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Information on Worms in Calves

Worms in Calves and Cattle Youngstock

Worms will cause problems in calves, young cattle and even sometimes older cows if steps are not taken to control them.


Control is ideally obtained through a combination of pasture management, if practical, and using wormer drugs (anthelmintics) such as Bimectin, Dectomax, Ivermectin (eg Noromectin), and Closamectin.

These drugs are available in injection and/or pour-on formulations.

Other drugs are available and may be more suitable, subject to veterinary advice.

From Vet.Record March 28, 2015

In the UK, in dairy cattle, the choice of drugs is limited to albendazole and oxyclozanide (milk withhold 60 hours & 72 hours respectively), with neither drug being claimed to be effective against flukes in animals below seven to 10 weeks of age. Triclabendazole can be applied to cattle at dry-off (e.g. Endofluke milk withhold 45 days dry plus 48 hours)

In beef calves treated housing, shedding of fluke eggs was monitored. It took 8 weeks following Clorsulon, 13 weeks following nitroxynil , for eggs to reappear in the dung. In this trial, eggs did not reappear in the triclabendazole treated calves.

Other drugs may be used and may be more applicable. e.g. Closantel in Closamectin.

Please click here for a full list of Calf Health Problems and if there’s anything your not sure about, give our experts a call on 01772 690131.