Equine
The Importance of Equine Vaccinations
By Lauren Lamb, DVM, MS
Vaccinating horses is crucial to overall health maintenance and essential to responsible ownership. It is important to protect the horses against diseases they could be exposed to whether they travel or stay at the stable or farm.
The number of diseases a horse is exposed to is directly proportional to the number of vaccinations necessary to ensure adequate protection. Horses that live a more isolated lifestyle will be exposed to a lower number of diseases and will need to only receive the core vaccinations. On the other hand, a horse that is showing and traveling is exposed to a greater number of diseases. These horses need to receive the core vaccinations plus additional vaccinations due to increased risk.
Another consideration when deciding which vaccines to administer to a horse is treatment costs versus vaccination costs and following boosters.
A good example of this scenario would be the rabies vaccination, which is relatively cheap. A rabies vaccinated horse is not 100 percent protected from the disease. However, the risk of the horse developing the disease if exposed is significantly decreased. The flip side of the coin would be if you did not vaccinate your horse for rabies, which leaves them at significant risk of developing the disease if exposed. This is compounded by the fact that there is no treatment for a horse with rabies.
Vaccines can be divided in to four large groups based on how they are made and how they work when administered: live vaccine, modified live vaccine, recombinant vaccine and killed vaccine. They all contain antigens, parts of the disease-causing organism, that will train the immune system, but they will not cause a clinical disease in a horse.
Live and modified live vaccines are capable of inciting an immune response most like the natural occurring disease without causing the horse to develop the disease. Because they cause such a strong immune response, a booster vaccine does not need to be administered as frequently as the recombinant and killed vaccine. It is very important to administer live and modified live vaccines as directed on the label. Failure to follow labeled directions can result in significant complications or decreased efficacy of the vaccine.
Recombinant and killed vaccines incite an immune response that is sufficient to protect the horse from disease, but less like the natural disease compared to the live and modified live vaccine. Recombinant and killed vaccines require more frequent booster vaccinations, due to the less natural response to these vaccines. Deciding which vaccines to use depends on what vaccines are available and a local veterinarian’s recommendation.
All vaccines are given to a horse with the goal of the horse mounting an immune response to the vaccine. This immune response trains the horse’s immune system to recognize certain characteristics of the disease-causing organism, which in most cases is a bacteria or virus. The horse’s immune system can then react in a timely and aggressive manner that will rid the body of the disease. Without the prior vaccination, the horse’s immune system may not react to the inciting organism in a timely manner, allowing the disease to be established in the horse.
The American Association of Equine Practitioners established guidelines and recommendations for vaccinating horses depending on the level of exposure to diseases, age and pregnancy status.
Eastern and Western Equine Encephalitis, West Nile Virus, Rabies and Tetanus are the core vaccines that each horse living in North America should receive. The core vaccines are based on the high risk of any horse living in North America being exposed to one of these disease. These vaccines provide a very high level of protection but not 100 percent.
Eastern Equine Encephalitis, Western Equine Encephalitis and West Nile Virus are all viruses that affect the horse’s central nervous system. They cause clinical signs of dullness, depression, muscle fasciculation or ataxia. They are all spread by mosquitoes and are seen more commonly in the summer months when the mosquitoes are more prevalent.
Eastern Equine Encephalitis is more commonly seen in the eastern portions of North America and WEE is seen in the western portion of North America. West Nile Virus can be seen in all regions of North America and is the leading cause of encephalitis cases in horses. Horses that have WNV, EEE or WEE have a fair to poor prognosis.
Rabies is a virus that a horse contracts by being bit by another rabid animal. The virus migrates from the bite wound up the peripheral nerves and attacks the horse’s central nervous system. As stated before, no treatment currently exists for rabies.
Tetanus is a disease caused by a neurotoxin that is produced by Clostridium Tetani bacteria. This bacterium is found everywhere in the environment. Once the bacteria gains access to a wound, it will replicate and release the neurotoxin into the horse’s body. If a horse contracts tetanus, there is a guarded prognosis for recovery.
Risk-based vaccines are vaccines that are administered based on the horse’s level of exposure to a disease. Three commonly used vaccines in our practice are Strangles, Equine Influenza, and Equine Herpes.
Strangles vaccine works against the Streptococcus equi subspecies equi bacteria and helps prevent or limit the strangles disease in a horse. It is usually administered to young horses in environments known to have the strangles bacteria present.
Equine Influenza and Equine Herpes are both respiratory viruses that can be spread by aerosolized respiratory droplets. They are extremely contagious and are seen in locations with a high number of horses from many different locations including large horse shows. Consulting a local veterinarian about which vaccines would be prudent given its level of exposure is recommended.
The frequency that a horse should be vaccinated depends on several factors including age, vaccination history and pregnancy status. In general, EEE, WEE and WNV vaccines should be administered in the spring before the mosquito season starts. Most veterinarians will administer the remainder of the core vaccines at this time. Risk-based vaccines may need to be given more frequently depending on the level of risk that the horse is exposed to.
The bottom line is, consult with your veterinarian and develop a vaccination program that works for you and your horse.
For more information on equine vaccination, visit www.aaep.org. The AAEP website provides horse owners with detailed information about core and risk-based vaccines.
This article originally appeared in the January 2016 issue of Oklahoma Farm & Ranch.
Equine
From a Kid’s Horse Point of View – Western Housewives
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.
Equine
Foot Abcesses in Horses
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.
Equine
The Pull of the Barn
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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