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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.
‘L’ Mix (Allen & Page)
Complete FeedComplete Feed
FiberFiber
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
'L' Mix from Allen & Page is intended for horses and ponies with laminitis. This feed contains 5.25% NSC, 30% fibre, and 8.5% protein.
10% Racepower Cubes (Dodson & Horrell)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
NutritionNutrition
PerformancePerformance
10% Racepower Cubes is a feed designed for racehorses or horses in training requiring a lower protein and starch content. It includes fibre to help with digestion, vitamins and minerals to help with nutrient absorption, and yeast for optimal gut function.
14% Racepower Cubes (Dodson & Horrell)
Competition HorsesCompetition Horses
ExerciseExercise
NutritionNutrition
PerformancePerformance
14% Racepower Cubes is a feed designed for racehorses and horses in training requiring a higher protein content and a lower starch content. It includes fibre to help with digestion, vitamins and minerals to help with nutrient absorption, and yeast for optimal gut function.
14% Racepower Muesli (Dodson & Horrell)
Competition HorsesCompetition Horses
FiberFiber
GrainsGrains
PerformancePerformance
14% Racepower Muesli is a feed designed for racehorses and horses in training requiring a higher protein content and a lower starch content. It includes fibre to help with digestion, vitamins and minerals to help with nutrient absorption, and yeast for optimal gut function.
AgriMune DP (Dispersible Powder) (Agri Feed International)
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
YeastYeast
AgriMune DP is a gut health supplement for agriculture species that provides prebiotics and probiotics. It contains mannanoligosaccharides, beta glucans, and yeast culture.
All-In-One (TopSpec)
FlavorFlavor
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
All-In-One from TopSpec is a caramel-flavoured supplement for horses and ponies prone to laminitis. This supplement supports hoof health, bone integrity, immune function, and gut health.
Antilam (TopSpec)
Easy KeeperEasy Keeper
NutrientsNutrients
NutritionNutrition
Ration BalancerRation Balancer
Antilam from TopSpec is a palatable ration balancer ideal for horses and ponies prone to laminitis. Antilam contains 20% fibre, supporting digestive health, and 30mg of biotin to support hoof health.
Apple Smacks Horse Treats (Star Milling Co)
Caloric EnergyCaloric Energy
GrainsGrains
NutritionNutrition
ProteinProtein
Apple Smacks by Star Milling Co is an apple-flavoured treat designed to be fed in small amounts as a special treat. It contains no less than 14.0% protein and is fortified with minerals and vitamins.
B-100 Breeding (Royal Horse)
BroodmareBroodmare
GrowthGrowth
HealthHealth
StallionStallion
B-100 Breeding from Royal Horse is a pelleted feed intended for broodmares, foals, and stallions. B-100 Breeding is intended to promote digestive well-being in horses. This feed contains 16.5% protein and 4.5% fat.
B-150 Breeding (Royal Horse)
BroodmareBroodmare
GrowthGrowth
HealthHealth
StallionStallion
B-150 Breeding from Royal Horse is a textured feed intended for broodmares, foals, and stallions. This feed contains 17% protein and 5% fat. B-150 Breeding is intended to support horses' reproductive system and encourage foal development.
Breed & Grow (Dunstan)
BroodmareBroodmare
FiberFiber
FoalFoal
GrowthGrowth
Breed & Grow by Dunstan is a high fibre pellet intended to provide nutrients to pregnant and lactating mares and young horses.
C-200 Horse Supplement (Royal Horse)
Feed EfficiencyFeed Efficiency
HealthHealth
NutritionNutrition
Ration BalancerRation Balancer
C-200 Horse Supplement from Royal Horse is a pelleted supplement intended for horses fed cereals and forages. C-200 Horse Supplement is intended to improve digestive function in horses.
Calm & Condition (Allen & Page)
FiberFiber
IngredientIngredient
NutritionNutrition
Weight IssuesWeight Issues
Calm & Condition from Allen & Page is a high-energy feed that is high in fibre. Calm & Condition contains added vitamins, minerals and probiotics. Calm & Condition is free from barely, molasses and alfalfa.
Calmer (TopSpec)
CalmingCalming
Competition HorsesCompetition Horses
PerformancePerformance
StressStress
Calmer from TopSpec is a caramel-flavoured supplement ideal for anxious horses and ponies or during stressful situations such as showing, travelling, and competing. This supplement contains yeast, B vitamins, magnesium, and tryptophan.
Calminex (Basic Equine Nutrition)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
VitaminsVitamins
Calminex is marketed as a calming supplement that contains tryptophan, thiamin, niacin, and magnesium. It also contains yeast and prebiotics for gut health. This supplement may be beneficial for horses easily stressed or at a high performance level.
Complete Horse Pellet (Ace Hi Feeds)
Complete FeedComplete Feed
FiberFiber
Mineral BalanceMineral Balance
NutritionNutrition
Complete Horse Pellet by Ace Hi Feeds is an alfalfa-based complete feed intended for adult horses. It contains added vitamins and a blend of organic and inorganic minerals. This high fiber feed is intended for mature horses
Comprehensive Feed Balancer (TopSpec)
Gut HealthGut Health
Hoof HealthHoof Health
Ration BalancerRation Balancer
YeastYeast
Comprehensive Feed Balancer from TopSpec is a palatable and pelleted ration balancer. This ration balancer contains yeast to support digestive health and biotin to support hoof health. This feed is ideal for horses and ponies of any age or work level.
Convalescent Muesli (Dodson & Horrell)
Complete FeedComplete Feed
DigestionDigestion
GrainsGrains
RecoveryRecovery
Convalescent Muesli by Dodson & Horrell is intended for horses and ponies at rest or in recovery. It contains yeast to support digestion and gut health and QLC antioxidants for immune support.
Cool & Collected (Allen & Page)
Easy KeeperEasy Keeper
IngredientIngredient
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Cool & Collected from Allen & Page is high in fibre and is recommended to be fed soaked. Cool & Collected contains added probiotics and linseed.
Cool Gut (DAC)
DigestionDigestion
Gut HealthGut Health
PrebioticPrebiotic
StressStress
Cool Gut by dac is a gastric health supplement intended to support horses in exercise and training.
Creep Pellets (Dodson & Horrell)
FoalFoal
GrowthGrowth
Gut HealthGut Health
NutritionNutrition
Creep Pellets by Dodson & Horrell is a feed designed specifically for foals and weanlings, with appropriate levels of vitamins and minerals for proper development. This feed also includes ingredients like milk powder, elevated protein levels, and digestive aids to support an optimal diet and transition to grain.
DailyWerks HD (HorseTech)
Hoof HealthHoof Health
JointsJoints
PerformancePerformance
Ration BalancerRation Balancer
DailyWerks HD by HorseTech is a powdered ration balancer intended to support hoof and joint health in horses in heavy work.
DailyWerks LD (HorseTech)
HealthHealth
Hoof HealthHoof Health
JointsJoints
Ration BalancerRation Balancer
DailyWerks LD by HorseTech is a daily ration balancer intended to provide hoof and joint support.
Digestive Aid (TopSpec)
Gut HealthGut Health
HindgutHindgut
StressStress
YeastYeast
Digestive Aid from TopSpec supports overall digestive health in horses and supports an increased appetite. This supplement is ideal for performance horses and senior horses.
Digestive Support (Dodson & Horrell)
DigestionDigestion
Gut HealthGut Health
HindgutHindgut
NutrientsNutrients
Digestive Support from Dodson & Horrell supports the horse's digestive system by promoting an average population of bacteria in the hindgut. This supplement contains herbs such as mint and fenugreek.
Donkey Forage Balancer (TopSpec)
Coat QualityCoat Quality
NutritionNutrition
Ration BalancerRation Balancer
YeastYeast
Donkey Forage Balancer from TopSpec contains yeast and is ideal for donkeys and mules. This ration balancer supports hoof health, skin condition, gut health, and a healthy coat.
Duraglow (Hestevard)
ImmunityImmunity
NutrientsNutrients
Omega 3-6-9Omega 3-6-9
Skin + HairSkin + Hair
Duraglow by Hestevard is a pelleted supplement intended to support a healthy skin and coat in horses and ponies.
Elite Sport Muesli (Dodson & Horrell)
GrainsGrains
MuscleMuscle
NutritionNutrition
PerformancePerformance
Elite Sport Muesli by Dodson & Horrell is a feed designed for the top performer; it includes benefits such as prebiotics and probiotics for gut health, amino acids for muscle building, and added vitamin E. This feed also consists of organic antioxidants and a low NSC level of 12.5%.
EquiMoss Liberté (Nature Belisle)
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
YeastYeast
EquiMoss Liberté is a pelleted digestive supplement for horses containing Mannanoligposaccharides (MOS), Fructo oligosaccharides (FOS), and live yeast cultures. It is formulated to be fed at a rate of 100 grams per day for a 500 kg mature horse.
Equine Aged/Adult Diet (Ace Hi Feeds)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
NutritionNutrition
SeniorSenior
Equine Aged/Adult Diet by Ace Hi Feeds is intended for mature or senior horses. It is available with or without molasses and contains added vitamins and minerals. This is a textured feed meant to be fed alongside a forage.
EquiZyme (Bio-Nutrition Laboratories)
HealthHealth
Mineral BalanceMineral Balance
PrebioticPrebiotic
VitaminsVitamins
EquiZyme from Bio-Nutrition Laboratories is a vitamin-mineral supplement. This supplement contains added manno-oligosaccharides, selenium and yeast cultures intended for horses in various performance levels.
Exceed 6-way (MVP)
Coat QualityCoat Quality
Gut HealthGut Health
Hoof HealthHoof Health
JointsJoints
Exceed 6-way from MVP is intended for joint, gastric, muscle, coat, hoof, and digestive health support. Some of the active ingredients include hyaluronic acid, MSM, biotin, zinc, copper, amino acids, probiotics, prebiotics, and a variety of herbs.
Exceed 6-Way Pellet (MVP)
JointsJoints
Mineral BalanceMineral Balance
MuscleMuscle
Omega 3-6-9Omega 3-6-9
Exceed 6-Way is a pelleted horse supplement containing MSM, glucosamine, hydrolyzed collagen, and yucca schidigera extract. It is formulated to support joints, hoof health, gut, and hair coat.
Fiber Fusion (Dodson & Horrell)
FiberFiber
ForageForage
NutritionNutrition
ProteinProtein
Fibre Fusion is a supplemental fibre feed meant to help support digestive function as it contains prebiotics and probiotics. This feed includes a moderate level of protein and ingredients such as sainfoin, alfalfa, and grass for added palatability.
Fibre Balancer (Dunstan)
GrowthGrowth
Low NSC FeedsLow NSC Feeds
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
Fibre Balancer by Dunstan is a semi-concentrate feed, intended for young growing horses that have access to high quality forage.
Fibre Grow (Dunstan)
BroodmareBroodmare
FiberFiber
FoalFoal
LactationLactation
Fibre Grow by Dunstan is a low-starch, high-fibre pellet intended to meet the requirements of pregnant and lactating mares as well as young growing horses.
Fibre Plus (Dunstan)
Bone HealthBone Health
Complete FeedComplete Feed
FiberFiber
GrowthGrowth
Fibre Plus by Dunstan is a high fibre, low starch pelleted feed intended to meet the nutrient requirements of young growing horses.
Gastro pHix (Bluebonnet Feeds)
Bone HealthBone Health
Gut HealthGut Health
HealthHealth
HindgutHindgut
Gastro pHix from Bluebonnet Feeds is a pelleted supplement that is meant to support proper pH levels in the horse's stomach. It can also help with the health of the intestines and bones.
Gastro-Plex Pellets (MVP)
ColicColic
DigestionDigestion
Gut HealthGut Health
YeastYeast
Gastro-Plex Pellets by MVP is a pelleted supplement that intends to aid digestive function. It contains antioxidants, probiotics and herbs that intend to help support stomach tissue lining and may ease discomfort.
Gastrowell (Probiotech)
Gut HealthGut Health
PerformancePerformance
ProbioticProbiotic
UlcersUlcers
Gastrowell by probiotech is a supplement intended to help alleviate discomfort from gastric ulcers in performance horses.
Golden Age – Senior Horse Ration (Kelley’s Feed)
Caloric EnergyCaloric Energy
FiberFiber
NutritionNutrition
SeniorSenior
Kelley's Golden Age Senior is a pelleted feed containing fine ground alfalfa hay and pre-cooked extruded grain nuggets for mature and aged horses. It provides 14% protein, as well as added vitamins and minerals.
GroCare Balancer (Red Mills)
BroodmareBroodmare
GrowthGrowth
NutritionNutrition
Ration BalancerRation Balancer
GroCare Balancer from Red Mills is a ration balancer intended for broodmares, youngstock, and horses requiring an elevated nutrient intake. This ration balancer is meant to support hoof health, coat condition, and immune function.
Gut Powder (Uckele)
DigestionDigestion
Gut HealthGut Health
HerbHerb
NutrientsNutrients
Uckele Gut Powder is designed as a digestion and gastrointestinal tract supplement containing marshmallow root, slippery elm bark, and aloe vera gel. It also contains yeast and probiotic cultures.
H-150 Competition (Royal Horse)
Competition HorsesCompetition Horses
DigestionDigestion
HealthHealth
NutritionNutrition
H-150 Competition from Royal Horse is intended for horses and ponies in moderate to heavy work. H-150 Competition is intended to support horses who are prone to gastrointestinal-related problems.
H-200 Competition (Royal Horse)
Competition HorsesCompetition Horses
EnergyEnergy
Gut HealthGut Health
HealthHealth
H-200 Competition from Royal Horse is a pelleted feed is intended for horses and ponies in moderate to heavy work. H-200 Competition contains additional mannan-oligosaccharides which are intended to bio-regulate gut flora in horses.
H-250 Competition (Royal Horse)
Competition HorsesCompetition Horses
EnergyEnergy
HealthHealth
NutritionNutrition
H-250 Competition from Royal Horse is an extruded feed intended for performance horses. This feed is formulated with additional Vitamin C, Vitamin E and organic selenium.
H-350 Competition (Royal Horse)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
EnergyEnergy
NutritionNutrition
H-350 Competition from Royal Horse is a textured feed intended for performance horses. H-350 Competition is formulated with additional mannan-oligosaccharides and contains 13.5% protein and 9% fat.
Health Mash (Dodson & Horrell)
FiberFiber
Gut HealthGut Health
HerbHerb
NutritionNutrition
Health Mash by Dodson & Horrell is a supplementary feed meant to support immune and digestive function, with added antioxidants and yeast. The ingredients list includes wheatbran, vegetable oil, and herbs. Health Mash is a molasses-free option.
Hedgerow Pronto Paste (BioStar)
Gut HealthGut Health
HealthHealth
HindgutHindgut
ImmunityImmunity
Hedgerow Pronto Paste from BioStar is a paste intended to provide gut support to horses. Hedgerow Pronto Paste contains reed sedge peat, fennel and peppermint intended to provide digestive support.
Herbal Quiet Mix (Allen & Page)
ExerciseExercise
HerbHerb
NutrientsNutrients
Weight IssuesWeight Issues
Herbal Quiet Mix from Allen & Page is intended for horses and ponies at rest or in light to medium work. This feed contains nettle, rosemary, cloves, and garlic.

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