60 
INSTRUCTIONS FOR JETTING 
FOR BLOW-FLY PREVENTION 
THE RACE 
The majority of sheds have a spacious sweating 
pen. It is generally divided by a partition down the 
centre, the entrance ramp serving both sides. It is 
a comparatively simple matter to construct a tem- 
porary race by utilising the permanent partition as 
one side, and using low hurdles to form the other, 
The race can be from 20 ft. to 60 ft. in length, 60 ft 
for preference, if two leads of hose are to be worked. 
The width of the race should be 2 ft. 6in., and the 
height on the side near the operator 2 ft. 9 in., while 
‘the other side can be 3 ft. high. The side near the 
operator should be made of sheets of corrugated iron 
if possible to protect the legs of the operator from 
the dip fluid. The floor of the race will, of course, be 
the battens of the sweating pen This temporary 
гасе can be removed in a couple of hours, when the 
shed is required for shearing. 
The sheep are brought into the side of sweating pen 
away from the jetting plant, and are worked into the 
гасе as required. The race should only be three parts 
full, so that the sheep can stand loose The operator 
stands outside the race. It is not necessary to have 
an assistant in the race, as it is nota difficult matter for 
the operator to jet every sheep just where necessary, 
MIXING THE DIP 
In addition to the vat which contains the dip 
mixed at the required strength, there should be, close 
handy, an open tank of convenient size to hold clean 
water for mixing purposes. This tank should be 
connected with the rainwater tank outside the shed. 
Only rain water or good soft water should be used. 
Hard water seriously depreciates the results of jetting, 
and if nothing but hard water is available, washing 
