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Deworming Horses


Veterinary reviewed information on deworming horses and the products used.

Internal parasites are insidious culprits. They steal, damage, and even kill. The worst part of the whole scenario is that they can't be totally eliminated, only controlled. In the theft department, internal parasites rob in two ways: First, they steal nutrients from the horse's body; second, they take money from the owner's pocket in the form of lost food value. Adding to the problem is the fact that there are many types of parasites, and each seems to have its own unique way of attacking its host--your horse......taken from 'The Horse'......


There are several different dewormers, or anthelmintics, currently available. Most are broad-spectrum, meaning that they are effective against several different types of parasites. It is generally best to use a broad-spectrum dewormer as the basis of your program for  deworming horses. If a specific problem is identified, such as tapeworms or encysted small strongyles, a more specific dewormer can be used. 

No deworming product is 100 percent effective in ridding every horse of all internal parasites. However, it is not necessary for a product to kill every worm in order to improve the horse's health, minimize the risk of serious disease, improve feed efficiency, and reduce pasture contamination with parasite eggs and larvae. 

The various deworming compounds each have benefits and weaknesses against different parasites as well as a defined period of time for which they are effective. It is a good idea to have your veterinarian help you determine the best deworming interval for your horse. Fecal egg counts can be very useful in this regard, as well as in evaluating the effectiveness of the product you are using.  


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Eqvalan

Ivermectin
This dewormer provides effective control of the following parasites or parasitic conditions in horses: large and small strongyles, pinworms, ascarids, hairworms, large-mouth stomach worms, bots, lungworms, and intestinal threadworms, as well as Summer Sores, and Onchocerciasis.

Eqvalan Gold




Ivermectin and praziquantel
 For the treatment and control of intestinal roundworms, lungworms, tapeworms, bots, and skin lesions caused by Habronema and Draschia spp (summer sores) and Onchocerca spp microfilaria (cutaneous onchocerciasis) in horses. 



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Solvet  Liquid Ivermectin for Horses 

Solvet Liquid Ivermectin for horses is indicated for the treatment of Large and Small Strongyles, Intestinal Threadworms, Pinworms, Ascarids, hairworms, large-mouth stomach worms, Neck threadworms, Bots.

The Only Water Based Dewormer for Horses in Canada 
Single, 120ml and 1000ml multidose available

Panacur

Fenbendazole 
Use this dewormer for the control of large strongyles (Strongylus edentatus, S. equinus, S. vulgaris), small stongyles, pinworms (Oxyuris/equl), and ascarids (Parascaris equorum) in horses.
Paste, solution& Granules available


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Quest

The active ingredient in Quest is Moxidectin. It is effective against roundworms or ascarids, pinworms, large strongyles small strongyles, hairworms, stomach worms, Onchocerca cervicalis and bots. This is the only dewormer that kills dangerous  encysted mucosal larvae (LL3 and L4) before they emerge.  

Quest Plus

The active ingredients in Quest Plus are moxidectin and praziquantel. Quest Plus is effective in treating the same internal parasites as the original Quest in addition to tapeworms.



EQUINE RECOMMENDED DEWORMING SCHEDULE Colorado State University

All egg count thresholds given here are guideline and based on the range of counts typically generated by the McMaster technique.

Adult Horses

LOW SHEDDERS (<200 EPG – EGGS PER GRAM OF MANURE)

  • Fecal egg count performed prior to deworming in spring (ideally spring and fall)
  • Spring (March) – ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®), moxidectin (Quest®)
  • Fall (October) – ivermectin w/ praziquantel (Equimax®, Zimectrin Gold®) or moxidectin with praziquantel (Quest Plus®)

MODERATE SHEDDERS (200-500 EPG)

  • Fecal egg count performed prior to deworming in spring (ideally spring and fall)
  • Spring (March) – Ivermectin (Solvet®, Zimectrin®, Eqvalan®, IverCare, etc), moxidectin (Quest®)
  • Late Summer (July) – ivermectin
  • Fall (October) – ivermectin w/ praziquantel (Equimax®, Zimectrin Gold®) or moxidectin with praziquantel (Quest Plus®)

HIGH SHEDDERS (>500 EPG)

  • Fecal egg count performed prior to deworming in spring and fall to monitor for signs of resistance
  • Spring (March) – ivermectin (Solvet®, Zimectrin®, Eqvalan®, IverCare®), moxidectin (Quest®)
  • Summer (June) – ivermectin
  • Early fall (September) – ivermectin w/ praziquantel (Equimax®, Zimectrin Gold®)
  • Late fall (November) – moxidectin

In general: Check treatment efficacy with fecal egg counts. The treatment recommendations made here are general guidelines based on current drug resistance findings across the world. Other types of dewormer may still be effective on your farm, and can be used if you have determined good efficacy with a fecal egg count reduction test.

Foals

  • Two months of age – fenbendazole (Panacur) or oxibendazole (Anthelcide)
  • 4-5 months – Fecal egg count to track the occurrence of ascarids versus strongyles. Treat for ascarids with ​fenbendazole (Panacur) or oxibendazole (Anthelcide).
  • Treat with ivermectin for strongyles at approximately five months
  • Treat with ivermectin plus praziquantel before the end of the calendar year
  • As short yearlings, check fecal egg count for presence of ascarids and treat those with fenbendazole or oxibendazole if present
  • During the yearling year, treat for strongyles approximately three times with ivermectin followed by one treatment with moxidectin plus praziquantel by the end of the grazing season.
  • Check treatment efficacy with fecal egg count reduction tests

DEWORMING PROTOCOL GUIDELINES
Created by the Equine Services section of the Colorado State University. Edited by Dr. Martin Nielsen

Some of the important points and recommendations are:

  1. Non-chemical parasite management:
    Rotate pastures
    Cross graze pastures with ruminants if possible
    Remove manure frequently
    Harrow/drag pastures in hot/dry weather and keep horses out for two months
    Avoid overstocking pastures

  2. Measure the success of parasite control by doing fecal analysis at least once a year. Fecal egg count—an estimate of the number of parasite eggs shed by the horse.
    Talk to your veterinarian before doing a fecal analysis to be sure enough time has passed since your horse’s last deworming for eggs to have reappeared in the feces. This Egg Reappearance Period differs depending on the dewormer used.
    Fecal egg count reduction test—worm egg count should decrease 90% when measured 14 days after deworming, depending on the product used.
  3. Treat for tapeworms once a year with use of a dewormer containing praziquantel (Zimectrin Gold® or Quest Plus®)
    .
  4. In their encysted larval stage, small strongyles (cyathostomes) are only susceptible to a couple dewormer categories. Given drug resistance findings world-wide, moxidectin (Quest) would be drug of choice in most cases. Treatment for the encysted larvae are recommended in the fall near or at the end of the grazing season, before going into the winter.

  5. Don’t use the same pasture or paddocks year after year for mares and foals. This allows build-up of a high level of ascarid eggs, which can survive between years and infect new foals being born in the spring.

Note: The two parasites of most concern in adult horses are the small strongyles (encysted strongyles, cyathostomes) and tapeworms. In young horses the parasite of biggest concern is the ascarid. The best way to determine the deworming schedule for your horse is to involve your veterinarian and to perform fecal egg counts to determine: 1) dewormer efficacy in your equine operation, 2) monitor for presence of ascarids in young horses, and 3) identify low, medium or high strongyle egg shedders among adult horses. A surveillance-based deworming program allows the use of less dewormer, can save money, and ensures that the program is effective.

​Created by the Equine Services section. Edited by Dr. Martin Nielsen.​


Information about equine internal parasites from The AAEP (American Association of Equine Practitioners)


Internal parasites, or worms, can be silent thieves and killers. They can cause extensive internal damage without you even realizing your animals are heavily infected. The effects of internal parasites on a horse range from a dull haircoat and unthriftiness to colic and death. Internal parasites lower the horse's resistance to infection, rob the horse of valuable nutrients, and in some cases, cause permanent damage to the internal organs.

In terms of management priorities, establishing an effective parasite control program is probably second only to supplying the horse with clean, plentiful water and high-quality feed. It's that important!

TYPES OF INTERNAL PARASITES

There are more than 150 species of internal parasites that can infect horses. The most common and troublesome are the following:

  • Small strongyles (cyathostomins)
  • Roundworms (ascarids)
  • Tapeworms
  • Large strongyles (bloodworms or redworms)
  • Pinworms
  • Bots
  • Threadworms

Probably the most important, in terms of health risk, are the first three: small strongyles, roundworms, and tapeworms.

The lifecycle of most internal parasites involves eggs, larvae (immature worms), and adults (mature worms). Eggs or larvae are deposited onto the ground in the manure of an infected horse. They are swallowed while the horse is grazing, and the larvae mature into adults within the horse's digestive tract (stomach or intestines). With some species of parasite, the larvae migrate out of the intestine, into other tissues or organs, before returning to the intestine and maturing into egg-laying adults.

Small Strongyles

Small strongyles are of major importance. Small strongyle larvae do not penetrate the intestinal wall or migrate through the tissues. Instead, they burrow into the lining of the intestine and remain dormant, or "encysted" (enclosed in a cyst-like structure), for several months before completing their life cycle. During this time, the larvae are resistant to most dewormers.

Small strongyle larvae can cause severe damage to the lining of the intestine, especially when large numbers of larvae emerge from the encysted stage all at once. Adult small strongyle females are very prolific and their eggs comprise over 95 percent of those found in fecal egg counts of horses. The large majority of horses tolerate small strongyles without showing signs of disease or discomfort. Colic and diarrhea can occur in heavily infected horses. These parasites can also cause weight loss, slowed growth in young horses, poor coat condition and lethargy or lack of energy. The early and late larval stages (before and after they burrow into the lining of the intestine) and the adult parasites used to be sensitive to several dewormers. However, dewormer resistance to several of these is an increasing problem in these parasites. But currently there are only two types of dewormer that are marketed for treatment of the encysted larval stage—the stage that causes the most damage  -  and resistance has been documented to one of these. Ask your veterinarian which products are currently most effective. 

Roundworms

Roundworms, or ascarids, are most often a problem in young horses (especially foals, weanlings and yearlings). Adult roundworms are several inches long and almost the width of a pencil; in large numbers they can cause blockage (or impaction) of the intestine. In addition, roundworm larvae migrate through the internal organs until they reach the lungs. They are then coughed up and swallowed back into the digestive tract to complete their life cycle.

Virtually all foals become infected with roundworms, and very few of them ever develop symptoms of disease. However, large infections can lead blockage of the small intestine of foals and young horses, leading to a painful and life-threatening colic. Roundworm infection in young horses can cause coughing, poor body condition and growth, rough coat, pot belly and colic. Colic is most likely in older foals (over 3 months of age) that are heavily parasitized with roundworms when dewormed for the first time. By this stage, the roundworms can have matured into adults that could cause an impaction. In this situation, it is a good idea to have your veterinarian deworm the foal or recommend a deworming plan for the foal. Resistance to many of the dewormers has become a big problem in controlling ascarid infections in foals.

Tapeworms

Like with the other parasites mentioned here, the large majority of horses harbor tapeworm infections without showing any signs of disease or discomfort. However, tapeworms can cause colic, ranging from mild cramping to severe colic that requires surgical treatment. The tapeworm life cycle involves a tiny pasture mite as an intermediate host, and horses are at a risk of developing tapeworm infection when they eat this mite in the grass.

Praziquantel has been demonstrated to be highly effective against tapeworms and is available in several dewormer products. Pyrantel pamoate given in a double dose is effective as well. Most horses should be dewormed for tapeworms annually.

Consult your veterinarian for advice on the best product to use for your situation.

Other Internal Parasites

Large strongyles (bloodworms) have become extremely rare in managed horses because they are effectively controlled by most available dewormers. Infection with these parasites can cause unthriftiness, weight loss, poor growth in young horses, anemia (low numbers of red blood cells) and colic. In most cases, colic caused by these parasites is relatively mild, but severe infections can result in loss of blood supply to a portion of the intestine, leading to severe and potentially fatal colic.

Pinworms lay their eggs on the skin around the horse's anus. The irritation they cause makes the horse repeatedly rub its tail.

Threadworms are mostly a problem in young foals, in which they can cause diarrhea.

Bots don't usually cause major health problems, although they can damage the lining of the stomach where they attach. They may also cause small areas of ulceration in the mouth, where the larvae burrow into the tissues for a time after the eggs are taken into the mouth.

Lungworms cause chronic coughing in horses, ponies, and mules. Donkeys are the natural host of this parasite, so typically they don't show any obvious signs of infection.

SIGNS OF PARASITISM

Contrary to popular belief, horses can have large numbers of internal parasites while still appearing to be relatively healthy. But in some individuals, especially young horses, parasites can take a visible toll. Common signs of parasitism include the following:

  • Dull, rough haircoat
  • Lethargy (decreased energy) or depression
  •  Decreased stamina
  • Unthriftiness or loss of condition
  • Slowed growth in young horses
  • Pot belly (especially in young horses)
  •  Colic
  •  Diarrhea

FECAL EGG COUNTS

One of the most useful tools in a parasite control program is the fecal egg count—microscopic examination of fresh manure for parasite eggs. This simple test allows the veterinarian to determine which parasites are present and whether the infection is light, moderate, or heavy. This information is important in developing a deworming program for your horse or farm. Furthermore, egg counts are very important in monitoring the effectiveness of the program, where samples are analyzed both before and after deworming a group of horses.

Fecal egg count involves collecting two or three fresh manure balls from the horse to be tested and sending the manure sample to a veterinary laboratory. Results are expressed as eggs per gram (epg) of manure. A fecal egg count of less than 200 epg suggests a light parasite load. Horses with high fecal egg counts of 500-1000 epg suggest the interval between deworming is too long.

It is important to note that a negative fecal examination does not mean the horse is free of internal parasites. Some types of parasites produce eggs only intermittently. Larvae do not produce eggs at all, and may be present in large numbers in a horse with a fecal egg count of zero. And tapeworm eggs may be missed with routine fecal egg count techniques. The results are most useful when several horses on a farm are tested on the same day. This information gives the veterinarian and farm manager a good idea of the level of parasitism on the property.

DEWORMERS

There are several different dewormers, or anthelmintics, currently available. No deworming product is 100 percent effective in ridding every horse of all internal parasites. However, it is not necessary for a product to kill every worm in order to improve the horse's health, minimize the risk of serious disease, improve feed efficiency, and reduce pasture contamination with parasite eggs and larvae. As mentioned above, resistance has developed against several of these dewormers in both small strongyle and roundworm parasites. It is therefore of utmost importance to routinely test the effectiveness of a given dewormer on every horse establishment.

Methods of Administration

There are three main ways of administering dewormers:

  • Oral paste syringe
  • Feed additive (powder, liquid, or pellets)
  • Nasogastric (stomach) tube

All three methods are effective, provided the proper dose is given at the right time, the horse receives the full dose, and resistance has not developed in the parasites being targeted. The dose must be calculated based on the horse's body weight. Weight tapes are an accurate enough way of estimating a horse's body weight for this purpose.

Deworming pastes and feed additives are convenient and easy to administer. However, some horses find them unpalatable and spit them out or refuse to eat them. So be sure that all of the dose you've given is actually consumed by the horse.

Tube deworming is a highly effective means of ensuring that the horse receives the proper dose because the dewormer is delivered directly into the horse's stomach. However, with the range of dewormers now available, it is seldom necessary for a veterinarian to deworm a horse by this method.

DESIGNING A DEWORMING PROGRAM

There is no single deworming program that suits all horses and all situations. The ideal program for your horse(s) depends on number and ages of the horses on your farm, pasture management and your geographic location. It is best to have your regular veterinarian help you devise an appropriate deworming program for your horse or farm.

Monitoring

Having your veterinarian perform fecal egg counts to determine the amount of egg shedding that your horse has is important. This information will help ensure that the dewormers that are being used are effective and also help determine the frequency of deworming necessary to keep your horse healthy. The outlay of time and money will be well worth it.

A COMPLETE MANAGEMENT PROGRAM

Chemical control using dewormers is just one part of a complete parasite control plan. As parasites are primarily transferred through manure, good management is essential. Some of the procedures listed below can be helpful in reducing parasite burdens:

  •  Keep the number of horses per acre to a minimum to prevent overgrazing and reduce pasture contamination with parasite eggs and larvae
  • Pick up and dispose of manure regularly (at least twice a week during the warmer seasons, even in dirt or sand yards)
  • Do not spread manure on fields to be grazed by horses; instead, compost it in a pile away from the pasture before spreading it out
  • Mow and harrow pastures periodically to break up manure piles and expose parasite larvae to the elements (larvae can survive freezing, but they cannot tolerate extreme heat and drying for very long)
  • Consider rotating pastures by allowing sheep or cattle to graze them, thereby interrupting the life cycles of equine parasites
  • Use a feeder for hay and grain rather than feeding on the ground
  • Remove bot eggs regularly from the horse's haircoat (flea combs work well in some instances)
  • Consult your veterinarian to set up an effective deworming program for your horse(s) and monitor its effectiveness.


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