Equine
Umbilical Hernia
By Lauren Lamb
An umbilical hernia is a defect in the horse’s ventral body wall at the location of the umbilicus. The umbilicus is the equivalent of our belly button. The umbilicus is where the umbilical cord attaches to the foal while it is developing in the mare’s uterus. The umbilical cord is made up of a vein, two arteries and the urachus. The umbilical vein and artery carry blood to and from the fetus as it is developing in the uterus. The urachus is a tube that connects to the fetus’ bladder and carries urine from the developing fetus.
Umbilical hernias are seen in foals between the ages of birth and three months of age. The hernia bump seen on the bottom of the abdomen is made up of skin, subcutaneous tissue, peritoneum (lining of the abdomen) and a piece of the gastrointestinal tract.
Questions concerning umbilical hernias frequently asked by owners:
- How does an umbilical hernia develop?
- Are they genetic?
- How can I prevent an umbilical hernia?
Some evidence shows umbilical hernias may have a genetic component; however, the genetic influence is most likely mild. This means breeding a mare and/or stud that had an umbilical hernia when they were foals will not result in an offspring with an umbilical hernia. The flip side of the coin is also true; crossing a mare and stud with no history of umbilical hernias will not result in a foal without an umbilical hernia.
Some have a strong belief that foaling behavior of the mare immediately after delivery can have an influence on whether a foal will develop an umbilical hernia. The natural behavior of a mare following delivery of her foal is to remain lying down until the foal starts to move and becomes more active. This may take several minutes for the foal to become active. Once the foal becomes active, the mare will stand up and break the umbilical cord about one inch from the foal’s navel. When a mare stands prematurely, the risk of an umbilical hernia forming can be increased. The most common reason for a mare to stand prematurely is human intervention. When humans try to rush into the stall to assist the foal or mare, the mare will become nervous and stand up too early.
An umbilical infection can lead to an umbilical hernia. The post foaling care of the umbilicus can influence whether or not a foal will develop an umbilical infection. The umbilicus should be dipped in dilute Nolvasan solution or betadine solution two to three times a day for the first three days of life. An umbilical infection is likely to occur if the umbilicus is not dipped in an antiseptic solution for the first three days after birth.
The size of an umbilical hernia is measured in fingers, aka the number of fingers that will fit in the hernia. A small hernia is less than three fingers in size. A large hernia is anything bigger than three fingers in size. The hernia should not be painful on palpation, nor should there be any heat or swelling around the hernia. When you place your fingers in the hernia, the contents of the hernia should be easily reduced (pushed back into the abdomen). A veterinarian should be contacted as soon as possible if you notice any heat, swelling, pain on palpation or you cannot reduce the hernia. A veterinarian should also be contacted as soon as possible if a horse with an umbilical hernia starts to colic. All these clinical signs are evidence that a portion of the intestine is stuck within the hernia. When the intestine is stuck within the hernia, the blood supply to the intestine can be compromised, which will result in the intestine becoming necrotic—dead. The hernia should be checked daily to ensure none of the previously mentioned clinical signs have developed.
Several treatment options are available for hernias. One conservative treatment option for small hernias (less than three fingers), is to reduce the hernia one to three times a day. By reducing the hernia you allow the hernia ring (defect in the body wall) to heal close. When the foal reaches four months of age, there is little chance that the hernia will heal with conservative therapy. Any foal that is greater than four months of age with an umbilical hernia will need a surgery to repair the hernia.
An umbilical hernia has two surgical repair options—both require general anesthesia and can be performed in a clean stall or a surgery room. A hernia repair performed in a surgery room has lower complication rate following surgery.
The first surgical option is called the closed technique. With the closed technique, the abdominal cavity is not opened, but the skin and subcutaneous tissue are opened. The hernia is repaired by placing large sutures across the abdominal defect. The closed technique decreases the risk of an infection occurring within the abdomen, but it increases the risk that a portion of the intestine is sutured to the body wall. The closed technique is usually used in cases were the surgery is performed in a stall within the barn. In this location, there is higher environmental contamination compared to a surgery room.
The open technique is the second option. With the open technique the abdominal cavity is opened and large sutures are placed across the defect to close the hernia. With the open technique, the risk of the intestine being sutured to the abdominal wall are significantly decreased. The open technique should be performed in a surgery room.
Following surgery, foals are kept on stall rest with no hand walking for two weeks and then turnout in a small paddock or trap for an additional two weeks. After four weeks, foals are allowed to go back to regular turnout and exercise.
Umbilical hernias are abdominal wall defects that are commonly seen in foals. The cause of an umbilical hernia is not completely understood; however, both genetics and husbandry practice can contribute to a horse developing an umbilical hernia. Surgery is not always required to repair umbilical hernias unless the foal is over four months of age. At this age surgery is needed to repair the hernia. Following surgery, foals had a good prognosis.
Equine
What’s That Test For?
By Ann Asher
For many horse owners, a Coggins test is part of the routine. If you’re headed to a horse show, rodeo, sale, boarding facility or across state lines, you have likely been asked for a current negative Coggins. The veterinarian draws a tube of blood, fills out the paperwork and, assuming the result comes back negative, the form goes in the file with the rest of the horse’s records.
But what are we testing for?
A Coggins test is a blood test for equine infectious anemia, commonly shortened to EIA. It is not a general test for anemia, and it won’t tell you whether a horse’s red blood cell count is low. The test looks for antibodies the horse’s immune system has produced against equine infectious anemia virus.
EIA is a viral, bloodborne disease that affects horses, ponies, donkeys, mules and other equids. The virus belongs to the lentivirus group, a family of viruses known for persistent infections. Once a horse contracts EIA, it stays infected for life. No approved vaccine prevents the disease, and no treatment eliminates the virus from an infected horse.
That lifelong carrier status is why the Coggins test matters so much.
Some horses with EIA become seriously sick. Clinical signs can include recurring fever, weakness, weight loss, swelling, depression and anemia. In severe cases, the disease can kill. Many infected horses, however, show few signs or none. A horse can look healthy, perform normally and still carry the virus, putting other horses at risk.
EIA spreads through infected blood. Horse flies and deer flies are important natural carriers. A fly can feed on an infected horse, get interrupted and move to another horse while blood remains on its mouthparts. Contaminated needles, syringes, surgical or dental equipment and anything else that moves blood from one horse to another can also spread the virus.
That’s why controlling EIA takes more than keeping flies away. Use a new sterile needle and syringe for every horse, and clean and disinfect any equipment that could become contaminated with blood.
The name “Coggins test” refers to the agar gel immunodiffusion, or AGID, test developed to detect antibodies to EIA. The test identifies antibodies against an antigen associated with the virus. Today, laboratories may also use approved ELISA tests, which return results faster. Because ELISA tests occasionally produce false positives, labs confirm positive screening results with the AGID, or traditional Coggins, test.
Keep in mind that the test looks for the horse’s immune response to infection rather than the virus itself, so timing can matter. A horse infected very recently may not yet have enough antibodies to test positive. Most infected horses eventually develop detectable antibodies, but there can be a window after exposure when the test comes back negative.
For the average horse owner, the larger purpose of routine testing is surveillance. Testing helps find infected horses before they unknowingly expose other animals.
In Oklahoma, horses attending equine exhibitions such as fairs, shows, rodeos and racetracks must have a negative EIA test from within the previous 12 months. Oklahoma also requires testing when horses mingle in common settings such as boarding and training facilities, as well as before most changes of ownership. Horses entering Oklahoma generally must have a negative EIA test from within the previous 12 months as well.
Those requirements can feel like one more piece of paperwork, especially for owners who travel often and have healthy horses that test negative year after year. But the system works because testing is routine.
There is no vaccine to fall back on if EIA starts spreading through a group of horses, and no cure for the infected horse. A confirmed positive animal remains a carrier for life and must be managed under strict regulatory requirements, generally through euthanasia or permanent isolation from other equids.
So when your veterinarian pulls that tube of blood for another Coggins test, the goal is bigger than getting the paper you need at the gate of the next event. We are looking for evidence of a lifelong, contagious disease that can hide in a healthy-looking horse. Finding those horses before the virus spreads makes that routine blood test one of the simplest and most important tools we have for protecting the horse population.
Equine
A New Set of Challenges
By OKFR Staff
By the time September rolls around in Oklahoma, most of us are more than ready for rain. After weeks or months of dry weather, brown pastures and hard ground, a good soaking rain can seem like the answer to a lot of problems.
For our horses’ feet, the end of a drought can bring a new set of challenges.
During long dry spells, hooves lose moisture and can turn hard and brittle. Dry weather is one of the factors associated with hoof cracks, particularly when combined with long trimming intervals or hoof imbalance. Horses traveling over hard, dry ground also take more concussion, and horses with thin soles or tender feet can grow sore as the ground hardens.
That makes regular farrier care especially important during a drought. You may be tempted to stretch the time between appointments because the feet don’t seem to be growing as fast, but keeping the hoof trimmed and balanced reduces stress on the hoof wall and the structures that support it.
Watch for small cracks and chips before they become big ones. Minor chipping around the bottom of an unshod hoof is fairly routine. A crack that keeps moving upward, gets deeper or causes lameness deserves a closer look from your farrier or veterinarian.
Then comes the rain.
After a long dry spell, hoof moisture can change quickly when horses start standing in wet grass, mud or saturated ground. Going from dry to wet and back again can contribute to brittle hoof walls and cracking.
Wet conditions bring other concerns. Long exposure to moisture can soften the hoof, particularly the sole and frog. Mud and dirty footing favor problems such as thrush and give bacteria more chances to enter through small cracks or separations in the hoof. Hoof abscesses also commonly follow swings between very dry and very wet conditions.
The best defense isn’t complicated. Pick up your horse’s feet regularly and pay attention to what you see and smell. Clean out packed dirt, manure and mud, and watch for cracks, tenderness, a foul odor around the frog or changes in the white line. Give horses a place where they can get out of the mud and stand on clean, dry footing.
Talk with your farrier before trying to change hoof moisture with frequent soaking or a lineup of topical products. More moisture isn’t automatically better. The goal is a healthy, balanced hoof that can adapt to its environment.
Finally, don’t ignore sudden lameness after the weather changes. A hoof abscess can make a horse dramatically lame, sometimes overnight. Many abscesses heal well with proper treatment, but sudden or severe lameness warrants a call to your veterinarian.
We can’t control when Oklahoma’s next rain arrives. Staying consistent with hoof care before, during and after that change gives our horses the best chance of handling it soundly and comfortably.
Equine
More than Just a Saddle Pad
By Savannah Magoteaux
Walk past the horse trailers after a summer jackpot, ranch rodeo or trail ride, and you’ll probably see the same thing: saddle pads draped over gates, fences and trailer doors, drying in the afternoon sun. Some are soaked through with sweat. Others are already stiff with dried salt, caked hair and arena dust.
It’s easy to think of a saddle pad as one more piece of tack, but it has one of the hardest jobs on your horse. On every ride, it cushions the saddle, helps spread pressure across your horse’s back, absorbs sweat and lets heat escape.
A quality saddle pad can last for years if you take care of it.
Built-up sweat, dirt and hair shorten the life of a pad. Over time, they also compress the fibers, reduce the pad’s ability to wick moisture and create stiff spots that can rub your horse’s back. Even the best-made pad can’t do its job once it’s hard as a board.
One of the simplest habits you can develop is cleaning the pad after every ride. Knock off loose dirt, brush away hair and let the pad dry completely before putting it back in the tack room or trailer. Storing a damp pad invites mildew, odors and bacteria and breaks down many materials over time.
Every saddle pad serves the same basic purpose, but the material determines both how it performs and how you should care for it.
For many western riders, wool felt remains the standard. One of its greatest advantages is that it gradually conforms to the horse’s back without losing its structure. To care for a wool felt pad, remove hair with a curry comb or stiff brush after each ride and let it dry thoroughly. When it needs a deeper cleaning, use cool water and a mild wool-safe detergent if the manufacturer recommends one. High-pressure washers, harsh detergents and excessive heat can damage the wool fibers and reduce the pad’s performance.
Traditional woven wool blankets are still popular, particularly beneath ranch saddles or as a top blanket over a felt pad. Shake them out regularly, brush them clean and wash them gently when necessary. Most should air dry, since a dryer can shrink natural fibers.
Neoprene pads have become common because they’re durable, lightweight and easy to clean. Unlike wool, neoprene doesn’t absorb moisture. Many neoprene pads have textured or waffle-patterned surfaces that help move sweat away from the horse while letting air flow beneath the saddle.
You can rinse most neoprene pads with a hose after riding and wash them with mild soap now and then. Let them dry completely before storage, and keep them out of intense heat and direct sunlight, since neoprene can turn brittle over time.
Foam, gel and memory foam inserts show up in many performance pads designed to add shock absorption or relieve pressure points. These materials can cushion well, but many hold more heat than wool. Care varies considerably from one manufacturer to another, so follow the cleaning instructions that came with the pad instead of assuming all synthetic materials wash the same way.
Synthetic fleece pads are another common option, particularly for everyday riding. They are generally easier to clean than natural wool, and many can go through a washing machine on a gentle cycle before air drying. Regular brushing between washings keeps the fleece from matting and packing with hair.
Whatever type of saddle pad you choose, no pad can make up for a saddle that doesn’t fit. Even the thickest pad cannot eliminate pressure points created by a poorly fitting saddle. Think of the pad as a partner to proper saddle fit, helping protect your horse while the saddle does its job.
Before your next ride, flip your saddle pad over and run your hand across the side that rests against your horse. If it feels rough, stiff or crusted with dried sweat and hair, imagine how it feels after an hour in the saddle.
A few minutes spent cleaning and drying your pad after each ride will help it last longer, protect your investment and keep your horse more comfortable every time you swing a leg over.
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