Equine
Fescue Toxicosis
With foaling season upon us it is important to discuss fescue grass and the negative impact it can have on late term gestation in broodmares. Fescue is commonly found in Oklahoma pastures and is known for being a durable, drought-resistant grass due to a symbiotic relationship with an endophytic fungus called Acremonium coenophialum (or Neotyphdium coenophialum). Research has found that over 85% of Oklahoma’s fescue grass has been infected by this endophyte. Unfortunately, there are no visual differences between regular fescue and infected fescue so horse owners cannot know if their mares are safe to continue grazing their pastures without further testing. Furthermore, there are no treatment regimens that will successfully remove the endophyte from the infected grass, so mare owners are best off if they remove the mares from infected pastures during the late stage of gestation.
The endophyte, Acremonium coenophialum, survives by living inside intercellular spaces on blades of fescue grass. Since it does not actually enter the host plant’s cells, it is unable to detect the ongoing infection and continues to grow and reproduce seeds that are also infected by endophytes. These infectious endophytes are responsible for producing various alkaloid toxins that benefit the grass in many ways. For example, peramine is an alklaoid toxin that has been proven to prevent the grass from insect damage. Experimental removal of these endophytes has produced “non-infectious” fescue that was shown to be more susceptible to root disease, insects and drought. The primary alkaloid toxin that horse owners should be concerned with is called ergovaline. Studies have shown that ergovaline can be found in every part of infected fescue grass but concentrates most in the seed heads.
When late term broodmares graze on infected fescue, they inevitably consume the ergovaline toxin, which can have negatives effects on hormone production and the progression of their pregnancy. Ergovaline will affect the mare’s anterior pituitary gland and cause a decrease in the secretion of prolactin, a hormone that is necessary for mammary gland development and milk production. Often, the only clinical sign of fescue toxicosis is the lack of an udder as the birthing date approaches. Researchers are also studying the effects ergovaline has on pituitary gland development in the fetus. It is possible this toxin also inhibits developments of the fetal anterior pituitary gland, which may help explain why foals from affected mares are stillborn or suffer from neonatal maladjustment syndrome (“dummy foal” syndrome).
Unfortunately, broodmares affected by fescue toxicity do not show many clinical signs before parturition begins so it is important that mare owners are carefully monitoring their udder development, particularly in the last 21 days of gestation. These mares will also commonly carry past their due dates because the toxin impacts the normal hormone signaling between the mare and the foal, which slows down the progression of the pregnancy. Some of these mares will abort or have stillborn foals, while others will struggle with dystocia because the longer gestational time will lead to foals that are enlarged or malpositioned and cannot pass through the birthing canal without assistance. These mares can also be more likely to a have thickened, edematous placenta and a higher rate of placental retention.
The best treatment for fescue toxicosis in mares is to avoid consumption of infected fescue during the late stages of her pregnancy. It is recommended that owners remove their mares from possible sources of infected fescue 90-120 days before their due dates. However, if the mare is allowed to graze on fescue, there are things that can be done to try and minimize the effects of the toxicity. Agalactia is the most common clinical sign of fescue toxicosis in mares so if owners notice that the mare is not developing an udder within the last two-three weeks before the due date, it is recommended that they start her on domperidone. Domperidone will counteract the effects ergovaline has on the pituitary gland and allow for serum prolactin levels to increase, which stimulates udder development and milk production. Mares that are not caught in time or not treated with domperidone will have no milk supply for their foal once it is born. Also, these mares will fail to produce any colostrum, which means the foals will be unable to obtain any antibodies from their mother and will need to be supplemented with colostrum from another mare or be administered intravenous plasma from a donor horse in order to have any immune function for the first several months of their life.
It is also very important these mares be monitored for prolonged gestation, which can be a warning sign for a possible dystocia. In these cases, mare owners should be prepared for the mare to have difficulties with parturition due to increased fetal size or fetal malpositioning. Any owner concerned about fescue toxicosis should speak with their veterinarian and have an emergency plan in place for foaling. It is often best these mares foal out in a hospital where immediate intervention can be provided if a dystocia does occur. Affected mares can also have thick, edematous fetal membranes, which can lead to abortion or stillborn foals due to placental insufficiencies at the end of the pregnancy. However, foals born alive can offer suffer from neonatal maladjustment syndrome, which can have varying degrees of severity. Some of these foals may be unable to stand while others may not have a strong suckle reflex or the ability to find and latch on to the mare’s teat. These foals will require a significant amount of intervention and supportive care in order to survive and begin to function normally.
Owners should be aware of fescue and the many negative impacts it can have on their mare’s pregnancies and foals. They are encouraged to seek veterinary advice as soon as possible if there are any questions or concerns about possible fescue toxicity in their mares. Early intervention can be the key to saving the mare and foal as well as a lot of money and potential heartache during foaling season.
Read more in the June 2020 issue of Oklahoma Farm & Ranch.
Equine
Trailer Safety Checklist
By Janis Blackwell
As the season arrives to gear up for participation in your equine event of choice, one thing remains a constant for all horse owners. That constant is our responsibility to insure the safety of our horses by being diligent to maintain the integrity of the trailers in which we haul them. There are a number of things that can be dangerous both inside and outside of your trailer. Whether you traveled all winter long or whether your trailer sat unused or was used very little through the cold weather months, at least once a year your trailer is due a thorough going over. So here we go with a checklist that will help you insure a happy and safe trip for you and your equine partner.
- A sound floor is absolutely imperative. Whether your floor is aluminum, steel or wood, it should be cleaned regularly after use to preserve it. Urine and manure will erode and weaken all types of floors. Even rubber mats will not prevent erosion of your floor. (Maintenance tip: remove mats and wash aluminum floors often to prevent erosion.)
- Especially check wooden floors for rotten boards. Immediately replace questionable flooring before hauling. (Maintenance tip: For wood, remove mats and wash out manure and debris. Coat wooden floor in a cheap motor oil. Allow to sit in hot summer weather until the oil soaks in. Be careful—floor will be slippery until oil cures into the wood. This treatment yearly will preserve a wooden floor for much longer than normal as it repels urine and protects the wood).
- Keep the interior and exterior washed to enable you to check for rusted out places, leaks, etc.
- Have a professional check your brakes at least once yearly to be sure they are operating properly.
- Be sure tires are inflated to the proper air pressure, and check the inside of each tire for hidden unusual wear that could cause a blowout. Replace worn tires before leaving home.
- Wheel bearings must be checked and packed at least once a year. This should be done even if the trailer has been rarely used since the last time the wheel bearings were packed. In fact, trailer maintenance professionals say that sitting stationary and unused is even worse for the bearings. Improper care and maintenance of wheel bearings can cause a wheel to seize up and actually twist off while in use. Use a horse trailer professional for this maintenance task.
- Axles should be checked for bowing. A bent or bowed axle can cause excessive tire wear and damage wheel bearings.
- There should be no more than two inches in height difference from the front of the trailer to the back. More difference than that causes the bulk of weight of the trailer and its contents to ride mostly on the rear axle causing it to bow and wear on both tires and wheel bearings.
- Another critical part of the trailer to keep an eye on are the butt chain or bar and the back door. The butt chain or bar should be firmly attached to the wall and its keeper and should always be latched. The door should have a strong secure latch with a pin to insure it stays latched while in motion.
- Finally, but certainly not of least importance is a thorough check of the trailer hitch including ball and coupling. Keep the ball well greased. Periodically, check to see that the ball is still securely tightened and the latch on the coupling is working properly.
These few critical safety check points can save you money, stress and the wellbeing of your horse. Until next time, happy trails and safe traveling.
This article was originally published in the April 2016 issue of Oklahoma Farm & Ranch.
Equine
Fly Control That Works: What’s Worth Your Money This Summer
By Ann Asher
Every year about this time, it feels like the flies start winning. No matter how clean I keep the pens or how many fly strips I hang, they show up in clouds. Over the past few summers, I’ve tried just about everything—feed-through supplements, predator bugs, DIY traps, and plenty of fly sprays. Some things helped. Some were a waste of money. If you’re battling flies this year, here’s what’s actually worked for me—and what research says can make a real difference on the farm or ranch.
Start with Cleanliness (But Know It’s Not Enough)
The first—and most repeated—advice is to stay ahead of the mess. Manure management is critical, especially around barns, pens, and loafing sheds. Flies lay eggs in fresh manure, and those eggs hatch into larvae in as little as 24 hours during warm weather.
I try to clean high-traffic areas at least every other day, but the truth is, even on the cleanest farms, flies can still be a problem because of moisture, standing water, and nearby neighbors.
Feed-Through Fly Control: A Solid Foundation
One thing that made a noticeable difference for my horses and cattle was starting a feed-through larvicide early in the season. These products add a growth regulator to the feed that passes through the animal and prevents fly larvae from developing in manure.
It’s not an instant fix—you won’t see fewer flies for several weeks—but once it kicks in, you’ll notice fewer new flies being born.
Tip: Feed-through products only work if all animals on the property are eating it consistently. Otherwise, you’re just treating part of the manure, and flies will keep breeding.
Fly Predators: Small, Mighty, and Surprisingly Effective
Last year, I tried fly predators for the first time. These are tiny, non-stinging insects that lay their eggs in fly pupae, stopping the next generation.
I was skeptical (and honestly a little creeped out at first), but I noticed that where I used predators around the barn and dry lots, the fly pressure dropped. Some companies even offer subscription services that send predators timed to your local climate.
Tip: Fly predators don’t kill adult flies—they stop future flies. So you still need to control the adults already buzzing around.
Good Old-Fashioned Fly Traps
In areas like the barn aisle and outdoor runs, nothing beats physical traps.
I like a combination approach:
- Sticky ribbons and strips for indoor areas
- Odor-baited traps placed away from livestock areas to draw flies away
Tip: Hang baited traps a good distance from barns or stalls. Otherwise, you’re luring flies right into your animals’ space.
Fly Sprays: Choose Carefully
Fly sprays are the first thing most of us reach for—and they do help—but they have limits.
For horses, sprays containing pyrethrins, pyrethroids (like permethrin), or natural oils tend to offer the best repellency. Even then, most sprays only last a few hours, especially if animals are sweating heavily.
Tip: Apply before morning turnout and again before evening if possible. Reapplication is important, especially after heavy exercise or rain.
Other Tools That Help
- Fly masks and fly sheets — particularly those with UV protection, to protect sensitive areas like the eyes and ears
- Fans in barns and run-in sheds — flies struggle to land in strong airflow
- Automatic sprayer systems — an investment, but highly effective for larger barns
The bad news? There’s no magic bullet for fly control.
The good news? Combining several methods—manure management, feed-through treatments, predators, traps, and targeted sprays—can actually make summer bearable for you and your livestock.
At the end of the day, I figure if I can cut the fly population by half, I’ve already made life better for my animals—and a lot less miserable for myself.
References:
- Texas A&M AgriLife Extension – Managing Flies on Livestock
- University of Kentucky Entomology – Controlling Flies Around Livestock
- North Carolina State Extension – Livestock Pest Management
- USDA Agricultural Research Service – Fly Management Resources
- Spalding Labs (for info on biological control programs) – Fly Predators Information
Equine
History of the Horseshoe Part 1
If it were not for the horseshoe and wagon wheel, the United States would not have been founded, according to Lee Liles. The owner of the National Museum of Horse Shoeing Tools and Hall of Honor said Oklahoma is the grandest example in the world.
Horseshoe books date back to 400 B.C. In fact, the oldest horseshoe at the museum in Sulphur, Okla., is more than 500 years old from Denmark.
“I don’t like going back much farther than 1860 because we don’t have the documentation to back it up,” Liles explained. “You got a few magazines like the Harper Weekly and the Wallaces’ Report, but you want to verify the facts.”
19th Century Patents
The first patent on a horseshoe manufacturing machine in the United States was issued in 1834 to Henry Burden, a Scottish-born industrial engineer. By 1850, Burden had more than 50 different patents on his machines at Burden Iron Works in Troy, N.Y., Liles added.
This was all before the first horseshoe nail patent, which was issued in 1863 to Daniel Dodge in Keeseville, N.Y. The horseshoe nail is the most difficult nail in history to manufacture, Liles explained.
“It’s got a lot of different tapers to it,” he explained. “The nail needs to be strong and durable enough to drive through a foot, come out, be turned over 180 degrees and clenched down in the horse’s foot.”
The nail industry has changed a lot throughout the years, Liles said. In 1853, the horseshoe nail was made from Swedish Iron, but copper nails have become popular in recent years. The oldest nail company left in the United States was the Capewell Horse Nail Company owned by the Mustad family. The nail company started in 1881, and they recently moved out of the country.
“All of these major shoe companies, tool companies and nail companies were located in the northeast United States,” he explained. “That’s where the population was. There weren’t any companies located down here in the South like Oklahoma or Texas.”
Horseshoeing Literature
Most information on horseshoeing actually came from Germany, Liles explained. German books were first written in 1861 by Leisring and Hardman. In 1882, Lungwitz was added as a co-writer.
“[Leisring, Hardman and Lungwitz] were the main vets at the Royal Veterinary College,” Liles said. “[Hardman] wrote his own first book in 1884 and wrote 24 editions. Nobody else has ever written that many books.”
Liles said books are the greatest assets for education. In 1866, the U.S. Congress adapted the cavalry books would be written on the Dunbar System.
“Alexander Dunbar was a person who our Federal Government paid to teach anatomy to horseshoers back in that era,” Liles explained.
John Kerman, who was running a horse shoeing school at Fort Carlisle, Penn., wrote the book written on the Dunbar System. The first American horseshoe book was written in 1871. In 1902, Kerman came to the shoeing school at Fort Riley, Kan.
“The cavalry has been the main source of horseshoers in this country up to the 1950s,” Liles said. “The Army technical manual, TM-220, has been the most copied horseshoeing book in history.”
In the 1890s, Pennsylvania State recruited Mississippi-native, John Adams as a professor. The university sent Adams to Germany to study under Lungwitz.
“When he came back in about 1896, he and Lungwitz were such good friends that he had permission to write the American edition of the Lungwitz book,” Liles explained. “When he came back, Adams brought an instructor from Germany to Penn State to teach anatomy and horseshoeing to the vet students.”
Even Cornell University and Michigan State University had a protégé of Lungwitz in 1913, Liles said.
William Russell
“We had a great educator in Cincinnati, Ohio, who wrote 15 horseshoeing books from 1879 to 1907,” Liles explained. “His name was William Russell.”
In 1887, the first shoemaking contest was held in Cincinnati, Ohio, where Russell won. “The contest consisted of making 100 shoes on an opry stage in front of 3,000 spectators,” Liles explained.
Russell made 100 horseshoes in two hours and 40 minutes with the help of a team. John Silk, who later became a famous horseshoer, was one of Russell’s competitors.
In the 1890s, many horseshoers, including Russell, created display cases filled with their horseshoes. Many of these display cases are still intact and hanging in the museum. One of the cases was in the World Fair in St. Louis in 1904.
“When it went to the World Fair, they added nails to the case,” he added. A photo of the case at the World Fair was added into one of Russell’s books, and it was one of the last display cases he made. Russell offered all of his collection for sale in the same year.
“He died in 1907,” Liles explained. “He was a sick man, and he was blind when he died.”
Aluminum Horseshoe
Liles also has a case located at the museum built in 1895 had an aluminum horseshoe inside. “That is very rare,” he said. “In that era, they only produced 65 pounds of aluminum per year. Aluminum was a precious metal, and you had to buy it through a jeweler.”
Liles said he does not think the aluminum held up well to wear and tear. William Wedekind received the title, “The World’s Greatest Horseshoer” at the 1892 Chicago World’s Fair. Wedekind even made an aluminum horseshoe in 1883.
“It was so light that it floated on water,” Liles explained. “They can’t duplicate the shoe today to make it float on the water.”
The Right Shoe
Liles said when people come to museum, they are used to dealing with one breed of horse and one discipline with the horse. The type of horseshoe used depends on the breed and the discipline. “In this country, we have roughly 400 different breeds of horses,” Liles said.
Liles said he was a horseshoer, which is a lot different from a cowboy shoer. For instance, a horse that is going to go trail riding or ranching needs a high-quality steel horseshoe.
A show horse will wear aluminum shoes because the aluminum will wear the toe quicker. “It will give him a quicker time to break that shoe in,” he added. “If your shoe isn’t new at the show, he has to get that shoe back to where it feels comfortable.”
Many of the plastic shoes are meant for horses that are on concrete, asphalt or wood. Liles said plastic shoes are commonly used in the circus.
A common misconception is people think the weight of the horseshoe affects a horse in either racing or working. “They think plastic is so much lighter,” he explained. “If that is the case, why don’t you just ride him barefoot?”
To learn more about the history of the horseshoe, visit www.horseshoeingmuseum.com.
This article was originally posted in the July 2016 issue of Oklahoma Farm & Ranch.
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