Cows: Control Of Worms Sustainably.

A Technical Manual for Veterinary Surgeons and Advisors - to support specific decisions on an individual farm basis to ensure that wormers are used effectively and responsibly.

Year of Publication2010

A manual for sustainable worm control strategies for cattle.From the Introduction:Anthelmintics are widely used both in the treatment and prevention of parasitic helminth infections of cattle. For cattle there exists a range of application methods that include pour-ons and boluses, as well as more conventional injections and oral drenches. These products can be used in a number of highly successful control and treatment strategies.All of these strategies have proved successful over the last three decades, particularly since the launch of the macrocyclic lactones (ML) class of anthelmintics which now dominate the cattle ‘wormer’ market. Individual product activity and persistence against re-infection varies with the different compounds, and also with the formulation and method of application.Given this wide range of treatments and application methods there is always the potential for incorrect usage resulting in control failure,which may be perceived as anthelmintic resistance (AR). Reports of resistance to anthelmintics in cattle nematodes are relatively uncommon in comparison to reports of nematode resistance in sheep and goats worldwide. Similarly, whilst resistance to all three anthelmintic groups has been reported in sheep and goats in the UK, the situation in cattle appears less problematic.This may be a reflection of the relative frequencies of treatment or of the differences in parasite population dynamics between the different host species. Furthermore, prolonged survivability of susceptible worms in the larger bovine faecal pats may reduce anthelmintic selection pressure by maintaining a large ‘in-refugia’ population.Where AR has been suspected or reported, this has often involved an avermectin and the dose-limiting species Cooperia oncophora. In light of sporadic reports ofAR in cattle nematodes, and in keeping with “The Need for Change” highlighted in the SCOPS Technical Manual for sheep, it seems appropriate to produce a similar technical manual for sustainable worm control strategies in cattle, based around the same basic principles that are applicable to all grazing livestock.

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