Parasites are probably the number one growth limiting animal health issue in the district. Our cool winters and sometimes dry summers are enough to halt the hatching of eggs on the pasture but never severe enough to kill off most of the eggs. Spring and autumn can see rapid increases in infective larva on the pasture and outbreaks of clinical parasitism, especially in lambs and calves.
We advocate minimising the use of drenches to avoid resistance issues but this has to be balanced with getting maximum growth rates in our stock. Integrated grazing, cropping rotations and correct timing of drenches are all important.
There is a wide range of drenches on the market and the choice of oral, injectable and pour-on applications. It can be confusing to sift through all the advertising bombardment so the best plan is to discuss the options that best suit your farming operation.