Most prevalent worm genus/type across Australia and causes slow growth and lack of appetite. Different species of this worm occur in tropical and temperate regions
Cooperia spp. are the dose-limiting genera (i.e. hardest to kill) for all cattle drenches
Damages the lining of the small intestine, affecting nutrient absorption, fluid loss and mucous secretion
Usually appears as a mixed infection with other worm species, where it can magnify the damaging effects of the other species
Causes most problems in young calves as adults usually develop protective immunity.