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Mannanoligosaccharides (MOS) - Feed Ingredient

Mannanoligosaccharides (MOS) are complex carbohydrates derived from the cell walls of Saccharomyces cerevisiae yeast. They are classified as prebiotics, meaning they serve as a food source for beneficial gut microbes rather than being directly digested by the horse. MOS contains mannose-rich sugar structures that can interact with gut bacteria.

In equine nutrition, MOS is included in feed formulations and supplements to support digestive health. It may help promote a balanced gut microbiome by reducing the attachment of undesirable bacteria to the intestinal lining. MOS is commonly used in feeds for young, stressed, or performance horses where gut health and immune function are a priority.

The following equine feeds, supplements and products contain Mannanoligosaccharides (MOS) as an ingredient.

Feeds, Supplements & Products
AminoTrace+ Vitamin and Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Metabolic SyndromeMetabolic Syndrome
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
AminoTrace+ by Mad Barn is a complete, balanced equine mineral and vitamin supplement designed for horses with metabolic concerns. It is ideal for horses with IR, PPID, or high iron in the diet.
Optimum Digestive Health Pellets (Mad Barn)
DigestionDigestion
Feed EfficiencyFeed Efficiency
Gut HealthGut Health
ProbioticProbiotic
Optimum Digestive Health from Mad Barn is a probiotic and prebiotic supplement designed to support hindgut health in the horse. It helps to maintain a stable microflora and promote immune health.
Visceral+ (Mad Barn)
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
ProbioticProbiotic
UlcersUlcers
YeastYeast
Visceral+ by Mad Barn is a pelleted supplement to be used for horses with gastric health concerns. It is designed to maintain stomach and hindgut health and to support the immune system.
Senior Feed Balancer (TopSpec)
JointsJoints
NutritionNutrition
Ration BalancerRation Balancer
SeniorSenior
Senior Feed Balancer from TopSpec is a ration balancer intended for senior horses and ponies. This balancer contains 10g of glucosamine per day to support joint mobility.
Senior Lite Feed Balancer (TopSpec)
JointsJoints
NutrientsNutrients
Ration BalancerRation Balancer
SeniorSenior
Senior Lite Feed Balancer from TopSpec is ideal for senior horses prone to weight gain. This ration balancer contains glucosamine to support joint health in horses and ponies.
SHAPE-UP (Saracen Horse Feeds)
Easy KeeperEasy Keeper
FiberFiber
Gut HealthGut Health
MetabolismMetabolism
Saracen Shape-Up is a balanced ration intended to help maintain normal body condition for easy keepers in moderate work.
SmartCombo Senior Ultra (SmartPak)
Gut HealthGut Health
Hoof HealthHoof Health
JointsJoints
SeniorSenior
SmartCombo Senior Ultra is a pelleted supplement intended for senior horses containing glucosamine, chondroitin sulfate, hyaluronic acid, MSM, biotin, omega 3 fatty acids, probiotics, prebiotics, and digestive enzymes.
SmartCombo Ultra Pellets (SmartPak)
Coat QualityCoat Quality
Hoof HealthHoof Health
JointsJoints
YeastYeast
This supplement made for horses by SmartPak is meant to support the health of hooves, joints, coat, and digestion. It is pelleted and contains yeast.
SmartDigest Ultra Pellets (SmartPak)
DigestionDigestion
HealthHealth
HindgutHindgut
NutritionNutrition
SmartDigest Ultra Pellets from SmartPak is a pelleted gut health supplement. SmartDigest Ultra Pellets are formulated with probiotics, prebiotics, and Diamond V® yeast culture intended to promote healthy digestive function.
SmartDigest Ultra Powder (SmartPak)
DigestionDigestion
Gut HealthGut Health
HealthHealth
NutritionNutrition
SmartDigest Ultra Powder from SmartPak is a pelleted gut health supplement. SmartDigest Ultra Powder is formulated with probiotics, prebiotics, and Diamond V® yeast culture intended to promote healthy digestive function.
SmartGut Pellets (SmartPak)
DigestionDigestion
Gut HealthGut Health
ProbioticProbiotic
UlcersUlcers
SmartGut Pellets is a gut supplement intended to neutralize gastric acid and maintain optimal stomach health. This supplement provides prebiotics, probiotics, and soluble fibre to support a healthy stomach lining.
SmartGut Ultra Pellets (SmartPak)
Gut HealthGut Health
HindgutHindgut
ImmunityImmunity
NutrientsNutrients
SmartGut Ultra Pellets from Smart Pak is a pelleted gut supplement. SmartGut Ultra Pellets are intended for horses with occasional gastric problems. This supplement is formulated with slippery elm intended to soothe the gastrointestinal tract in horses.
SmartImmune Pellets (SmartPak)
HealthHealth
HerbHerb
ImmunityImmunity
NutritionNutrition
SmartImmune Pellets from SmartPak is a pelleted equine supplement. SmartImmune Pellets is formulated with astragalus, ginseng and golden root intended to support immune function in horses. This supplement is intended to help horses manage stress.
Soothe & Gain (Allen & Page)
DigestionDigestion
FiberFiber
HindgutHindgut
NutritionNutrition
Soothe & Gain from Allen & Page is a high-energy feed which is high in fibre. Soothe & Gain is intended for horses and ponies who are prone to ulcers and digestive upsets. Soothe & Gain is free from barely, molasses, alfalfa and soy.
Stay Cool (Keyflow Feeds)
IngredientIngredient
Low NSC FeedsLow NSC Feeds
PrebioticPrebiotic
ProbioticProbiotic
Stay Cool from Keyflow has no added molasses with added prebiotics and probiotics to support horses’ digestive system. Stay Cool is an extruded feed with a low feeding rate.
Stock Builder (Star Milling Co)
ExerciseExercise
GrowthGrowth
MuscleMuscle
ProteinProtein
Stock Builder by Star Milling Co is a high protein supplement formulated with ingredients such as soybean meal, ground cereal grains and whey. It contains a minimum of 25% protein and no added minerals and vitamins.
Stud Cubes (Dodson & Horrell)
Amino AcidAmino Acid
HealthHealth
NutritionNutrition
StallionStallion
Stud Cubes by Dodson & Horrell is a feed designed specifically for fertility and fetal development. This feed includes an elevated level of vitamin E and an elevated protein level to aid in the increased metabolism rate.
Stud Feed Balancer (TopSpec)
Amino AcidAmino Acid
Ration BalancerRation Balancer
StallionStallion
YeastYeast
Stud Feed Balancer from TopSpec is a ration balancer for stallions, broodmares, and youngstock. This ration balancer contains amino acids to support muscle growth and yeast to support gut health.
Stud Lite Feed Balancer (TopSpec)
BroodmareBroodmare
GrowthGrowth
Ration BalancerRation Balancer
StallionStallion
Stud Lite Feed Balancer from TopSpec is ideal for broodmares, foals, young stock, and stallions. This ration balancer supports fertility, growth, and overall health in easy keepers.
Stud Muesli (Dodson & Horrell)
BroodmareBroodmare
LactationLactation
NutritionNutrition
StallionStallion
Stud Muesli by Dodson & Horrell is a textured feed designed specifically for fertility and fetal development. This feed includes an elevated level of vitamin E and an elevated protein level to aid in the increased metabolism rate.
Super Concentrated Senior Balancer (Blue Chip Feed)
Gut HealthGut Health
Hoof HealthHoof Health
ImmunityImmunity
SeniorSenior
Super Concentrated Senior Balancer from Blue Chip Feed is designed to support digestive, hoof, coat, immune, and respiratory health. This balancer is intended for senior horses and ponies.
Super Concentrated Ulsa-Cool Balancer (Blue Chip Feed)
Gut HealthGut Health
Hoof HealthHoof Health
Ration BalancerRation Balancer
YeastYeast
Super Concentrated Ulsa-Cool Balancer from Blue Chip Feed is intended for any horse or pony at any level of exercise. This balancer is designed to support hoof health, immunity, and coat condition.
Suregrow (Dodson & Horrell)
BroodmareBroodmare
FoalFoal
GrowthGrowth
StallionStallion
Suregrow by Dodson & Horrell is a ration balancer meant to provide all the required vitamins and minerals, high protein content, and lower starch content for proper growth. This feed also includes elevated vitamin E and biotin levels to support reproduction and hoof growth.
SynBioVit (TRM)
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
YeastYeast
SynBioVit from TRM is a supplement for horses containing live yeast Saccharomyces Cerevisiae, probiotics and yeast. SynBioVit can be used during times of stress, or for horses with poor hindgut health.
Synergy (Thunderbrook)
Gut HealthGut Health
HealthHealth
HerbHerb
ImmunityImmunity
Synergy from Thunderbrook is a concentrated feed intended for all types of horses. Synergy contains prebiotics, herbs, and botanicals intended to support gut health.
TransiFlora (Sollio Agriculture)
DigestionDigestion
Gut HealthGut Health
HealthHealth
ImmunityImmunity
TransiFlora is a powdered supplement intended to help maintain intestinal microflora. This supplement contains a blend of prebiotics, essential oils, yeast extract and botanical extracts intended to support horses's digestive tract.
Velocity (Ark Nutrition)
Complete FeedComplete Feed
ExerciseExercise
NutritionNutrition
ProteinProtein
Velocity by Ark Nutrition is a pelleted feed intended for horses in moderate to heavy work. It contains a blend of essential amino acids and fatty acids meant to support muscle development and improve muscle recovery.
Vermont Blend Pro (Custom Equine Nutrition)
Gut HealthGut Health
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
Vermont Blend Pro is a forage balancer and hoof supplement with added yeast cultures. It uses organic sources of copper and zinc. It has a lower feeding rate than the original Vermont Blend.
Vermont Blend Pro No Selenium (Custom Equine Nutrition)
Amino AcidAmino Acid
Gut HealthGut Health
Hoof HealthHoof Health
Ration BalancerRation Balancer
Vermont Blend Pro No Selenium by Custom Equine Nutrition is a supplement containing no added selenium intended for horses with diets that already contain adequate amounts of this trace mineral.
Veteran Light (Allen & Page)
DigestionDigestion
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Veteran Light from Allen & Page is a low-energy pelleted feed that is high in fibre with a low NSC content (8.5%). Veteran Light is a palatable horse feed with added probiotics.
Veteran Vitality (Allen & Page)
DigestionDigestion
IngredientIngredient
NutritionNutrition
SeniorSenior
Veteran Vitality from Allen & Page is a palatable feed for horses with poor dentition. This feed is high in fibre and includes added vitamins and minerals. Veteran Vitality contains herbs such as mint, nettle, dandelion, garlic, and fenugreek.
Zorien Gold (Novus)
Feed EfficiencyFeed Efficiency
Gut HealthGut Health
PrebioticPrebiotic
YeastYeast
ZORIEN® Gold is a yeast-based feed additive used as a prebiotic ingredient in livestock diets. It is a source of mannan oligosaccharides (MOS) and beta-glucans.

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