Equine
Equine Infectious Anemia: Why do we test and why should you care?
What is a Coggins test, and why is it so important? Why do I need a Coggins test if I am moving my horse(s) out of state or to an event? Why is the test only good for one year? This article will discuss the history of Equine Infectious Anemia and why it is a very important disease to keep under control. It will also discuss the route of transmission from one horse to another and the symptoms that a horse will have if it gets the disease.
Equine Infectious Anemia has been known by many names: Swamp Fever, Slow Fever, Mountain Fever, Equine Malarial Fever, and Coggins Disease, or EIA. It is a lentivirus from the family Retroviridae, and can infect all members of the Equidae family from ponies, donkeys, mules, and horses. EIA has been recognized as a disease of horses for centuries, but it made its big emergence in the 1930s and reached its height of devastation between the 1960s and 1970s. More than 10,000 horses were identified to be infected in 1975, and many of those horses died from the disease. Today the disease is less prevalent, and horses that do have the disease are nearly all-asymptomatic carriers of the disease, showing no signs of the disease. These horses act as reservoirs of the disease to spread to others.
The most common transmitting vector for EIA is biting flies, most commonly horse flies or deer flies. These flies lacerate the skin of horses to suck up a blood meal. The blood of an infected horse will remain on the mouth parts of these flies for a short period of time but long enough to be transmitted to an uninfected horse. Other ways of transmission is sharing hypodermic needles between horses, and it has even been found to be transmitted from mare to foal in utero. Other minor routes of transmission can be from semen, milk and possibly be aerosolization of infectious material.
The clinical signs or symptoms of EIA are often nonspecific and usually the only sign is a fever. In severe cases horses will become weak, depressed, have increase heart rate and respiration rate, ventral edema, anemia, and bleeding from nostrils, and blood in their stools. Some cases will die during the acute phase of the disease, but those that recover will become asymptomatic persistently infected carriers. EIA is difficult to differentiate from other fever-producing diseases such as anthrax, influenza and equine encephalitis.
There is no treatment and no vaccines for EIA. The viral genome of EIA rapidly mutates, making it very difficult to create an effective vaccine to EIA. Once a horse contracts EIA, the horse will always have the disease.
The only method to stop the spread of the disease is by prevention, and the only options to manage infected horses are to quarantine the infected horses at least 200 yards from healthy horses or to euthanize them. That is why testing is key to controlling the spread of this disease. Coggins testing is required once or twice a year depending on the state you live in, before traveling out of state, before entering an organized event, or sale of horses. It is always recommended to get a negative Coggins test before you introduce a new horse into a herd setting to maintain an EIA-free herd.
The Coggins test, developed in 1973 by Dr. Leroy Coggins, a graduate of Oklahoma State College of Veterinary Medicine in 1957, helps detect infected horses with EIA using the AGID method, or Agar Gel Immunodiffusion Assay. Dr. Coggins developed this test while studying viruses at Cornell University. Today, the AGID test has been replaced mostly by the ELISA method. which is the most common test, used in reference labs around the country. The original method of testing of AGID is still considered the “gold standard” internationally.
If a horse is moved internationally they are required to get a Coggins test with the AGID method. A negative Coggins test is required before a health certificate is issued for travel. Generally most states require a negative Coggins test within one year, but some require it every six months. Veterinarians accredited by the USDA are the only veterinarians allowed to do Coggins testing and issue health certificates. Health certificates are issued to insure the horses that are traveling to events or crossing state lines are healthy and allow a level of traceability if a horse does become sick. Most health certificates are issued for 30 days, but some are only issued for 10 days. A Coggins test requires hand drawn or digital images of your horse, identifying markings, address the horse resides, breed, age, sex, and owner’s information to complete the test. Today with a service called GlobalVetLINK hand drawn images are replaced with digital images uploaded into the Coggins form.
Luckily, with lots of hard work on behalf of veterinarians, laboratories, and state officials and due diligent horse owners, EIA is rather under control today, but there are still new cases of EIA discovered routinely. Also, there are many horses that do not receive testing, leading to possible reservoir of horses asymptomatically carrying EIA. Remember, even though it is sometimes inconvenient to get your horse’s Coggins test performed, you are doing your part to help control and prevent the spread of this terrible and incurable disease.
Read more great stories in the April 2020 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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