The number of positive liver fluke cases is beginning to rise, in line with the statement made by the Control of Worms Sustainably (COWS) and the Sustainable Control of Parasites in Sheep (SCOPS) groups in October that, after a wet, mild summer and autumn, livestock farmers could be facing a high challenge for some areas.
Results of testing and post-mortem examinations in recent weeks suggests liver fluke activity in early autumn was still quite low, but the number of positive cases are now beginning to rise and SCOPS and COWS are urging farmers to keep up with testing to avoid being caught out.
Dr John Graham Brown of the University of Liverpool and National Animal Disease Information Service (NADIS) says the recently updated NADIS forecast confirms the provisional autumn forecast, which predicted a medium to high risk on the west coast, all the way from North Wales up to northern Scotland. However, unpredictable weather patterns mean it is likely snail habitats, and therefore liver fluke, will be more widespread – and the window for infection more prolonged – than in previous dry summers. Therefore, farmers must stay on the guard and keep testing.
Speaking on behalf of SCOPS, independent sheep consultant Lesley Stubbings says: “We are particularly concerned about those farmers who have treated sheep already. Flukicides do not have any residual effect, which means a dose given too early offers no protection if sheep have been put back on to infected pastures. It is vital to establish if fluke is present – so treatment can be given at the right time.” This topic is covered in a new SCOPS podcast, which has been released as a bonus episode in Series 2 of the popular podcast series. More at www.scops.org.uk/podcasts.
Highlighting the importance of testing for cattle and sheep, Dr Philip Skuce of Moredun adds: “The coproantigen test can detect the presence of liver fluke a little earlier than other tests, which is particularly useful when the risk is considered high on a farm. But as we head into December, faecal egg count testing methods are likely to be most appropriate, particularly post-housing.”
Rebecca Mearns of Biobest warns of the potential perils of over-use of flukicides, in particular closantel. She says: “We are concerned about reports that sheep farmers are repeatedly treating sheep with closantel against Haemonchus contortus (the barbers pole worm). Dosing at intervals less than six weeks risks adverse effects in sheep, including blindness. If farmers then also use the same drug to treat liver fluke, the risks of overdose are even higher. This risk is made worse because some producers have assumed they have resistance to triclabendazole, ruling out the use of this flukicide on their farm. Talk to your vet about how you can confirm the position rather than jumping to conclusions.”
Lis King of AHDB is the incoming Chair of the COWS Steering Group. She says: “While less commonly affected by acute disease than sheep, the tendency to leave cattle out for longer as a consequence of milder weather (or even all winter in some systems) could mean longer exposure to liver fluke infection on pasture. Testing is essential to gauge the degree of exposure, with a number of testing options available at or over the winter housing period.”
Find the SCOPS-COWS Guide to Test-Based Liver Fluke Control at www.scops.org.uk/internal-parasites/liver-fluke/diagnosis-and-detection and www.cattleparasites.org.uk/liver-fluke-and-rumen-fluke.
Notes to editors: –
- This press release is issued by National Sheep Association (NSA) on behalf of SCOPS. For more information contact Katie James, NSA Communications Officer, on 07748 151235 or katie@nationalsheep.org.uk.
- SCOPS is an industry-led group that works in the interest of the UK sheep industry. It recognises that, left unchecked, anthelmintic resistance is one of the biggest challenges to the future health and profitability of the sector. More at scops.org.uk.
- COWS is a voluntary initiative aiming to provide the best available, evidence-based information to the beef and dairy cattle industries in relation to the sustainable control of both internal and external parasites. More at cattleparasites.org.uk.