Drench resistance is generally regarded as the most economically important sheep health problem in Australia today with an estimated 90% or more farms experiencing the phenomena. There is no sheep drench on the market today that is not affected to some extent. Unless unnecessary drenching is reduced, the cost of drench resistance to the sheep industry alone is estimated in excess of $700 million per annum in the next five years. Less well documented but equally well known are drench resistance problems in other livestock industries.
more »