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Teff: A Beneficial Forage For Easy-Keepers And Metabolically Challenged Horses

Teff may seem like an overnight success for some in the horse industry. However, teff has been a cultivated forage in the U.S. for some time. So why has teff become so popular and where does it best fit in the horse's diet?

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.

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Study: Intense Exercise Affects More Than Just Muscles

Scientists in Poland have discovered that intense exercise changes the amount of bacteria in a horse's digestive system. Exercise limits the amount of oxygen intestinal mucosa receives, which could stimulate bacterial growth in the digestive system so that more nutrients can be metabolized.

Drs. Wanda Górniak, Paulina Cholewińska, Natalia Szeligowska, Magdalena Wołoszyńska, Maria Soroko and Katarzyna Czyż used seventeen 3-year-old racehorses in training at Partynice Race Course for their study. All the horses were fed the same forage and were trained with only trot and canter work. The team asked the horses to race just over a mile (1,900 meters), and took fecal samples before and 48 hours after the work. The horses had not been worked at speed for two weeks prior to the study.

When comparing the bacteria in the fecal samples, the scientists found a significant increase in both Firmicutes and Bacteroidetes bacteria in all samples taken after the horses worked at speed, but they noted that each horse responded differently. This indicates that each horse may respond individually to exercise.

The changes in bacteria may allow for the diet, intensity, and quantity of training of racehorses to be adapted as a whole. The discovery of individual bacterial responses to exercise may lay the groundwork for specifically tailored diet and conditioning programs to improve horse health and the individual's ability to adapt to exercise.

Read the study here.

Power Down The Protein: What A Horse Eats Impacts The Air

Though changing what a horse eats may seem an odd thing to adjust for air quality, research has shown that reducing the amount of protein in a horse's diet can protect his respiratory health. Protein is broken down into nitrogen in the horse's small intestine and then excreted as urea, which becomes ammonia in a horse's stall.

Ammonia can irritate nose and lung tissue, causing excess mucus production and respiratory issues like heaves. Drs. Jessie Weir-Chouinard, Hong Li, Lori Warren and Erica Macon created a study that fed nine horses forage-based diets with three different levels of protein. The highest-protein diet was 12 percent.

The study horses wore harnesses that collected their urine, which was then combined with wood shavings or straw and tested for ammonia levels. Study results showed that the higher-protein diets led to significant increases in nitrogen levels in urine. Straw bedding had higher levels of ammonia emissions than shavings no matter the diet. Shavings absorbed more of the urine, and ammonia, than the straw did.

The scientists concluded that lowering the protein in a horse's diet can decrease the amount of ammonia in his stall. This, coupled with cleaning stalls regularly and thoroughly, can combat ammonia and help keep horses airways safe. Proper ventilation is also key.

Study: Diet Change Imperative For Ulcer Resolution In Horses

When a horse begins ulcer treatment, the way he is managed is often scrutinized; alleviating stress will hopefully mitigate ulcer recurrence. A new study out of Denmark shows that management changes alone may not be enough—adjustment to the horse's diet should also be investigated.

A low-starch diet can be beneficial for a horse that has gastric ulcers, but diet as a whole is often overlooked when ulcers medication is prescribed. Dr. Nanna Luthersson created a study to highlight the necessity for diet adjustment.

Luthersson used 58 horses that were diagnosed with ulcers. The horses were divided into two groups based on the severity of their lesions: 24 horses had moderate lesions, graded as 1 or 2 out of 4, and 34 horses had severe ulcerations, determined to be a 3 or a 4. The horses were placed into pairs based on similarities in diet, feeding times, management and workload.

At the beginning of the study, the horses with severe ulcers were placed on omeprazole, but the other horses were not. Additionally, one horse out of each pair was put on a low-starch feed that was fed three times a day instead of twice a day.

After four weeks, the omeprazole treatment was stopped, but the assigned diets continued; researchers examined each horse with an endoscope and graded their lesions. Six weeks later (10 weeks after the study began), the horses again received endoscopic exams and had their lesions graded.

Horses with severe ulcers had a significant reduction in lesions between the start of the study and when the omeprazole ended. However, those horses that received the reduced-start diet sustained the lesion improvement for the entire 10 weeks. Horses that did not have their diets changed returned to their same lesions score by week 10 even though they had received the omeprazole treatment. This means that these horses received no long-term benefit from the omeprazole.

Luthersson concluded that adjusting a horse's diet is imperative for long-term management of a horse that is ulcer prone. Though some ulcers heal with diet change alone, she notes that treatment and diet change may necessary for horses with more-severe lesions.

Red more at EQUUS magazine.

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