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Equine

Core Vaccines Every Horse Needs

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There are many possible dreadful diseases that horses can contract through various insect vectors, ticks, wildlife and even wounds that are rather easy to prevent with routine core vaccinations. Oklahoma has just about every insect known to man to offer, as all Oklahomans are fully aware of especially in the spring and summer, making it a very good environment for some of these key viruses to spread. The five types of diseases that will be discussed in this article are commonly referred to as the deadly five, and that is why they make the core vaccine list because if one of these diseases is contracted it can be game over for your horse. Before spring arrives, the core vaccines should be on every horse owners to do list as a common health care checklist that should be just as routine as deworming and dental care.

The American Association of Equine Practitioners (AAEP) and American Veterinary Medical Association (AVMA) have established key guidelines for vaccinations for horses that are required based on risk to the public and to the horse themselves. The five diseases listed as core vaccines are Rabies, Tetanus, Eastern equine encephalomyelitis virus, Western equine encephalomyelitis virus and West Nile virus.

The AVMA defines core vaccinations as those “that protect from diseases that are endemic to a region, those with potential public health significance, required by law, virulent/highly infectious, and/or those posing a risk of severe disease. Core vaccines have clearly demonstrated efficacy and safety, and thus exhibit a high enough level of patient benefit and low enough level of risk to justify their use in the majority of patients.”  (AAEP website)

The reason these deadly five diseases are listed as core vaccines is because they pose a possible public health risk, are highly virulent or infectious, have a high mortality rate and can be effectively controlled with routine vaccination with great efficacy. It’s important to remember that vaccines are not 100% effective for every disease but well worth that risk when it comes to protect against these five deadly diseases.

There are many other diseases that horses may or may not need to be protected against with vaccinations. These diseases are listed under “risk based” immunizations depending on travel, environment, geographic circumstances and even competition/racing venue requirements before entering into an event. With recent localized outbreaks of equine herpes virus at race tracks, shows and barrel races, many venues and race tracks require very recent vaccinations for these viruses before permitted onto the grounds. Here is a list of risked based diseases vaccinations are available for: Anthrax, botulism, equine herpes virus 1 & 4, equine viral arteritis, influenza, rotaviral diarrhea and strangles. These diseases and the risk of contracting them must be weighed on an individual horse bases versus the risk of the vaccine itself.

Many vaccines today that are available for horses have all core vaccines in one shot except rabies. One vaccine provider has developed the first all five core diseases in one single vaccine. Horses just like other species require multiple boosters to generate an appropriate immune response to be protective. Unvaccinated horses or horses that don’t have a documented vaccine history it is recommended to have at least one booster four to six weeks after the first dose to get an adequate response and then annually after that. In some endemic areas of the country with higher cases of West Nile and other viral encephalomyelitis diseases due to prolonged mosquito vector season it is often recommended to have a booster in the mid-to-late summer to have added protection against these particular viruses.

Below is a breakdown of each disease and its importance for your horse and even yourself to be protected against.

Rabies –

Highly deadly virus that is unsurvivable for any mammal that contracts the disease and begins to show clinical signs, even for humans. As of 2016 only four people have survived rabies infection after showing clinical signs, so the odds are very poor. One of the most difficult aspects of rabies in horses is the variability of clinical signs. Horses can display two clinical manifestations of the disease: Furious/Mad form or Dumb/Stuporous but really it can look like anything early on. Veterinarians are trained that rabies can display almost as anything and should always be on the list for a horse that presents with neurologic symptoms, especially horses with no vaccine history for rabies. Horses can display colic, ataxia, blindness, hypersalivation, depression, weakness and even lameness. Also there is no ante-mortem test meaning there is no test to confirm rabies until the horse is dead or euthanized and the brain is collected for testing. Rabies is transmitted via bites from infected rabid wildlife such as skunks (highest transmitter in Oklahoma), raccoons, fox and bats.

EEE/WEE –

Eastern and Western equine encephalomyelitis is transmitted like other viral enchephalitides via the mosquito vector. Clinical signs are neurologic signs of ataxia, blindness, head pressing or head tilt, recumbency, seizures and paralysis of the throat/tongue. Only up to 15% of horses survive EEE. WEE has a better survival rate up to 50% and has very similar sign as EEE. Birds are common carriers of EEE/WEE and are the reservoir for these viruses.

West Nile –

A very commonly know virus that is also transmitted by mosquitoes to horses, humans, birds and other mammals. Birds again are the largest reservoir for this virus. The virus affects the central nervous system by creating inflammation around the brain and spinal cord. Symptoms or clinical signs are fever, depression, muscle fasciculations, weakness and ataxia. The severity of the disease is horse dependent and not all horses get the disease but among those horses that do about 1/3 will die from it. Also almost half of horses will have lasting neurologic effects from the disease.

Tetanus –

The causative bacterium was first discovered in 1884 by injecting wound exudates from humans with tetanus into animals leading to the discovery that Clostridium tetani is the causative bacteria. The bacteria is found everywhere in the environment including the soil and manure of horses. Horses are rather sensitive to the neurotoxin produced from Clostridium tetani that leads to the clinical signs of tetanus. The bacteria enter the horse’s body through wounds, cuts or even surgical wounds such as castration sites. The spores of the bacteria turn into the vegetative form when it begins to grow and replicate. The neurotoxin produced from the bacteria enters the central nervous system by peripheral nerves. The clinical signs of tetanus are muscle spasms, stiffness, prolapsed third eyelids, extended head and neck, elevated tail and retracted lips. As the disease progresses, horses will become recumbent and have difficulty breathing. Life saving treatments can be implemented to save the infected horses but still up to 75% of horses will die.

What all these disease have in common besides death is that these deaths are extremely excruciating, painful and miserable. There is no doubt from seeing these cases personally and from watching teaching videos that these horses are suffering enormously. What makes it even more difficult and disheartening when we see these cases is that they are so easily preventable with vaccination. The bottom line is that vaccines can save your horse’s life from these deadly diseases and vaccines are rather inexpensive especially compared to the expensive of trying to treat the horse once they are ill. Please talk to your veterinarian about getting your horse or horses protected with core vaccinations and if any other vaccinations are necessary based on your situation.

Read more great articles in the March 2020 issue of Oklahoma Farm & Ranch.

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Equine

From a Kid’s Horse Point of View – Western Housewives

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By Summer McMillen

As the land starts to thaw and cowboys and cowkids everywhere are gearing up for spring there is one specimen in particular that is dreading the coming season. And that is ponies. Or more specifically, kid horses.

Let’s look at life from the kid horses point of view for a second.they have the winter off. They’ve gotten to enjoy some much needed R&R in the back pasture. Their hair has gotten long and so have their hooves. They’ve spent the winter feasting on native grasses, alfalfa, and the occasional bucket of grain when it’s was especially cold.

They’ve gotten to wonder aimlessly while the real work horses were still being caught for essential tasks. The most work these kid horses have had to endure the last few months were being tied to the arena fence to get the cockleburs brushed out of their tail.

Yes, life has been calm for these kid horses. But, there is a season for everything and the season for being used and abused is fast approaching.

My own children all share a little pony they affectionately call “Rubble.” He is a certified welsh pony that is as tall as he is wide and is as passive as he is…not. They spend summers riding him bareback. And when they aren’t riding him bareback they are riding him fully saddled. Tiny little bit in his mouth being yanked in every which direction.

The little fellow takes everything in stride. But I can feel him starting to resent me from the back pasture already. Every time I carry him some feed he gives me a look that just screams “please keep all three of your children away from me forever please.” I laugh at him and tell him he doesn’t mean it and then he runs away as fast as he can. It’s a special bond.

Kid horses are funny like that. We entrust them with the lives of those most special to us. We saddle them up and throw the little cowkids on them and assign them small tasks like moving 200 pairs to a new pasture or, holding the herd while dad doctors wheat cattle. More often than not, the young partners get their job done. Sometimes in unlikely ways.

Last summer my daughter hopped up on Rubble bareback and was going to trot down the road and get our mail. A simple and harmless task I thought. I was proud of her for taking the initiative. I was also proud of her when I looked out the window, saw the little pony start crow hopping with excitement and the unassuming 8-year-old being catapulted in the ditch. Instead of crying she climbed back on. Tenacity, I thought. That’s what kid horses are good at teaching.

A few months later I was watering all our geldings. The three kids whom I raised, better known as the three amigos, were all harassing the little pony. My youngest son decided it was his turn. He climbed up on Rubbles back as proud as a peacock.  But, he couldn’t help himself. He wanted to look that pony in the eye. So he starts leaning. Farther and farther until he leaned all the way to the ground. Lost a boot in the process. Instead of rushing to his side I waited for the tears. He was only two years old at the time after all. Instead his face was filled with glee. Joy, I thought. That’s what kid horses are good at teaching.

My middle boy is afraid of heights. So mounting a horse has been tough for him. When we introduced Rubble, I wasn’t sure he could even manage his height. After a little encouragement he donned his chaps, boots, and hat with a turkey feather in it and mounted the little horse. In a matter of five minutes the little cowboy had rubble trotting around the arena with his hand in the air and his spurs in his neck. (Gently of course.) Confidence builder, I thought. That’s what kid horses are good at teaching.

While, most of the time kid horses are a nuisance. Eating all our alfalfa and requiring special horse shoes to function properly.. they are more often than not a priceless gift. Teaching the ones we love most how to have tenacity, joy, and confidence.

While the ponies in our life may love their time off in the winter you can’t convince me that they don’t love their jobs in the spring. Even if it’s just a little bit. When that little cowboy shoves a bucket of grain in their face after a job well done together, the ponies head sits a little higher and so does that little cowboys hat.

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Equine

Foot Abcesses in Horses

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By Garrett Metcalf, DVM

A foot abscess is a common occurrence in horses throughout the year, with wet weather often contributing to an increase in cases. These abscesses can cause significant pain, lameness, swelling, and overall misery, making it important to address them quickly and manage pain to keep the horse comfortable. There are various methods used to treat foot abscesses, and this article will outline techniques to evaluate and treat them as efficiently as possible.

A foot abscess is a localized or sometimes diffuse infection trapped between the sensitive and non-sensitive laminae within the hoof capsule. Abscesses may develop spontaneously due to everyday stress and environmental factors that allow bacteria to penetrate down to the sensitive tissues. Other causes include penetrating injuries to the sole from nails, sharp rocks, or even thorns. Poor hoof care and misdriven shoeing nails can also lead to abscess formation. Common sites include the white line, where the sole and hoof wall meet, and the bars of the heels.

The level of lameness caused by a foot abscess can vary, but it often results in visible discomfort at the walk and can even cause non-weight-bearing lameness. Swelling that begins at the foot and moves up the leg may occur, particularly if the abscess migrates and ruptures at the coronary band. These cases are often referred to as “gravel” abscesses, which are simply abscesses that find the path of least resistance and exit at the coronary band, creating a draining tract. In some cases, especially involving a hind foot, the horse’s movement may appear so abnormal that it mimics neurological issues, confusing owners and veterinarians.

Diagnosing a foot abscess begins with a lameness exam. Most affected horses will be visibly lame at the walk, though in some cases a trot may be necessary to detect the issue. Regional nerve blocks can help confirm that the pain is originating from the foot and not another part of the limb. Horses with abscesses often show an increased digital pulse and, occasionally, noticeable heat in the foot. The bounding pulse is due to inflammation and is most easily felt just above the hoof near the ankle. If the horse is shod, removing the shoe is often necessary for a thorough exam. Hoof testers are useful in identifying the most painful area, and horses with abscesses are typically reactive to pressure. Cleaning out the foot with a hoof knife is important for exposing any defects or tracts in the sole or frog. Often, a dark spot or line will lead to the source of the abscess.

There are multiple ways to treat an abscess, and opinions vary widely, but my preferred approach is to open the abscess as soon as possible. This provides nearly immediate relief for the horse and allows the infection to begin resolving. A sharp hoof knife or loop knife is a reliable tool to open the abscess and create drainage through the bottom of the foot. Allowing the abscess to drain from the sole reduces the risk of a gravel abscess and makes it easier to treat the area with topical poultices. After opening, it’s important to bandage the foot both to draw out remaining infection and to keep the area clean.

A large baby diaper makes a simple, effective bandage. It’s absorbent and fits the hoof well. Secure it with layers of Vetrap, duct tape, and Elastikon, or place the hoof in a medicine boot to keep it protected. Poultice choice is often based on personal experience and availability, but the goal is the same — to draw out infection and prevent contamination. Products like Magna Paste, an Epsom salt-based poultice, are effective, as is a homemade mix of sugar and Betadine. There are many other options, but whatever product is chosen should be safe and offer antimicrobial properties.

In some cases, an abscess may be difficult to locate or open. Soaking the foot in warm Epsom salt water can help soften the hoof and encourage the abscess to rupture or become easier to identify. Pain management is also helpful while waiting for the abscess to surface. If the abscess continues to recur or proves difficult to treat, radiographs can help evaluate the hoof’s internal structures. While most abscesses don’t show up on X-rays — since the fluid is the same density as the hoof — they may be visible if gas is present within the abscess. Radiographs are especially important in cases of puncture wounds, to ensure deeper structures like the coffin joint or navicular bursa aren’t involved. In cases of penetration, it’s best to leave the foreign object in place until X-rays are taken, which helps determine the extent of the injury and what structures may have been affected.

While preventing all foot abscesses isn’t always possible, good hoof care goes a long way. Regular trimming on a consistent schedule helps maintain healthy laminae and prevents stretching of the white line, which can allow bacteria to enter. Careful shoeing practices, including proper nail placement, can further reduce the risk of abscess development.

Foot abscesses are painful, frustrating, and often sudden — but with proper diagnosis, drainage, and aftercare, horses typically recover well and quickly return to soundness.

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Equine

The Pull of the Barn

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When I was younger, I saw plenty of old Westerns. They were fun to watch, but one part always stressed me out. Inevitably, a cowboy would get shot or thrown from his horse, and while the cameras stayed on the fallen rider, I worried about the horse. Would it wander around lost on the prairie, never finding its way back? The truth is, most horses know exactly where home is. Turn one loose, and it will drift toward the barn. Ride one out, and the trip away from home feels steady, but the return picks up pace the moment the barn roof comes into sight. We even have a name for it: barn sour.

Horses are prey animals, and survival has always depended on familiar ground. For a domestic horse, the barn means food, water, and the company of the herd. Ethologists (scientists who study animal behavior) point out that horses are quick to learn patterns. When hay and grain appear in the same place every day, that spot becomes magnetic. Over time, repetition lays down mental trails as clearly as cattle wear down physical ones in a pasture. What appears to be stubbornness is actually instinct. The barn equals safety, and safety equals survival. Riders from cavalry days to modern ranches have written about horses quickening their pace on the way home. And though the land changes, that pull never does.

People are not so different. We all have barns in our lives — comfort zones we gravitate toward, routines that steady us. They serve a purpose. Like a horse standing at the gate, we lean on safe ground when life feels uncertain. But the pull can also hold us back. A horse that refuses to leave the yard never discovers what lies beyond the fence, and the same is true for us.

That balance shows up in history too. Old cattle trails once served their purpose, guiding herds north and helping to build economies. But when railroads and fences changed the landscape, those well-worn tracks became ruts. Progress required new paths. Our own habits work the same way. Some keep us grounded. Others only circle us back to where we started.

When I see my horses drifting toward the barn, I think less about impatience and more about instinct. They are drawn to the familiar, and so am I. The barn matters. It is the anchor point, the place of rest. But the pasture matters too, because growth is waiting outside the gate.

Those old Westerns had it right in at least one way. The cowboy’s horse was never going to wander off aimlessly. It would head back to camp, back to the barn. That simple truth still plays out in every pasture and arena today. Horses know where home is. The question is whether we will let the pull of our own barns keep us tied too tightly, or whether we will use them as a base to step farther into the wide-open ground ahead.

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