Using Worming Treatments At Grass
16 March 2017
If using long-acting wormers in calves at grass over the summer, it is worth knowing how long the products persist for. It is important to remember that lungworm is generally seen in late summer and autumn, when spring-born calves are eating enough grass to be at risk, and anthelmintic treatments may not be protective.
The table below gives a guide as to how long products will persist as. These can change, so always consult the data sheet before administering the product.
| Product | Persistence |
| Autoworm Finisher 6250 mg Pulsatile-Release Intraruminal Device (oxfendazole) | 15 weeks |
| Autoworm First Grazer 8750 mg Pulsatile-Release Intraruminal Device (oxfendazole) | 21 weeks |
| Panacur Bolus 12 g, Continuous Release Intraruminal Device (fenbendazole) | 140 days |
| Some pour-on ivermectins, such as Animec pour-on 0.5%; Bimectin 5 mg/ml Pour-on Solution for Cattle (UK) and Ecomectin 5 mg/ml Pour-on Solution for Cattle | 14-21 days for stomach and intestinal worms depending on species; 28 days for lungworm |
| Some pour-on ivermectins, such as Enovex 0.5% w/v pour-on solution for cattle, Ivomec classic pour-on for cattle | 0-21 days for stomach and intestinal worms depending on species; 28 days for lungworm |
| Some injectible ivermectin products, such as Ivomec classic injection for sheep and cattle, Norofas solution for injection | 14-21 days for stomach and intestinal worms depending on species; 28 days for lungworm |
| Some injectable ivermectin products, such as Ecomectin 10 mg/ml Solution for Injection and Qualimec 10mg/ml Solution for Injection | 7-14 days for stomach and intestinal worms depending on species; 28 days for lungworm |
| Pour-on moxidection, such as Cydectin 0.5% pour-on for cattle and Zermex 0.5% w/v Pour-On Solution for Cattle | 5 weeks for Ostertagia ostertagi and 6 weeks for lungworm |
| Injectible moxidectin, such as Cydectin 10% LA for cattle and Zermex 100 mg/ml LA Solution for Injection for Cattle | 90 to 150 days for stomach and intestinal worms depending on species, 120 days for lungworm |
| Injectible doramectin, such as Dectomax 10 mg/ml Solution for Injection for Cattle and Sheep | 21 to 35 days for stomach and intestinal worms depending on species, 35 days for lungworm |
| Pour-on doramectin, such as Dectomax 5 mg/ml Pour-On Solution for Cattle | 21 to 35 days for stomach and intestinal worms depending on species, 42 days for lungworm |
| Pour-on eprinomectin products, such as EPRINEX Pour-On for Beef and Dairy Cattle and Eprizero 5mg/ml Pour-On Solution for Beef and Dairy Cattle | 14-21 days for stomach and intestinal worms depending on species; 28 days for lungworm |
For a fuller list of products, please consult http://www.vmd.defra.gov.uk/ProductInformationDatabase or the COWS website at http://www.cattleparasites.org.uk.
Katrina Henderson, katrina.henderson@sac.co.uk
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