Control Of Worms Sustainably (COWS) Manual

Published 19 May 10

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Endoparasites can cause a wide variety of clinical signs depending on the species involved but all cause general loss in production, decrease in fertility and poor growth rates.

In comparison to the sheep industry, there have been few reported episodes in the published literature on anthelmintic resistance in cattle.

Surveillance data from various sources indicates that Ostertagia ostertagi (brown stomach worm) is the main parasite associated with disease and Cooperia spp. (Cooper's worm) are very common in young cattle in their first grazing season and the main contributor to faecal worm egg counts particularly where treatment failures are suspected.  

Dictycaulis viviparous (Lungworm) has been increasingly reported in first year grazing calves. Infections due to Fasciola hepatica (liver fluke) may cause a loss in production in milking cows during the winter and can be clinically difficult to detect. The areas where fluke have been diagnosed are increasing in the UK and this may be problem in other countries where grazing is practiced.