Steaming Soaked Hay is Essential for Horses on Low Non-Structural Carbohydrate Diets

Soaking hay for 10 minutes can increase bacterial content by 150 percent; steaming that hay virtually eliminates fungi, yeast, bacteria and respirable particles.
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Steaming restores post-soak “diet” hay to a tasty state proven to be preferable to dry and, especially, soaked hay. It’s moist and soft, rather than soggy, and it has an appetite-inducing fragrance.

Steaming hay was developed primarily to improve equine respiratory health by removing dust and other inhalable irritants, but the process is gaining popularity for its essential role in treating hay for horses that need reduced non-structural carbohydrates in their diets. To be precise, NSCs are starch plus water-soluble carbohydrates, or WSCs.

Low-NSC diets are called for in conditions including insulin resistance, equine metabolic syndrome, equine pituitary pars intermedia dysfunction (also known as Cushing's disease), polysaccharide storage myopathy, laminitis and excess weight. Each condition requires different management. Insulin-resistant horses, for example, are typically prescribed a diet that contains less than 12 percent non-structural carbohydrates in their feeds.

Although soaking hay is the most effective way to significantly reduce the WSC component of NSC down to safer levels for these horses, confusion surrounds the process because it lacks proven protocols and has downsides many well-intentioned horse owners are not aware of.

Soaking leaches out important nutrients, as well as WSCs, to varying degrees depending on the length of the soak. It also creates an environment in which bacteria and mold, already present in some amount even in the best-quality hay, quickly grow. Even just a 10-minute soak has been proven to increase bacteria by a whopping 150 percent. Soaked hay is also just that—soaked hay. It’s wet, and a lot of horses don’t like the taste.

So, how can you continue soaking your hay for the horse that needs lower NSC while providing healthy, desirable nutrition? Here’s where hay steaming enters the picture.

Injecting steam into a purpose-built insulated chest, Haygain Hay Steamers bring the hay inside to at least 212° Fahrenheit, high enough to kill mold, bacteria and spores that survived or increased during soaking. Steaming restores post-soak “diet” hay to a tasty state proven to be preferable to dry and, especially, soaked hay. It’s moist and soft, rather than soggy, and it has an appetite-inducing fragrance that explains why veterinarians love it for getting post-surgery horses back on their recovery meal plan.

Steaming? Soaking? Or Both?

The answer to this question depends on your objectives. If reducing dust, mold, fungi, yeast, mites and/or bacteria is your primary goal, then steaming is the best option. Extensive Haygain studies at the Royal Agricultural University in Cirencester, England, determined that soaking hay dampens down 90 percent of respirable particles, while high temperature steaming reduces them by 98 percent. Both results are substantial, but there’s a huge difference in each method’s impact on bacteria and mold. Soaking for 10 minutes has been shown to increase bacterial content by 150%, and most people soak hay for much longer than that, often overnight for morning feedings or all day for the evening meal. Conversely, Haygain steamers have been shown to reduce all hay pollutants to virtually zero. To be specific: fungi and yeast to zero; viable bacteria by 99 percent; and respirable particles by 98 percent.

If you want to dramatically reduce the NSC level, then soaking is where to start. While steaming does slightly reduce NSC, one of its benefits is that it does not strip important nutrients from hay, so it’s not your stand-alone choice for horses that need low-NSC hay. Research studies determined a 3 percent loss of water-soluble carbs from steaming with Haygain, while soaking showed an average loss of 34 percent.

Steaming after soaking is the ideal one-two punch, assuring you of hay that’s free of soak-induced bacteria and respiratory irritants, while restoring the hay’s appealing texture and enhancing its fragrance.

Soaking: How-To

Inexact science is one source of confusion surrounding the soaking process. Because hay of different types, regions and harvesting dates has different constitutions, standard protocols for soaking to remove specific quantities of specific nutrients don’t exist.

Clair Thunes, PhD, an independent equine nutrition consultant, advises clients with horses who need special diets to soak hay for 30 minutes in hot water or 60 minutes in cold. The hay should be fully submerged during that time, then hung to drain for at least 10 minutes before feeding, but not much longer to prevent bacteria growth.

“I tell people to put it in a hay net before soaking, then hang the net above their soaking tub to drain,” she explained. “Often times the hay is going to a metabolic horse who is not getting that much hay in the first place, so the net can be useful for slowing down consumption and stretching out their meal time.”

Be careful with the soaking effluent, Thunes stressed. Especially in drought-prone California where her Summit Equine Nutrition is based, it’s tempting to dump the post-soak liquid near the barn. “Hopefully, people are putting that contaminated water into a proper drain so it’s not getting into any streams or other bodies of water.” A 1993 study published in Equine Veterinary Education showed that effluent from 12 hours of soaking hay was 10 times as strong as raw sewage, a big problem for responsible management of stable water run-off.

Another question is how much NSC is removed by soaking. An analysis of post-soaked hay is ideal, but not practical, for most horse owners, even for those who maintain horses at home stables rather than at public stables. Testing hay for quantities of protein, fibers, carbohydrates, fats and other nutrients is most practical when buying in bulk, but even then the nutrients can change or degrade over time.

If you do have your hay analyzed, make sure the results include the carbohydrates in their various forms. The most important carbohydrate forms for horses with metabolic issues are starch, water-soluble carbs and simple sugars. However, it’s good to know the quantities of other carbohydrate forms: acid detergent fiber, neutral detergent fiber and non-fiber carbs.

For most people managing horses with special feed needs, following a consistent soaking routine, with hay from the same source and monitoring its impact, is the best way to determine its effectiveness. Closely monitoring your horse is essential, notes Thunes. “If your horse has a history of laminitis, for example, watch for heat or discomfort in their feet, and check their digital pulse regularly.” There is a reliable pulse source located at the fetlock joint.

Reading the labels on any supplemental feed in your horse’s diet is equally important, Thunes added. Soaking to reduce NSC is pointless if the processed feed is loaded with it.

Determining a healthy, special-needs diet is a complicated endeavor, best done with the help of a nutritionist or veterinarian. The benefits of steaming hay, however, are a no-brainer, whether the hay is soaked or not. After a recent presentation by a Haygain consulting veterinarian, Thunes was impressed with the company’s research and the role that respiratory health plays in overall equine well-being. “It really is a limiting factor for horses,” she said. “You can condition the muscles, heart and the circulatory system, but nothing you do when conditioning them really improves their lung function.”

Hence the importance of protecting the respiratory system, and Haygain steamed hay is the simple solution for that.

Haygain is committed to improving equine health through scientific research, product innovation and consumer education in respiratory and other health issues. With offices in the USA and England, Haygain distributes products for healthier horses to 19 countries, including its Haygain Hay Steamers, ComfortStall Orthopedic Sealed Flooring System, Forager Slow Feeder and Flexineb Portable Equine Nebulizer. Visit www.Haygain.US for more information.