We are a Royal College of Veterinary Surgeons (RCVS) approved equine hospital.
Parasitic intestinal worms are common. All grazing horses are likely to have worms, but most horses have a low number which have no untoward effects and may do no harm. Problems arise if worm burdens increase, which is when the worms can cause disease such as weight loss, colic and diarrhoea. In some cases, heavy worm burdens can be fatal. So it is important to control the numbers of worms in our horses.
The aim is to maintain a low number of worms in the group of horses rather than no worms at all, because a low worm burden stimulates healthy immunity against further infestations.
In adult horses, the strongyles (small and large redworms) and tapeworms are the most important ones that we need to control.
1. To minimise the contamination of pasture by worm eggs (redworm eggs are passed in the droppings and contaminate the pasture; larvae develop on the grass and are then eaten and infect horses that are grazing).
2. To keep the worm burden in an individual horse low enough to prevent disease.
There are two main components to a worm control programme:
1. Pasture management
2. Drug treatments (“wormers” or “anthelmintics”)
For further information, please see the horse owners booklet on Parasite Control in the 'Health Horses' series by MSD Animal Health.
Heavy use of wormers has caused some equine worms to become resistant to many wormers. To ensure that wormers remain effective, they should be used responsibly and targeted to the horses that need them and will benefit most from them (known as targeted treatment programs).
DO NOT randomly treat horses at frequent fixed intervals year-round. Some wormers can have side effects so they should not be overused. Recent research has shown that targeted treatment usually saves money (an average of nearly £300 per yard per year) when compared with routine treatment of all horses throughout the year.
The ideal strategy varies from yard to yard and should be discussed with BELL EQUINE, please call us on 01622 813700. We may recommend a different approach for different yards with different worming histories. The most important thing is not to over use medication. Only treat when you really need to do so.
A quarantine policy can help prevent worms from spreading between horses. New horses arriving on a yard should be quarantined (suggest 2-3 weeks) before being turned out to pasture with other resident horses.
Horses with an unknown worming history should be treated for encysted redworm and tapeworm using a worming treatment for both types of parasites, e.g. moxidectin and praziquantel such as Equest Pramox®. A faecal worm egg count should then be performed 2 weeks later, if the result is 300 eggs per gram or higher, veterinary advice should be sought.
Horses that have been treated for tapeworm and encysted redworm within the previous year should have a faecal egg count. If the result is 300 eggs per gram or higher, then the horse should be wormed and a faecal egg count reduction test should be performed in order to prevent the introduction of drug-resistant parasites.
1. To minimise the contamination of pasture by worm eggs (redworm eggs are passed in the droppings and contaminate the pasture; larvae develop on the grass and are then eaten and infect horses that are grazing).
2. To keep the worm burden in an individual horse low enough to prevent disease.
1. Pasture management
2. Drug treatments (“wormers” or “anthelmintics”)
1. PASTURE MANAGEMENT
PLEASE ENSURE ALL FOALS RECEIVE WORMERS APPROPRIATE FOR THEIR AGE - ALWAYS CHECK THE INSTRUCTIONS BEFORE ADMINISTERING OR CONTACT BELL EQUINE ON 01622 813700
Every yard is different and specific guidance can be provided by our vets by calling BELL EQUINE on 01622 813700.
PLEASE ENSURE ALL FOALS RECEIVE WORMERS APPROPRIATE FOR THEIR AGE - ALWAYS CHECK THE INSTRUCTIONS BEFORE ADMINISTERING OR CONTACT BELL EQUINE ON 01622 813700 TO DISCUSS BEFORE TREATMENT.
See HERE for the commonly used worming medications and their trade names.
Wormers can come in the form of paste and granules which are both equally effective. Granules are often cheaper and can be added to the feed although fussy feeders may not consume the whole treatment. Paste is usually quick and easy to administer.
WARNING! Moxidectin and ivermectin can have severe adverse affects on dogs and cats. Keep syringes safely and make sure these animals have no access to feeds containing the paste or the droppings of the horse for 3 days after worming.
Wherever possible, administer the paste directly into the horse’s mouth.
WARNING! Moxidectin can also be toxic to horses if overdosed – this is most likely to happen in foals and Shetland ponies or Miniature horses so please take extra care with dosage. We avoid using it in very thin or poor animals, call BELL EQUINE on 01622 813700 to check.
IT IS ADVISEABLE THAT A VET CHECKS THE WORMING PROGRAMME AT LEAST ONCE A YEAR SINCE TREATMENTS, PROCEDURES AND PARASITES CONTINUALLY CHANGE.
Pinworm (Oxyuris Equi) are small white worms that can cause itching of the skin around the horse's dock. Pinworm infections were previously uncommon because the worms were easily controlled with most treatments and seemed to only affect young horses. Recently pinworm infections have become more common, now affecting older horses and are more resistant to some wormers.
Usually only one or two horses in a group are affected. They itch due to the horse's reaction to the worm eggs that are laid on the skin around the dock area. The itching can be unpleasant and is sometimes confused with sweet itch. To confirm the diagnosis we use a microscope to look for signs of the pinworm eggs, having initially collected a sample. Sometimes we see the adult worms in faeces; these are white with a very long, thin tail (pin-shaped) and can be up to 15cm long. Unfortunately, pinworm eggs cannot be seen in faecal worm egg counts.
Treatment requires good hygiene and use of wormers. Daily washing of the affected skin with mild detergent can remove the parasite eggs. Barrier creams such as vaseline can help to prevent new eggs from sticking. Cleaning of the stable or areas that the horse itches against can help remove eggs and reduce re-infection. Some wormers still appear effective but we often treat affected horses more frequently. Some people suggest that wormers should be given directly into the rectum but this is not helpful and can be harmful; the wormers do not stay there for long enough to work and most of the worms live well out of reach further up the colon.
If you think your horse may have a pinworm infection, please contact us for further advice.
It is vital that we continue to use wormers carefully and correctly to prevent more resistance developing in worms
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