In what types of feeds was beet pulp first used?

Sugar beet pulp first found a use in commercial horse feeds in the racehorse products as a low-dust feedstuff because it was mixed with lots of molasses and felt moist. This proved beneficial for the respiratory tract and was thought to be somehow beneficial in preventing bleeding, though this notion was quickly abandoned.

Beet pulp was also integrated into senior feeds because of the need for a high-fiber feedstuff that could be ground and incorporated into a pellet. The new generation of high-fiber, low-starch feeds that emerged in the late 1990s was an obvious end-use for such an excellent fiber source. Now, beet pulp is prevalent in feeds designed for all classes of horses.

What are the differences between beet pulp and cereal grains as energy sources?

Horses derive the majority of the energy (calories) in cereal grains from the enzymatic digestion of starch that is absorbed in the bloodstream in the form of glucose. On the other hand, horses derive the majority of the energy in beet pulp from the microbial fermentation of the fiber content, which is absorbed as volatile fatty acids, also known as short-chain fatty acids.

What are the advantages of feeding beet pulp as part of a diet?

Compared to other fiber sources like hay, beet pulp has much more digestible fiber. For example, the digestible fiber in hay is around 40 percent, while beet pulp has closer to 80 percent digestible fiber. The more digestible the fiber, the more calories that feedstuff provides the horse.

Further, beet pulp mixes well into a textured feed and can be pelleted easily. Plus, soaking beet pulp is a way to get more water into the horse.

How does beet pulp stack up to hay as a source of fiber?

The type of fiber found in beet pulp, considered “rapidly fermentable fiber,” is much more readily fermented by the microbes in the hindgut than the fiber in hay or typical forage sources. Hay consists mostly of cellulose, hemicellulose, and lignin. While lignin is completely indigestible, cellulose and hemicellulose vary in digestibility depending on the maturity of the plant.

Beet pulp provides energy, but does it add appreciable amounts of other nutrients?

Beet pulp has higher amounts of calcium than grains, about the level found in typical commercial concentrates. In addition, beet pulp is comparatively high in iron.

Should beet pulp be fed soaked or unsoaked when fed by itself or as part of home-mixed concentrate? 

If feeding beet pulp shreds, they can be fed dry, especially if mixed with other feedstuffs. Free-choice water availability is important if feeding dry beet pulp. Pelleted beet pulp, however, should not be fed dry because it may increase the likelihood of choke. Horses prefer to consume beet pulp shreds soaked rather than dry shreds, probably because it softens their texture. My preference is to feed beet pulp soaked.

Further, one of the advantages of feeding soaked beet pulp is that it is a way to sneak a bit of water into the diet, especially in the winter when water consumption may be down. The Europeans have come up with a method of micronizing and then flaking the pulp so that it soaks quickly, in less than 10 minutes.

Are there any special uses for beet pulp?

Soaked beet pulp is a useful vehicle for holding larger amounts of oil, which is often recommended as a way to get more calories in the horse.

It was thought for a while that soaked beet pulp could help to push sand out of the digestive tract, but research found it ineffective in prevention of sand colic.

Is beet pulp use in the U.S. different than in other areas of the world?

Beet pulp has worked its way into quite a number of commercial feeds in the U.S. Many horse owners feed soaked beet pulp in addition their regular feed.

As the history of beet pulp would suggest, its use is more longstanding in areas such as England, Northern Europe, and Russia, where much sugar beet is cultivated. Because of the climate needed for sugar beet cultivation, South America had very limited sugar beet production, as was the case in Australia and Africa. However, cultivation is expanding to newer areas because of a variety that can be grown in the warmer climates as a winter crop, instead of a summer crop as it is in more temperate climates.  Where beet pulp is not grown, it may be imported and therefore rather expensive.

Are you interested in how beet pulp became a feedstuff for horses? Learn more at Beet Pulp in Horse Feeds: A Brief History.

Could beet pulp be an appropriate feedstuff for your horse? Contact a Kentucky Equine Research nutrition advisor today.

Article reprinted courtesy of Kentucky Equine Research (KER). Visit equinews.com for the latest in equine nutrition and management, and subscribe to The Weekly Feed to receive these articles directly (equinews.com/newsletters).   

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The question that looms large for most owners is when to offer alternative forage. The pasture reveals a couple of important clues, namely growth rate and plant health.

Owners will know when pasture growth slows as there will be less need for routine mowing and maintenance. Depending on stocking rate—that is, the number of horses on any given acreage—pasture might withstand a slowdown in growth rate and continued grazing, so long as more land is allotted per horse. A large, seven-acre paddock that comfortably sustained five horses in peak growing season might support three as pasture growth declines.

“Observation of grazing behavior might be a tipoff, too. If horses spend more time grazing, they are likely finding less to eat. In periods of lush growth, you might catch horses resting more often, as it is easier for them to satisfy their appetites and their need to graze,” said Dr. Kathleen Crandell, a nutritionist with Kentucky Equine Research (KER).

Plant health is a more obvious indicator. As autumn segues into winter or as rainfall decreases, pasture grasses often turn brown and unpalatable, at which time growth is almost assuredly arrested. Horses will snack on these remnants, but more nutritious forage should be offered.

“Owners ought to offer hay as soon as they feel horses are not consuming sufficient pasture to meet daily forage requirement, which is about 1.5-2 percent of body weight daily,” advised Crandell.

For a 15.2-hand, 1,100-pound horse, that would be 16.5-22 pounds of hay each day. Keep in mind, though, that this amount will likely satisfy the horse's complete forage requirement.

“If the horse is still nibbling away at pasture much of the day, it might need only a portion of this. If the horse leaves hay in favor of pasture, then too much hay is probably being fed at the time. Gauge requirement through consumption,” recommended Crandell.

To maintain weight, many horses, in combination with their forage, will be consuming a well-fortified concentrate feed that supplies all of the protein, vitamins, and minerals required for their well-being. Those that do not should be fed a vitamin and mineral supplement, such as Micro-Max, developed by Kentucky Equine Research and available in the U.S. and other regions. Micro-Max supplies minerals that have been chelated or proteinated, which increases their digestibility and allows horses to derive maximum benefit from them.

One vitamin that is particularly deficient in diets composed of preserved forages such as hay is vitamin E, an important antioxidant in the horse's immune arsenal. The most effective source of supplemental vitamin E is d-alpha-tocopherol or natural vitamin E. Nano-E is a natural-source vitamin E supplement that possesses a unique delivery action, nanodispersion, which allows the vitamin to hit target tissues more quickly than other vitamin E supplements. Nano-E is available worldwide.

Don't know where to begin with supplementation? Complete a simple questionnaire and start the consultation process.

Article reprinted courtesy of Kentucky Equine Research (KER). Visit equinews.com for the latest in equine nutrition and management, and subscribe to The Weekly Feed to receive these articles directly (equinews.com/newsletters).   

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Scientists from the University of Helsinki surveyed the owners of 47 horses that had cheek teeth surgically removed because of root infections. Tooth root infections can be caused by several things, but most of these removals were the result of dental fractures.

The survey asked 23 questions of these owners regarding horse behavior. Respondents noted that the behaviors that were eliminated after the surgical tooth extraction included dropping hay, eating slowly and adjusting hay in the mouth while chewing.

Before surgery, horses with dental pain often avoided the bit, raising their heads or getting “behind” the bit to avoid contact. Painful horses also behaved more antisocially toward people and horses. All of these behaviors dissipated when the painful tooth was removed.

Dr. Jaana Pehkonen, lead researcher, said that avoiding the bit was the most common indicator that something was amiss. She notes that this may be because this behavior is easiest to notice.

In half the study horses, tooth infections were not discovered until a routine dental exam took place, indicating that many owners miss behaviors that can be linked to dental pain. Only six of the 47 horses had obvious signs of tooth issues like external swellings or sinus drainage. Nearly all the owners said that their horses were more comfortable after the teeth were removed.

Pehkonen concluded that some equine behaviors, like self-mutilation, aggressive behavior or withdrawnness aren't regarded as pain behaviors by horse owners. However, once the pain is removed and the horse returns to acting “normal,” it's easier to see that the behaviors indicated discomfort. Pehkonen recommends horses have annual dental exams so that any problems can be identified.

Read more at EQUUS magazine.

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Mild EA, the preferred term that replaces inflammatory disease, describes horses with a chronic low-grade cough (defined as having gone on for longer than three weeks), decreased/poor performance, and the presence of tracheal mucous when the horse is scoped. Many underlying conditions can be confused with EA. Those include infectious causes (viral or bacterial), upper airway obstruction (dorsal displacement of the soft palate, for example), and exercise-induced pulmonary hemorrhage. Some veterinarians have even speculated that those conditions may even predispose horses to mild EA.

“The most important factor contributing to mild EA in Thoroughbreds is the small dust particles horses breathe in primarily as a consequence of feeding dry hay,” explained Dr. Laurent Couëtil, section head of Large Animal Internal Medicine at Purdue University, in West Lafayette, Ind.

Dry hay contains fungi, molds, mite debris, inorganic particles, endotoxins, and other inflammatory molecules. This microscopic particulate matter contaminates the horse's breathing zone, causing inflammation in the lower airways.

“Particulate matter measuring less than 4 microns in diameter results in a sharp and significant increase in the number of neutrophils in mucus collected from the lungs,” said Couëtil.

Particles this small cannot be seen to the naked eye but can be measured with specific, wearable equipment fastened to a horse's halter.

Mucus — a hallmark of EA — can easily be collected from horse's lungs via bronchoalveolar lavage (BAL) and microscopically analyzed. The presence of neutrophils in this BAL fluid indicates inflammation. Other inflammatory cells may also be appreciated, such as mast cells and eosinophils.

The amount of tracheal mucous, which can be scored on a scale ranging from 0 (no excess mucous) to 5 (defined as a profuse amount pooling throughout the trachea) can also be used to gauge the severity of mild EA.

According to Couëtil, studies in both Standardbred and Thoroughbred racehorses have demonstrated an association between severity of mucus score and poor performance. As mucous scores increase, speed of the horse decreases.

“A 2006 study performed by Sue Holcomb showed that horses with tracheal mucous scores of 2 or greater were significantly behind in finishing place than horses with a score of 0 or 1,” Couëtil relayed.

Because forage is the most important source of dust that triggers EA, various tactics designed to minimize dust have been explored. Recently, Couëtil and colleagues conducted a study at an Indiana Thoroughbred racetrack. They demonstrated that racehorses actively involved in training and competition that were fed steamed hay or haylage had reduced exposure to dust by approximately 30% when compared to horses fed dry hay.

In that study, Couëtil's team recruited 69 Thoroughbreds and divided them into three groups based on type of forage fed: haylage, steamed hay, and dry hay. All horses were fed this diet for a total of 6 weeks. On weeks 0 (baseline), 3 and 6 of the study, endoscopy was performed after coming back from the track to assess respiratory function and to grade mucous. In addition, all horses were equipped with sensors to measure respirable particles (less than 4 microns in diameter) for 3 hours after returning from training and being fed.

Haylage is grass that is cut and baled at a higher moisture content (about 30%) than regular hay (about 15%) and is package in sealed plastic films similar to shavings bales. This packing prevents molding of the moist forage and allows preservation of the nutritional value of fresh grass similarly to what is achieved with silage for cows. This moist forage results in a marked decrease in dust exposure when horses eat haylage. For the purposes of this study, trainers were each given a hay steamer provided by Haygain.

Key findings of the study were:

• Respirable dust particles (less than 4 microns in diameter) were significantly higher in the breathing zones of horses fed hay. Both the steamed hay and haylage generated the same, significantly lower level of dust particles;
• By the end of the study, mucous scores were significantly higher in the hay group. Both the steamed hay and haylage groups had the same, significantly lower mucous scores;
• BALF analysis showed that the number of neutrophils, an indicator of airway inflammation, increased significantly as the respirable dust concentration in the horse's breathing zone increased; and
• Over time, the number of neutrophils in BALF decreased in horses fed steamed hay and haylage but only reached statistical significance for horses fed haylage.

“In sum, our results clearly demonstrated the benefits of feeding low-dust forages on airway health in just 6 weeks,” Couëtil concluded.

Another conclusion that Couëtil highlighted was that BAL can be performed safely in Thoroughbred racehorses without interruption in racing or training.

“For some veterinarians, owners, or trainers, the idea of a BAL can be off-putting,” Couëtil said. “Many veterinarians are not familiar with the procedure, and others think that a BAL will require resting their horses for an extended period of time after infusing fluid in the lungs.”

The reality is that even if only 50 percent of the sterile saline solution administered is recovered, the rest is rapidly absorbed. Couëtil's study proved that a BAL can be performed without interfering with the training and racing schedules.

“Owners and trainers shouldn't hesitate to perform a BAL in any case of chronic cough, poor performance or when excess mucus is seen by endoscopy after the race,” Couëtil said. “This test can be highly beneficial especially when used in conjunction with the mucous score. The BAL rules in mild EA while endoscopy can help rule out other causes of cough and poor performance.”

One caveat worth noting is that medications are sometimes used for sedating the horse and to decrease coughing during BAL, and it is important to respect drug elimination times prior to racing.

In sum, identifying realistic ways of decreasing airway inflammation, such as a small change in hay preparation, is important because an estimated 80% of Thoroughbred racehorses have mild EA and are not living up to their potential.

Dr. Stacey Oke is a seasoned freelance writer, veterinarian, and life-long horse lover. When not researching ways for horses to live longer, healthier lives as athletes and human companions, she practices small animal medicine in New York. A busy mom of three, Stacey also finds time for running, hiking, tap dancing, and dog agility training. 

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It is often a lack of knowledge about selecting quality hay that gives horse owners a bad name and forces them to pay more for hay than their neighbors with other types of livestock. Myths develop because of a piece of truth that becomes inflated and held as absolute truth without justification. To improve our knowledge of hay selection, here are a few common myths about hay, how these myths came to be accepted and, finally, “the truth.”

Note: For the purposes of this article, “high quality hay” refers to hay with a high nutritive value.

Myth: Second cutting hay is always the best cutting.

How it came about: The number one factor that determines hay quality is stage of maturity at harvest. Cool season grasses such as orchardgrass and timothy will produce a seedhead in the spring, often just in time for the first cutting. For the hay producer, this means an increase in yield and therefore more bales can be harvested and sold. However, this also means that fiber is elevated in the crop, therefore reducing quality. Because seedheads are only produced one time per year in cool season grasses, subsequent cuttings do not contain them and second or later cuttings will be generally less fibrous as a result. Second cuttings tend to cure more quickly and are less likely to experience rain damage; both contribute to higher quality relative to first cutting.

Truth: First cutting hay can be high quality if cut early and second cutting can be low quality if it cut late. Stage of maturity and other management factors affect hay quality at harvest. High quality (or low quality) hay can be harvested from late spring to late fall if weather and management conditions are right. Quality should never be assessed based on cutting number, but on a laboratory-performed analysis.

Myth: Horses require higher quality hay than cattle.

How it came about: Some horses, especially those with high nutrient requirements, do require higher quality hay than cattle. Horses and cattle have very different digestive tracts. Cattle are ruminants and are able to breakdown fiber very efficiently, whereas horses are monogastrics with a functional large intestine (hindgut fermenters) and are less efficient at fiber digestion. Therefore, cattle can perform well on lower quality hay that horses cannot digest well.

Truth: Individual needs of the animal should dictate the quality of hay provided. An easy-keeping Quarter Horse in light work does not need the same quality of hay as a Thoroughbred at the peak of its racing career. Similarly, an open Angus cow does not need the same quality of hay that a high producing dairy Holstein needs at the peak of lactation. Consider the current body condition, level of work and pasture availability of your horse. Then choose hay that will meet the needs of your horse without excess based on a hay test.

Myth: (Fill in the blank) is the best type of hay.

How it came about: Statements such as this often come from horse owners that have moved from one area of the country (or world) to another and are not accustomed to the local hay. Different forages are adapted to different soils and climate conditions, so the most common hays available for horses vary among regions.

Truth: Hay quality is not about the forage species or even the variety. Forage species used for hay will fall into one of two categories: grasses or legumes. Grasses can include orchardgrass, Kentucky bluegrass, tall fescue, bermudagrass, timothy, teff and smooth bromegrass. Legumes include alfalfa, red and white clover, lespedeza and birdsfoot trefoil. When managed and harvested correctly, legumes will be higher in quality than grasses; however there will be little difference between different grasses or between different legumes when all other factors are held constant. Buying quality, local hay will likely save money due to reduced transportation costs. Make sure to address any concerns with a specific grass or legume species, such as endophyte infected tall fescue. If you are concerned about feeding a certain species of hay, ask your local county extension agent or equine nutritionist about it.

Myth: Forage stored as round hay bales or as silage contain diseases such as botulism and should not be fed to horses.

How it came about: The botulism bacterium prefers moist conditions and is commonly found in the soil, in stream sediments and in the intestinal tracts of fish and mammals. Silage (haylage) by definition is stored with higher moisture than hay, and when not properly handled, can allow the botulism bacterium to flourish. Hay that is conserved in large round bales is usually baled at a similar (often lower) moisture content as small square bales and thus is different than haylage. However, if round hay bales are stored outside, they can get wet from rain, encouraging the growth of bacteria and mold.

Truth: Proper storage, handling and feeding of round hay bales will minimize the risk of botulism in horses. Round hay bales should be covered when stored and fed using a hay feeder to reduce contamination from trampling and urination. Round bales that show clear signs of mold should not be fed to horses. Feeding silage to horses is much more common in other countries than in the U.S. Silage should be put up at the proper moisture content for the style of storage, kept airtight until feeding and fed quickly to reduce the risk of botulism. Silage should always be tested for forage quality before feeding. In botulism prone areas, a veterinarian should be consulted about the use of silage and the inclusion of a vaccination against botulism to protect horses.

Myth: Don't feed hay that has been rained on.

How it came about: Rain negatively affects hay in a variety of ways:

Rain on recently cut hay can prolong plant respiration and reduce energy content.

Rain on legumes will cause leaves to separate from the stems (called leaf shatter) and therefore remove the more nutritious portion of the plant. Fibrous stems will then be more concentrated in the final product, causing a decrease in quality.

Rain will also cause leaching of sugar and other carbohydrates, proteins and minerals.

Heavy rain can splash soil up onto curing hay, which can increase dustiness and rapidity of molding.

Truth: Rained on hay can be acceptable quality. While rain usually negatively affects hay, to what degree depends on several factors, including what type of hay is being harvested, how much/how intense the rain fell, stage of curing when it rained and what the producer has done to counteract these negative effects. For example, if light rain occurs within a day of cutting, it has very little effect on hay quality. All hay, especially material that has been rained on should be tested for quality and inspected for mold or dustiness before use.

Myth: Hay should be stored for six weeks before feeding.

How it came about: This myth likely came about from hay testing. After hay is stored in a barn, it will continue to cure for four to eight weeks. During this curing period, the quality of the hay can change slightly.

Truth: Hay can be fed at any time after harvesting. Hay should not be tested until it has been stored for six to eight weeks to increase the accuracy of the hay test. While feeding hay sooner will not be harmful to horses, it will be difficult to balance the ration because the quality of the hay is unknown.

Myth: Green is good; brown is bad.

How it came about: Often, hay that has been harvested too late or mishandled will lose its green color due to processes such as heating and bleaching. Green hay is less likely to have gone through these processes and more likely to be of quality.

Truth: A hay test is the only way to truly evaluate quality. No quality factors directly affect color or vice versa. Therefore, color is an inconsistent factor to evaluate the quality of hay.

Myth: Feeding hay causes a large, distended digestive tract, known as a hay belly.

How it came about: Hay belly usually results when malnourished horses are provided large quantities of low quality, high fiber hay. The horse will usually be thin over the neck, withers, ribs and hindquarters; however the belly will appear large because the horse is consuming large amounts of hay.

Truth: A balanced ration that includes quality pasture or hay will maintain a horse at an ideal condition without excessive gut fill.

It is important to remember that horses evolved consuming forage, and whether in the form of pasture or hay, is an important component in the equine diet. Choosing hay for your horse will depend on your horse's current condition, work level, pasture availability and the logistics of management on your farm. Hay should always be inspected and found to be free from contaminants such as weeds, insects, mold, dust and other foreign material. The nutritional value of the hay should also be evaluated prior to feeding so that a ration can be formulated that will meet the needs of your particular horse.

Read more here. 

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A study, funded by Haygain Ltd. and spearheaded by Dr. Simon Daniels from the Royal Agricultural University, has shown that steaming hay with near-boiling water preserves its “haybiome,” a new term that encompasses the diverse good and bad bacteria found in hay. A healthy haybiome includes a variety of bacterial species, but the beneficial bacteria outweigh the disease-causing bacteria.

Haygain had no role in the design, data collection, or analysis of the study.

Researchers genetically sequenced samples of four types of ryegrass and meadow hay. Samples were either soaked for 12 hours in water at 61 degrees Fahrenheit or steamed for one hour in a commercial steamer that reached 203 degrees Fahrenheit for at least 10 minutes. The two other sequenced samples were left dry.

The scientists concluded that beneficial bacteria were present in the hay after both steaming and soaking, but the soaked hay didn't have the abundance of bacteria the steamed hay had. Soaked and dry hay contained bacteria that could cause dental and respiratory disease.

Additionally, a blue-green algae that is toxic was found in the dry hay that was sampled. Steaming eliminated the toxin completely, but soaking simply transferred the toxin to the water.

Read more at The Horse.

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Teff is an annual, warm-season grass that many believe originated from Ethiopia, where it was cultivated as a grain crop for human consumption. Teff is fine-stemmed, fast-growing, high-yielding, seems adaptive to numerous environments, and tends to thrive in warmer, drier conditions. However, teff's nutrient profile is what makes it attractive to many in the horse industry.

Compared to cool-season grasses and legumes, teff tends to be higher in fiber values and lower in nonstructural carbohydrates (NSC) and digestible energy (DE). This nutrient profile makes it an appealing option for horse owners with “easy-keeping” horses, over-weight horses, or horses diagnosed with Equine Metabolic Syndrome (EMS), laminitis, Pituitary Pars Intermedia Dysfunction (PPID), or Polysaccharide Storage Myopathy (PSSM).

These horses tend to require total diets lower in NSC and DE, making teff a desirable option. Elevating teff's popularity and demand is the rate of obesity and related issues (e.g. EMS and laminitis) in the horse population. Similar to human and companion animal populations, obesity in the horse population is estimated at 30 percent, requiring many horse owners to seek lower caloric feedstuffs. However, what does research say about fitting teff into horse diets?

Researchers at the University of Minnesota have explored the impact of horses grazing teff. They found that teff produced less season-long yield compared to alfalfa and perennial ryegrass, primarily due to less grazing events. Since teff is a warm-season grass, it must be planted later in the spring in northern climates when soil temperatures are warmer and is more easily killed by cooler fall nights compared to cool-season grasses.

Teff was confirmed to have higher amounts of fiber and lower amounts of NSC, DE, and crude protein (CP) compared to cool-season grasses and legumes. The combination of higher fiber values, which tend to slow intake, and lower NSC values have been reported to decrease the glucose and insulin response in horses. Similar to humans, maintaining a more level (or homeostatic) insulin response is thought to be desirable to overall health, especially in horses diagnosed with metabolic diseases like EMS.

Researchers found that blood glucose and insulin values of horses grazing teff, cool-season grasses, and legumes were not different in the spring and summer; however, they were lower when horses grazed teff in the fall and late fall (September and October) compared to horses grazing cool-season grasses.

Fall grazing tends to be a risky time for horse diagnosed with metabolic diseases, or with a history of laminitis, as warm days and cool nights can lead to spikes in NSC concentrations in cool-season grasses. Although teff was lower in DE, if consumed at 2.5 percent bodyweight on a dry matter basis daily, it did meet the DE requirements of adult horses at maintenance.

Additionally, when a more detailed amino acid analysis was conducted, researchers found that while alfalfa and cool-season grasses had greater concentrations of most amino acids, horses grazing teff had similar blood amino acid responses compared to the other forages. This suggested that the lower CP values found in teff were not detrimental to the mature, idle grazing horses. Finally, teff did tend to have a slightly inverted Ca:P ratio, making it essential to test teff for forage nutritive values and supplement Ca when necessary.

Several universities have also explored harvesting teff as hay and adult horse preference. When harvested under ideal weather conditions and maturity, most describe teff hay as fine-stemmed and leafy. However, like any forage, environmental conditions, maturity at the time of harvest, and production practices can greatly impact forage quality.

In a hay preference trial conducted at Penn State, horses unaccustomed to teff preferred both mature alfalfa and timothy hay over teff hay. However, many agree that once acclimated to teff, most horses will readily consume teff. A Kentucky study investigated the intake of teff hay cut at three different stages of maturity (boot, early, and late).

Based on voluntary intake, horses preferred boot (1.8 percent bodyweight) and early-maturity (1.7 percent bodyweight) teff hays over late maturity hay (1.5 percent bodyweight). Similar to what is observed in grazing research and with other forages, maturity can be a major factor in palatability and intake.

In the Kentucky study, nutrient requirements for mature horses eating the less mature teff hays were generally met, although when consuming the late-maturity teff, DE and CP requirements were not met for adult horses at maintenance.

Collectively, research on grazing teff and feeding it as hay confirmed it can be used as a horse forage, but is more suitable for horses with lower energy demands or horses prone to metabolic concerns. While teff's niche in the horse industry is most likely as a forage for “easy-keeping,” overweight, laminitic or metabolically challenged horses, there are some drawbacks and frustrations horse owners have anecdotally shared.

Because of the higher fiber values and lower NSC, some horses simply refuse to eat the forage. This is not surprising as past research has shown preference and intake are positively linked to NSC amounts and negatively linked to fiber values. In these cases, owners should provide part of the diet in teff, while including other more palatable forages.

Like any newer forage, there is also a learning curve in planting, harvesting, and feeding the forage. A few challenges shared by hay producers include successfully planting the small-seeded forage, timely harvests, ideal cutting frequency of the mostly prostrate growing forage, and lack of labeled herbicide options. Finally, research is needed to establish if horses can be successfully maintained long-term on only teff forage, and a vitamin and mineral supplement.

Sign up for the University of Minnesota e-newsletter here.

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Drs. Jaclyn Willette, Dipti Pitta, Nagaraju Indugu, Bonnie Vecchiarelli, Meagan Hennessy, Tamara Dobbie and Louise Southwood found that the bacterial population of a horse's gut changes if he has been without food for at least 10 hours.

Chronic gastrointestinal disease leads to a decrease in variety of bacterial species in the gut of humans and cattle; the same is thought to be true for horses.

The bacteria in a colicking horse's gut is distinctly different from that in a healthy horse's gut. While this could be related to intestinal problems and inflammation that is leading to the colic epsiode, other factors could be at play, including withholding feed, which is an essential tool in managing a horse with colic.

The study team used eight mares for a crossover study that withheld nearly all feed for 24 hours and then allowed each horse free-choice timothy hay for 24 hours. The horses had access to water at all times.

The researchers found that bacteria richness and diversity were significantly lower 10 to 24 hours after the fast began. This limited bacterial population persisted for 2 to 12 hours after the horses were given access to hay. The horse's gut returned to normal 18 to 24 hours after the hay was reintroduced.

The team concluded that the effect of withholding feed should be considered when interpreting data on species and amount of gut bacteria in horses. Their findings may help locate markers that will lead to the development therapeutic interventions for horses that are colicking.

Read the study here.

Read more at HorseTalk.

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Reduced lignin and conventional alfalfa were fed to six adult horses, and included a 5 day total fecal collection period, during which horses were housed in individual box stalls and manure was removed on a continuous 24-hour basis. At 12-hour intervals, manure was mixed, frozen, and processed for sequencing to evaluate the microbiome.

Reduced lignin alfalfa did not shift microbiome composition equally across all horses; however, each horse's microbiome responded to hay lignin content in an individualized manner. Horse-specific associations between individual gut microbiome traits and characteristics of the digested alfalfa were also observed, mainly in regards to dry matter digestibility and average fecal particle size. These findings emphasize the importance of considering individual and historical factors when designing or evaluating feeding programs for horses. Future research should focus on uncovering what these individualized microbiome patterns mean from a functional perspective and physiological response of horses to feed. More information on this research can be found by reading the abstract.

Sign up for the University of Minnesota e-newsletter here.

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The Monday session is presented by members of the Rutgers Cooperative Extension Animal Ag/Field and Forage Working Group, Melissa Bravo and Hank Bignell. It will focus on assessing hay quality, weeds and weed control, and hay testing. Register for the Monday webinar here.

The Tuesday session investigates what hay is best for horses and what to feed ruminants in winter. This session is presented by Rutgers Equine Extension Specialist Dr. Carey Williams and Animal Science Extension Specialist Dr. Mike Westendorf. Register for the Tuesday event here.

Both webinars are free, but preregistration is required.

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