decrease font size
increase font size
change type face
bookmark this page
email this page
print this page
TheBeefSite: Diseases and Conditions
Contents of Cattle Diseases and Conditions
Ragwort Poisoning
Many plant poisonings, including ragwort poisoning, are most common in the autumn.
The highest risk period for grazing cattle is when grass growth is poor, or when very
young plants are present in the pasture. However, the greatest risk is to cattle fed
preserved forage, either as silage or as hay, because preserved ragwort is readily eaten but
has lost none of its toxicity.
Ragwort contains a range of related toxins, all of which damage the liver. The more ragwort that is eaten the greater the damage. In cattle most cases of ragwort poisoning occur as a result of eating ragwort over a period of weeks or months but the signs can take up to 18 months to develop.
Clinical Signs
Diarrhoea, with straining, is occasionally seen as is colic - Jaundice – yellowing particularly of the whites of the eye
- Photosensitization – damage to pale areas of skin in response to sunlight
- Swelling under the skin and of the abdomen due to low blood protein
- Some animals will develop brain disease with staggering, circling and head pressing.
Diagnosis
- On the clinical signs described above
- History of access to ragwort – this can sometimes be difficult to confirm as the cattle may have eaten the plants months earlier
- In many cases a post mortem will greatly aid diagnosis
- The University of Liverpool is currently working on a test to detect early signs of exposure to ragwort. However this requires further work before it is availablecommercially
Treatment
- There is no specific antidote for ragwort poisoning.
- No treatment is of much value in affected animals.
- Normal animals in the group should be switched to food that contains no ragwort
Prevention
- Limit access to pastures with ragwort, particularly if grazing is poor. Sheep are more resistant to ragwort so can graze such pastures, provided they are not too heavily contaminated
- Ragwort control by hand-pulling and burning before seeding and the strategic use of herbicide is the best method of prevention.
- Ragwort is one of the five plants covered by the Weeds Act 1959. This does not mean that it is an offence to allow ragwort to grow on your land, but it is an offence not to control ragwort if asked to do so under the act.
- Do not make hay or silage from pastures heavily contaminated with ragwort.
Copyright © NADIS 2002 - 2007
NADIS (National Animal Disease Information Service) is a network of 40 veterinary practices and 6 veterinary colleges monitoring diseases in cattle, sheep and pigs in the UK, including BPEX, EBLEX, HCC, QMS, Elanco Animal Health, MLC and Merial
