Office & Emergency: 0115 989 9411

Email: info@homefarmequine.co.uk

Parasite Control in Horses


Horses can become infected with both ectoparasites (lice and mites) and endoparasites (worms). The effect of a parasite infection on the horse's health depends on the number and type of parasite involved. Generally, the higher the parasite burden, the higher the risk of clinical disease. 

1) MANAGEMENT: reducing the requirement for treatment

·     Stocking management:

o  Reduce stocking density, especially in groups of young horses (these have the highest worm burden)

o  Maintain consistent horse populations (i.e. form groups of horses and stick with them!)

§ Then we use Faecal Egg Counts (FEC) to identify our problem horses

·     Pasture management:

o  Poo pick at least TWICE per week

§ Avoid harrowing as this spreads the worms across the pasture

§ Tape off your dung heap or make sure it is separate from the grazing area

o  Pasture rotation: worms can survive more than 6 months on pasture, so if you rotate pasture then make sure you rest it for at least 6 months

§ Avoid putting youngstock on the same paddocks year on year (alternate with older stock or ruminants to reduce the worm burden in the paddock)

2) DECIDING WHO NEEDS TREATMENT (ADULT HORSES >3yrs):

·     Faecal Egg Worm Counts:

o  These are used to identify HIGH WORM BURDEN HORSES, which require treatment, and the low worm burden horses which don’t need treatment!

§ It is best to perform at least 3 FECs each year approximately 2-3 months apart (between March and September).

·     Tapeworms:

o  Ideally test for tapeworm every 6-12 months – this requires either a saliva or blood sample to be taken.

 

3) TREATMENT (ADULT HORSES >3yrs):

·     During the grazing season (March – September):

o  Treat all horses with an FEC >200 eggs per gram with either a Pyrantel or Ivermectin based wormer

§ Ivermectin based: Eqvalan, Bimectin, noromectin

§ Pyrantel based: Pyratape P, Strongid-P, Bimectin Embotape

o  Try to stick to ONE type of wormer for a whole grazing season. Then switch for the following year.

§ I.e. Ivermectin based for one year, then Pyrantel for the following year,

·     Autumn (September/October):

o  It is important that ALL horses are treated for encysted larval cyathostomes in autumn regardless of FEC.

§ This should be done at least 8 weeks after their last wormer treatment.

o  This requires a Moxidectin based wormer (Equest (green) or Equest Pramox (Combination of Moxidectin & Praziquantel) – ideally avoid using Moxidectin based wormers at other times during the year to stop resistance occurring!

·        TAPEWORM: Requires treatment with Praziquantel or a double dose of a pyrantel based wormer.

o  To integrate this treatment with your other wormers either use a double dose of pyrantel, Praziquantel or use a combination wormer (e.g. Eqvalan Duo Wormer, Noropraz, Equimax, Equest Pramox)

·     Youngstock (1-3yrs)

o  Youngstock (1-3yrs) have much lower immunity to worms than adult horses.

o  You should follow the same advice as given for adult horses, BUT it is all even more important!

§ You should perform FEC more frequently in groups of young horses (ideally every 8 weeks)

§ Poo pick AT LEAST TWICE WEEKLY - Prioritise their paddocks over older horse paddocks!

§ Rotational grazing is even more important in youngstock than adults, as worms will build up more rapidly.

·        Rest paddocks after grazng youngstock, ideally during hot dry weather

§ All youngstock should receive moxidectin and praziquantel in the autumn.

·        If management is poor (i.e. no rotational grazing, no poo picking, high stocking density), they may require a second treatment 3 months later, particularly if they are grazing through the winter.

§ Tapewoerm: Test a saliva or blood sample to see if treatment is necessary (same as for adults)

·     Foals (<1yr)

o  MARES – Manage as described in the adult horse section.

§ BUT if appropriate worming has not been carried out during the gestation period, then as a minimum ensure that the mare is given an Ivermectin or Moxidectin based wormer during the LAST MONTH OF GESTATION

o  Foals can suffer from additional worms to adults, these include:

§ Parascaris Equorum – can cause respiratory disease, and (potentially fatal) colic. Clinical signs in foals are most commonly seen from late summer or early autumn.

§ Strongyloides westeri - rarely a cause of disease, and therefore is only important if there is history of disease on the property.

o  Management:

§ Turn out foals onto clean pasture. AVOID using the same nursery paddocks year-on-year.

o  Treatments: FOALS SHOULD BE WORMED EVERY 3 MONTHS.

§ 3 months old: Fenbendazole (e.g. Panacur)

·        ONLY USE FENBENDAZOLE IN FOALS LESS THAN 6 MONTHS OLD unless directed by a vet.

§ 6 months old (if weaning at this point then give treatment just before weaning):

·        Ideally use a FEC to see if high strongyles or ascarids.

o  If high strongyles then use Ivermectin or Moxidectin* based wormer

o  If high ascraids then use Fenbendazole (Panacur) to treat ascarids only.

§ 9 months & 12 months: an Ivermectin or Moxidectin* based wormer is most appropriate.

o  *Over 6 months: Ivermectin should be used as the first choice wormer, but at least ONE treatment during autumn/early winter should be with a Moxidectin based wormer.

 

Strangles in Horses

by Home Farm Equine • 6 October 2021
SYMPTOMS The typical signs of strangles include: • Sudden high temperature and loss of appetite. • Cough. • Slight yellowy nasal discharge. • Swollen lymph nodes (glands) under the jaw and in the throat: never present in the early stages of the disease. • Rupture of the abscesses in the affected lymph nodes. Horses usually recovered fully and naturally after the rupture of the abscesses. Once the horse has recovered from strangles it usually develops a strong immunity and it is rare for an animal to be affected more than once. If your horse shows any of these symptoms it is important that you contact your vet to help confirm the diagnosis as soon as possible. A blood test and/or nasal swab can be taken to determine if you horse does have strangles. We will then be able to guide and help you with the treatment and management of your horse for their quicker recovery and also to prevent an outbreak of the disease. DIAGNOSIS The time between infection and development of clinical signs varies but it is usually 1 to 2 weeks. Strangles is diagnosed primarily on the clinical signs which may be strongly suggestive of its involvement. Nasal swabs samples can be taken for laboratory investigation. Recently a blood test has been developed which is able to tell us whether the horse has had contact with strangles in the recent past. A negative result for strangles in the swab or the blood do not guarantee that the horse does not have strangles, but these laboratory results together with the symptoms can be very helpful in determining if the horse is affected and which horses may be involved when an outbreak occurs in the yard. Some horses can become carriers, where they do not suffer the disease but they can spread it to other horses.

Pre-Purchase Examinations (Vettings) 2 Stage & 5 Stage

by Home Farm Equine • 6 October 2021
THE EXAMINATION The standard examination is conducted in either two or five stages, although the exact sequence of the examination may vary. If a two stage is required a disclaimer form will need to be signed and returned previous to the vet attending. The stages are: Stage 1: Preliminary examination This is a thorough external examination of the animal at rest using visual observation, palpation and manipulation to detect clinically apparent signs of injury, disease or physical abnormality. It includes an examination of the incisor teeth, a thorough examination of the horse's eyes in a darkened area and auscultation of the horse's heart and lungs at rest. Examination of the eyes does not include dilating the pupil but should include examination of internal and external structures. The examination DOES NOT include examination of the inside of the prepuce (sheath), a detailed mouth examination with a speculum, a height measurement or any examination for pregnancy. Stage 2: Walk and trot, in hand The animal is walked and then trotted in hand to detect abnormalities of gait and action. Ideally this is carried out on firm, level ground. The horse is turned sharply each way and is backed for a few paces. Flexion tests of all four limbs and trotting in a circle on a firm surface may be carried out if the examining veterinary surgeon considers it safe and appropriate to do so. Stage 3: Exercise phase The horse is usually ridden and given sufficient exercise to: Allow assessment of the horse when it has an increased breathing effort and an increased heart rate. 2. Allow assessment of the horse's gait at walk, trot, canter and, if appropriate, gallop. 3. Allow assessment of the horse for the purpose of stage five. If ridden exercise is not possible for any reason then this stage may be conducted by exercising the horse on a lunge, but this fact should be made clear to the purchaser and on the certificate. Stage 4: Period of rest and re-examination The horse is allowed to stand quietly for a period. During this time the respiratory and cardiovascular systems may be monitored as they return to their resting levels. Stage 5: Second trot up The animal is trotted in hand again to look for any signs of strains or injuries made evident by the exercise and rest stages. Flexion tests Flexion tests and trotting in a circle Flexion tests and trotting in a circle on a firm surface are not mandatory parts of the standard procedure, but they can sometimes provide useful additional information about a horse. There may be circumstances when the examining veterinary surgeon concludes that it is unsafe or inappropriate to perform such tests. Blood Sample Blood Sample A blood sample may be taken for storage (usually for 6 months) for possible future analysis to detect substances present in the horse's system at the time of the examination that might have masked any factors affecting the horse's suitability for the purchaser's intended use. If a blood sample is not taken then the reason should be noted on the certificate. Identification Identification of the horse The horse should be identified by recording the horse's markings in the form of a diagram and written description as well as searching for a microchip and inspecting any available documentation. The diagram may be omitted if the presence of a microchip can be confirmed by scanner and the diagram of an accompanying passport matches the horse. In this instance, both microchip and passport numbers should be recorded on the certificate.

Sycamore Poisoning - Seasonal Pasture Myopathy

by Home Farm Equine • 6 October 2021
As the temperatures begin to rise and the sun starts to shine, regrettably so does the risk presented to the horses caused by Sycamore seedlings and seeds. Eating these can cause Seasonal Pasture Myopathy (previously known as Aytypical Myopathy / Sycamore poisoning). This condition has a very sudden in onset, with clinical signs consisting of: stiffness, reluctance to move, muscle tremors, sweating, weakness, lethargy, difficulty in breathing, reluctance to work, red or brown urine, choke, colic, low head carriage, fast or irregular heartbeat and sudden collapse. The time from the onset of symptoms to collapse can be as short as 24 hours. The helicopter shaped seeds are now springing up as seedlings, which are also poisonous. We would advise pulling up all seedlings before allowing horses to graze any affected pasture. Seeds can travel up to 200metres from the tree, especially in the winds we have been experiencing lately, so please be vigilant. Seedlings, seeds and leaves of Sycamore trees can be tested for the toxin Hypoglycin A, which causes SPM. The Royal Veterinary College, London is carrying out this testing. http://www.rvc.ac.uk/research/laboratories/comparative-neuromuscular-diseases-laboratory/diagnostic-services#panel-n-e-w-atypical-myopathy-testing If your horse shows any of these signs, or you are worried after grazing near sycamore trees, please call us immediately on 0115 9899411 .

Castration Information

by Home Farm Equine • 6 October 2021
When to castrate? Most horses are castrated as yearlings, however anytime after 6months is acceptable providing both testicles have descended. When colts mature into stallions, and they reach 2 years old, the testicles become much larger and have bigger blood vessels which make the castration procedure more difficult as they require ligation (tying off) of these vessels. It is normal to try and avoid the fly season from May to October as the castration wounds are left open and do attract flies which is a major cause of post castration infection. How to castrate? Well-handled colts up to 18months old can usually be castrated standing with heavy sedation. However, if they are likely to kick or have unusually large testicles they will need to be “knocked down” and given a short general anaesthetic (GA) which makes the process safer for all concerned and allows the vet to tie off the large testicular blood vessels. The process usually takes 15 minutes and then a further 15-30 minutes for the horse to stand up again. An area of flat, clean grass or a school surface is required. Post castration care Routine care is simple but essential and without these complications are very common. The castration site wounds are always left open to allow the post–op swelling fluid to drain away. The removal of the testicles leaves a cavity which has to fill in and heal from the inside; this process produces inflammatory fluid which must be allowed to drain. It is ESSENTIAL that the wound is hosed TWICE daily for 5 minutes and a scab, if present, is wiped away (with some cotton wool in dilute Savlon or Hibiscrub) to stop the scrotal skin edges sticking together and trying to heal and close. The wound must be kept open for at least a week. Failure to do this will allow the wound to close too soon and a large fluid swelling at the site and swelling of the sheath will occur. This will then require the vet to visit and reopen the site and put the horse on a course of antibiotics. It is very important that the horse is turned out to EXERCISE as this will reduce the amount of swelling of the sheath. Even with exercise it is normal for the sheath to swell to half a honey melon size. We normally recommend that the colts are turned out the same day as the castration, but adult stallions are turned out the day after castrate. Tetanus cover is essential and if not vaccinated it will need an anti toxin injection to give immediate protection. Pain relief is recommended with “bute” given twice daily for 5-7 days. Antibiotics are not routinely given as these surgeries are left open to drain and thus are not required. Although castrations are considered to be a very routine procedure it must be remembered that in the horse they are a relatively major surgical operation with potential fatal complications such as haemorrhage and evisceration of small intestine through the surgical wound. These complications can be reduced to almost “theoretical” providing the correct techniques are used in relation to the size, age and type of male horse being treated. For owners the mainstay of care is thorough cold hosing and cleaning of the wound for at least a week and providing good clean turnout exercise. Contact with mares should be avoided for one month. If you have any further questions, please do not hesitate to contact us on 0115 989 9411.

Equine Dental Care - Facts & Information

by Home Farm Equine • 6 October 2021
Incisor and Canine Teeth Problems with the incisor and canine teeth are thankfully rare and are mainly the result of trauma, such as kicks from other field-mates or hooking their teeth on a hay net. Some geldings develop tartar and calculus on their canine teeth and require this to be cracked off each year. Unless they develop cavities like their sweet toothed owners! Incisor teeth start to wear out in the mid to late 20’s but this is variable. Cheek Teeth These are termed hypsodontal which means that, unlike ours, they do not have a distinct crown above the gum and root below. The constant grinding action of a horse chewing wears away the emerging tooth. In the wild the rough forage and sand picked up with grazing means this process of emergence versus wear and tear remains in fine balance. However, with a nicely manicured pasture and soft palatable concentrate feeds, the teeth don’t wear away as fast as they would in the wild and so develop overgrowths of enamel at the grinding edges of the upper and lower cheek teeth. Routine Dental Care Your horse should have its teeth checked annually by an equine vet or an accredited Equine Dental Technician (EDT). It is important that you take the time to ensure the person you are trusting with your horse’s teeth is a properly qualified. ANYBODY can call themselves an ‘equine dentist’ with absolutely no training or qualification. The vast majority of routine dental care is to address this issue of enamel overgrowths, which develop into sharp points (below left) or enamel transverse ridges (ETR below right). If left untreated the commonest signs of enamel overgrowths are: Quidding - dropping food. Balling – food pouches in the cheeks like a hamster Inappetence - reluctance to eat Tossing of the head or biting discomfort. Smaller enamel overgrowths can be easily removed with a hand rasp or ‘float’. A gag must be placed in your horse’s mouth to safely and properly inspect and rasp the teeth. About 1 in 20 horses find this frightening and require light sedation. The way to avoid this is to have your horse checked each year from two years old so that they are used to having a ‘Gag’ put into their mouth. Most horses do not need any actual rasping until they are 4- or 5-year-olds when they have all their adult cheek teeth in place. Some horses will need these enamel overgrowths removed twice yearly. More severe overgrowths – hooks and ramps (see below) - do occur and are often caused by malformation of the teeth such that they do not have an opposing tooth to wear against. Hooks and ramps require motorised burrs to remove these large areas of diamond-hard enamel. They commonly recur at the same rate that the tooth is erupting, i.e., 2-3 mm per year, and so require treatment every year or so

Equine Emergencies - First Aid

by Home Farm Equine • 6 October 2021
The following information will cover points on the following: Wounds Colic Lameness Choke WOUNDS LOCATION OF THE WOUND Wounds on the leg sheath/joints on the fore and hind legs need an examination. The horse may be acutely lame with a tendon sheath/joint infection. THIS IS A TRUE EMERGENCY AND A VET MUST BE CALLED AS SOON AS POSSIBLE

Veterinary Acupuncture

by Home Farm Equine • 6 October 2021
Veterinary Acupuncture is a complementary treatment that is increasingly being recognised as a useful treatment for a wide range of conditions. It should be stressed that the term “complementary” is the correct term for the use of veterinary acupuncture, as this therapy complement our conventional veterinary care. It is an adjunct, not a replacement, although in some situations it can be used as a sole treatment.

Equine Cushings Disease

by Home Farm Equine • 6 October 2021
What is Cushing Disease? The average age of horses with Equine Cushing disease is 19 years old with a range of 7 to 40 years. There is no sex predisposition but ponies appear to develop the disease more frequently.
More posts
Share by: