Gastro-intestinal worms are picked up by grazing cattle and can impact directly on cattle health, productivity and, ultimately, profitability.
Infection with gastrointestinal worms can lead to a condition known as parasitic gastroenteritis (PGE) in all ages of cattle but with first-season grazing calves being highly susceptible. Severe PGE is characterised by signs such as loss of appetite, weight loss and diarrhoea, which in some circumstances can lead to death. However, in most cases of PGE, only occurs as a subclinical infection which is seen with livestock performance well below full potential.
Susceptibility to parasite infections is influence by a wide range of factors, including; age of animals, calving times, pasture management, previous grazing history and exposure to parasites. Control of gutworms is therefore dependent on the system (dairy or beef) but is best achieved through pasture management, nutrition and careful use of anthelmintics (wormers).
Anthelmintics (wormers) are one of the major control option available for the treatment of gastro-intestinal roundworms; however, the worms are developing resistance to some of these anthelmintics.
The financial cost of PGE in cattle is however difficult to calculate. Costs include treatment, increase in labour to administer the treatment as well as overall animal health and production losses.
The principal parasite species involved in parasitic gastroenteritis in cattle are:
|Scientific name||Common name|
|Ostertagia ostertagi||Brown stomach worm|
|Cooperia oncophora||No common name|
|Haemonchus species||Barbers’ pole worm|
|Nematodirus species||Thread necked worm|
Ostertagia ostertagi and Cooperia oncophora are the most common species to infect cattle in the UK. Ostertagia ostertagi live in the stomach whilst Cooperia oncophora is an intestinal species.
Watch our short animated film, War of the Worms, which highlights the important elements involved in the development and spread of anthelmintic resistance as well as the crucial messages on sustainable methods of worm control.
Current interests and future aims:
For further Information about Parasitic Roundworms in Cattle please see Moredun Newssheet 5.18 - Treatment Strategies to Control Parasitic Roundworms:
NADIS publishes a monthly Parasite Forecast for farmers and livestock keepers, based on detailed Met Office data. The Parasite Forecast outlines the parasitic challenge facing cattle and sheep in the different UK regions.
Control of Cattle Parasites Sustainably (COWS) is an industry stakeholder group which aims to promote best practice in the control of cattle parasites. It has a wealth of free information for vets, SQPs and farmers about how to control parasitic gut worms and liver fluke in cows. For more information - visit the COWS website