill external parasites actually present on the sheep or as a residual treatment to deter parasite infection. Blowfly strike is the main target and the greatest threat to the life of a sheep. Once struck a sheep may only live days if not detected and treated, suffering a painful, slow death. Prevention is better than cure. The best way to apply the life saving pesticide is with a weak mixture of water. Effective jetting is only achieved by penetrating the wool on a sheep and wetting to skin level in those areas on the body most likely to be affected by fly strike, i.e. the poll (head), the shoulders, back, rump and crutch area and the pizzle area on male sheep.

The AJR is a machine which when connected to a water based pressure source and has sheep passing through it, applies the pesticide to the body of each sheep as required by the above description. It is a quick and efficient way to treat large numbers of sheep. There have been many different kinds of jetting races built and used in the past all achieving various degrees of efficiency. Research has discovered many inefficiencies in performance and effectiveness of some older designs.


Effective wetting is best achieved by arranging spray nozzles so that the target areas of fleece are sprayed more than once. This is achieved by positioning multiple nozzles in line with the sheep flow.

Good penetration is only achieved with a solid stream. Streams which break into droplets are less effective. Fan, cone nozzles or small diameter solid stream types under high pressure should not be used. Spray height is important. The further the nozzles are away from the fleece, the more the stream will break up and become less effective. The height of the spray bars in the JetEzy can be quickly adjusted by a simple vertical slide, to suit the size of the sheep in the mob. The closer the spray bars the more effective the application will become. The lateral position of the top spray bars can also be adjusted.

As each sheep enters the machine it breaks an invisible beam created by a sensor mounted in a track in the side wall. This instantly activates the water blast through all the jets. When the sheep pass by the sensor the water blast is instantly stopped. The sensor, which is magnetically secured in the track, can be placed at any point along the track. This provides precise activation at the optimum moment so the target area is hit as the sheep passes through.

Sufficient volume needs to be retained in the fleece so that some jetting fluid runs around the body of the sheep at skin level. Less than optimum volumes will only partially wet the sheep. Two to five litres may need to be retained by each sheep depending on the product used, wool length, sheep size and breed.

Jetting, as with many other husbandry operations should not be a "race" against time, speed of sheep through the JetEzy should allow enough time for the correct volume of spray to be applied to each sheep. Good lead-up and exit systems play an important role here. A dual race system with an 8 foot non back lead-up race will normally supply a smooth flow of sheep to the jetter. An exit race is beneficial for slowing sheep down after they leave the machine and to create a “draw” for incoming sheep retaining a smooth even flow. Correct adjustment of the internal guide rails to suit sheep size is also important.

Large size, all non-corrosive fittings are used on the JetEzy. A large electric valve activates the flow when opened as each sheep passes through. An air loaded pressure cylinder, with pressure gauge fitted, is used to maximize spray performance through dampening the intermittent operation, it also produces an instant flow when required at each opening of the valve.

The JetEzy is mounted on a low flat open top tank base with a capacity of approx. 200 litres. Any wasted spray which occurs as each sheep passes through is captured in the tank and can be used again. The 40mm outlet is fitted with a mesh filter.

The pump pressure is determined by the nozzles and the pipe pressure loss, the flow rate is determined by the number and size of nozzles and the sheep speed through the JetEzy. Up to five litres of jetting fluid may be needed to be applied to each sheep if they are in 3/4 to full wool (see recommended application rates of the chemical being used). The recommended flow and pressure required is 6 litres per second at 550 kPa, this means an 8 HP twin impeller centrifugal pump, however excellent results have been achieved with a normal 5-6 HP firefighter.

The JetEzy is more effective than most existing machines and is capable of providing longer protection from fly strike which means fewer repeat treatments, this results in savings in operator labour and mustering time. Very importantly, fewer treatments also results in lower contamination residues in the wool at shearing time.

Large solid stream spray nozzles operating at lower pressures and a fully enclosed top reduce spray drift, which significantly reduces the risk to the operators of pesticide exposure.

1. Two in-line top spray bars each with five large diameter solid stream brass jets. The bars are adjustable vertically for clearance above the sheep, horizontally length ways so that the the sheep is in the correct position when the flow begins, plus each bar can be rotated to achieve the correct stream entry angle into the fleece along the back line.
2. Single bottom spray bar with three large brass solid stream jets with angle adjustment. Can be turned off with a ball valve if not required.
3. Extra large diameter plumbing and fittings, all non-corrosive to provide maximum flow.
4. Air chamber with gauge, large quick acting electric valve.
5. All galvanized steel construction, sheeted sides and base tank.
6. Adjustable internal side guide rails for correct sheep alignment with the jets.
7. Perforations for drainage in floor with non-slip metal slats.
6. Designed to fit on one pallet, weight 100 Kg. approx.
7. Delicate components totally enclosed for protection.

EXTRA REQUIREMENTS (can be supplied on request)
● A good lead-up and exit system
● A fully charged 12 volt battery
● Suitable centrifugal pump
● Minimum 40 mm suction and delivery hoses
● Chemical mixing tank


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Last modified: 13/02/2013