|dc.description.abstract||Intensification in beef units involves significantly increasing the number of cattle being farmed
per hectare, in a controlled situation, so that feed requirements are calculated and provided at
specific levels to maximize the conversion of dry matter into beef at the most critical and
Internal parasitism reduces the appetite of animals, decreasing grass harvest, in addition, protein
and energy are diverted into providing an immune response or to facilitate recovery. This
diversion of protein and energy reduces the daily weight gain per head, and so is uneconomic in
Control of internal parasitism generally revolves around nutrition and anthelmintics (drenches).
Continued use of macrocyclic lactones in particular (endectocides, e.g. Ivermectin, abamectin,
moxidectin, eprinomectin, doramectin) in forms that have not provided adequate control of the
full range of parasites has effectively screened the population on some farms, resulting in an
increase in the number of inefficacy or resistance problems around, and a decrease in the
productivity of affected farms.
There are options to identifY and manage this problem, but a survey conducted by the author
revealed that farmer awareness of the issues is not high.
The report recommends that farmers monitor the performance of all drenches on their farms, and
cautions against relying on label claims and advertising. It suggests that effective quarantine
drenching policies must be adopted, and outlines the risks of importing drench resistance onto
It also outlines some monitoring and drenching strategies that are designed to minimize the risk of
developing drench resistance, or manage the presence of it, and options for keeping drench
expenditure to a minimum, as a way of increasing profitability.||en