Home Feeds Ingredients Microbial-based Additives

Microbial-based Additives - Feed Ingredient

Microbial-based additives include live microorganisms such as yeasts (Saccharomyces cerevisiae) and bacteria (Lactobacillus, Bifidobacterium, Enterococcus), as well as their derivatives like bacterial or yeast extracts and fermentation products. These additives are used in equine feeds to support gut microbial balance, improve fiber digestion, and enhance nutrient utilization.
Extracts and postbiotics may include cell wall components (e.g., beta-glucans, mannan-oligosaccharides) or fermentation metabolites that influence gut function and immunity. Enzymes produced through microbial fermentation, such as cellulase or xylanase, may also be included to assist in the breakdown of fibrous feed components.

The following equine feeds, supplements and products contain Microbial-based Additives as an ingredient.

Feeds, Supplements & Products

AminoTrace+ Vitamin and Mineral Supplement (Mad Barn)

Hoof Health

Metabolic Syndrome

Organic Trace Minerals

Vitamins

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.

Natural E/Organic Se (Mad Barn)

Antioxidant

Organic Trace Minerals

Recovery

Vitamins

Natural E/Organic Se is a pelleted supplement providing organic Selenium yeast and natural Vitamin E. These two nutrients are important antioxidants that support muscle function and anti-inflammatory pathways.

Reproductive Supplement Muscle Supplement Immune Supplement Mineral Supplements Supplement Vitamin Supplements Organic Minerals

Omneity P – Pellets – Vitamin & Mineral Supplement (Mad Barn)

Gut Health

Hoof Health

Mineral Balance

Organic Trace Minerals

Ration Balancer

Omneity Pellets is a balanced mineral and vitamin supplement for horses in a palatable pellet form. It provides 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast and digestive enzymes.

Commercial Feeds & Supplements Supplement Amino Acid Supplements Bone Supplement Mineral Supplements Reproductive Supplement Vitamin Supplements Minerals Vitamins Organic Minerals

Omneity Premix – Vitamin & Mineral Supplement (Mad Barn)

Hoof Health

Mineral Balance

Organic Trace Minerals

Vitamins

Omneity Premix is a balanced mineral and vitamin supplement for horses providing 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast, and digestive enzymes.

Commercial Feeds & Supplements Amino Acid Supplements Bone Supplement Mineral Supplements Reproductive Supplement Vitamin Supplements Minerals Organic Minerals Supplement

Optimum Digestive Health Pellets (Mad Barn)

Digestion

Feed Efficiency

Gut Health

Probiotic

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.

Supplement Gut Supplement Probiotics

Optimum Probiotic (Mad Barn)

Digestion

Gut Health

Immunity

Probiotic

Mad Barn's Optimum Probiotic is a pure 5-strain probiotic supplement in a powdered format. It provides 20 billion CFU per serving of L. acidophilus, L. fermentum, L. casei, L. plantarum, and L. farciminis.

Gut Supplement Probiotics

Trace Mineral Pak (Mad Barn)

Coat Quality

Exercise

Hoof Health

Organic Trace Minerals

Trace Mineral Pak from Mad Barn is a balanced equine supplement providing 100% organic (chelated) trace minerals. Ingredients include selenium, zinc, copper, and manganese.

Hoof Supplement Immune Supplement Joint Supplement Skin & Coat Supplement Mineral Supplements Supplement Minerals Organic Minerals

Visceral+ (Mad Barn)

Digestion

Gut Health

Immunity

Probiotic

Ulcers

Yeast

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.

Supplement Gut Supplement Probiotics

Stable Mix (Elk Grove Milling)

Caloric Energy

Complete Feed

Fiber

Gut Health

Stable Mix by Elk Grove Milling is a complete pelleted formula intended for all horses. This feed is high in fiber (30%) and can be used to replace forage in a horse's diet.

Commercial Feeds & Supplements Legume Hay Complete Forages Fiber Minerals Vitamins Oats

Stable Mix Futurity (Elk Grove Milling)

Growth

Performance

Prebiotic

Probiotic

Stable Mix Futurity by Elk Grove Milling is a pelleted feed intended for young horses in training.

Complete Feeds

Stable Mix GC (Elk Grove Milling)

Complete Feed

Health

Joints

Nutrients

Stable Mix GC by Elk Grove Milling is a complete pelleted feed containing glucosamine and chondroitin. It is intended for horses that show signs of arthritis.

Complete Feeds

Stable Mix Lite (Elk Grove Milling)

Complete Feed

Health

Low NSC Feeds

Nutrients

Stable Mix Lite by Elk Grove Milling is a high fiber feed containing less than 12% NSC. It is intended for easy keepers, or horses needing low sugar and starch diets.

Commercial Feeds & Supplements Complete Feeds Feeds Minerals Vitamins

Stablemate (Barastoc)

Amino Acid

Energy

Performance

Ulcers

Stablemate from Barastoc is a grain mix that is made for high performance horses. It contains amino acids and is meant to help with ulcers, gut health, and provide energy.

Energy Sources Amino Acid Supplements

Stabul 1 (Anderson Feed Co)

Easy Keeper

Low NSC Feeds

Metabolic Syndrome

Weight Issues

Stabul™ 1 is a low-starch (5%) and low-sugar (5%) feed intended for easy keepers and horses, ponies and mules with metabolic concerns. It is corn, oats and molasses-free.

Commercial Feeds & Supplements Feeds Fiber

Stabul 1 Plus (Anderson Feed Co)

Exercise

Metabolic Syndrome

Nutrition

Weight Issues

Stabul™ 1 Plus is a low-starch (5%) and low-sugar (5%) feed intended for horses that are in work or hard keepers. It is designed for horses with metabolic concerns to provide higher energy density.

Commercial Feeds & Supplements Feeds Fiber

Staggers Mix (Dunstan)

Caloric Energy

Digestion

Grains

Nutrients

Staggers Mix by Dunstan is a textured mix of extruded cereals, barley, peas, soybean meal, vegetable oil, vitamins and minerals. It also includes Mannan Oligosaccharide and Aluminosilicate Clay intended to improve digestive comfort.

Feeds

Stake Horse (Woody’s Horse Nutrition)

Competition Horses

Digestion

Fiber

Performance

Stake Horse by Woody’s Horse Nutrition is a beet-based 9% fat and 13% protein feed intended for racehorses. It is made with molasses, oats, barley, and beet pulp. This horse is intended for racehorses or performance horses.

Commercial Feeds & Supplements Feeds

Stallion Max (Hallway)

Caloric Energy

Nutrition

Omega 3-6-9

Stallion

Stallion Max from Hallway is a fortified high-fat, high-fibre feed formulated for stallions. This feed has added omega-3 fatty acids. Stallion Max contains 14% protein, 6% fat, and 12% fibre. It is recommended to start feeding 'Stallion Diets' 60 to 90 days before breeding season begins.

Commercial Feeds & Supplements Feeds

Stallion Mix (Dunstan)

Complete Feed

Energy

Nutrients

Stallion

Stallion Mix by Dunstan is a complete feed formulated to meet the nutrient and energy demands of a stallion during breeding season. It contains extruded cereal grains, vegetable oils, minerals and vitamins.

Energy Sources Complete Feeds

Stallion SPM-21: Fertility Supplement (Blue Chip Feed)

Amino Acid

Gut Health

Immunity

Stallion

Stallion SPM-21: Fertility Supplement from Blue Chip Feed is intended for fertile stallions to support sperm quality, motility, viability, and velocity. This supplement contains melon extract and folic acid.

Reproductive Supplement Feed Additives Commercial Feeds & Supplements

Staminoats (Hallway)

Broodmare

Growth

Lactation

Nutrition

Staminoats from Hallway is a cubed feed fortified with Stamm 30, formulated for broodmares and young growing horses. This feed provides 14% protein, 3% fat, and 11% fibre.

Commercial Feeds & Supplements Feeds Oats

Stamm 30 (Hallway)

Broodmare

Foal

Growth

Stallion

Stamm 30 from Hallway is a vitamin and mineral pellet formulated for growing, reproducing, recreational and performance horses. This can be fed alone to easy keepers, or used to top dress feed for horses not getting the full feeding rate of concentrate feeds. Stamm 30 is used in other Hallway feeds as the source of vitamins and minerals.

Commercial Feeds & Supplements Supplement

Starch Wise (ProElite)

Gut Health

Nutrition

Performance

Senior

ProElite Starch Wise is a pelleted horse feed with a maximum 14.5% NSC. It is formulated with moderate levels of starch and sugar for mature show and performance horses.

Commercial Feeds & Supplements Feeds

Stay Cool (Keyflow Feeds)

Ingredient

Low NSC Feeds

Prebiotic

Probiotic

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.

Commercial Feeds & Supplements Complete Forages

Steady Energy Formula (Bartlett Milling) [Discontinued]

Energy

Fat

Grain Free

Performance

Bartlett Steady Energy Formula is a pelleted feed intended for mature horses that require lower levels of energy in their diet. It provides 12% protein and 6% fat.

Commercial Feeds & Supplements Feeds Protein Fiber

Step (Vita Vet Labs)

Hoof Health

Mineral Balance

Nutrients

Vitamins

Step by Vita Vet Labs is a supplement intended to support healthy hoof growth in horses.

Mineral Supplements Supplement Hoof Supplement Vitamin Supplements

Step 1 Start Right (Trouw Nutrition)

Complete Feed

Foal

Growth

Lactation

Step 1 Start Right is an extruded feed formulated to meet the nutritional demands of lactating broodmares, foals and weanlings. It can be fed to growing horses up to one year of age.

Commercial Feeds & Supplements Feeds

Step 2 Peak Performance – Sport (Trouw Nutrition)

Complete Feed

Fat

Performance

Weight Issues

Step 2 Peak Performance - Sport by Trouw is an extruded, high-fat feed formulated to meet the energy demands of horses in heavy work, stallions, growing horses, and hard keepers. It provides 14% protein and 10% fat from vegetable oils.

Commercial Feeds & Supplements Feeds

Step 2 Peak Sweet (Trouw Nutrition) [DISCONTINUED]

Complete Feed

Exercise

Flavor

Growth

Step 2 Peak Sweet is a textured, high-energy feed for horses in heavy work, stallions, growing horses, and hard keepers. It contains 14% protein and 10% fat.

Commercial Feeds & Supplements Feeds Sweet Feed

Step 3 Classic Sweet (Trouw Nutrition)

Caloric Energy

Complete Feed

Flavor

Weight Issues

Step 3 Classic Sweet is a textured sweet feed for mature horses in light to moderate work. It contains whole oats and added sugars to improve palatability.

Commercial Feeds & Supplements Feeds Sweet Feed

Step 3 GenAPro (Trouw)

Complete Feed

Fiber

Hay Stretcher

Low NSC Feeds

Trouw GenAPro (GAP) is an alfalfa-based, high fibre and low NSC feed with less than 10% sugar and starch content. GenAPro is designed as a partial or total hay replacer when quality forage is limited.

Commercial Feeds & Supplements Feeds

Step 4 Complete – Rocky Mountain Crunch (Trouw Nutrition) [DISCONTINUED]

Digestion

Fiber

Hay Stretcher

Ration Balancer

Step 4 Complete Rocky Mountain Crunch is an extruded, high-fibre feed used to partially replace forage. The kibbles contain 14% protein as well as essential vitamins and minerals.

Commercial Feeds & Supplements Complete Feeds

Step 4 Low Sugar Lite (Trouw Nutrition)

Complete Feed

Digestion

Fiber

Low NSC Feeds

Step 4 Low Sugar Lite by Trouw Nutrition is a high-fibre pelleted feed intended for horses who are prone to founder, sugar sensitivities, insulin resistance and metabolic disorders.

Commercial Feeds & Supplements Complete Feeds

Step 5 Top Up Mineral (Trouw Nutrition)

Health

Mineral Balance

Ration Balancer

Vitamins

Step 5 Top Up Mineral by Trouw Nutrition is a loose mineral supplement intended for horses who need additional vitamins and minerals in their diet.

Mineral Supplements Commercial Feeds & Supplements Minerals Vitamins Supplement

Step 6 Senior (Trouw Nutrition)

Complete Feed

Dental

Senior

Weight Issues

Step 6 Senior is a pelleted and extruded feed intended for senior horses and hard keepers. It contains 5% fat, 16% protein and can be given to senior horses with dental issues.

Commercial Feeds & Supplements Complete Feeds

Step 7 Top Up Supplement (Trouw Nutrition)

Easy Keeper

Gut Health

Ration Balancer

Vitamins

Step 7 Top Up Supplement by Trouw Nutrition is a ration balancer intended to be used when horses are not consuming a complete feed, such as corn, oats or barley. It can be used for over-conditioned horses, horses on pasture and horses with low energy requirements.

Commercial Feeds & Supplements Mineral Supplements Supplement Vitamin Supplements

Step 8 High Fat (Trouw Nutrition)

Complete Feed

Fat

Performance

Weight Issues

Step 8 High Fat - Cool Energy by Trouw Nutrition is a pelleted feed intended for performance horses or horses that required fat-sourced energy.

Commercial Feeds & Supplements Feeds Fat

Step Right Horse Mineral (Trouw Nutrition) [DISCONTINUED]

Gut Health

Health

Ration Balancer

Vitamins

Step Right Horse Mineral (formerly Step 7b Pro Equine Supplement) is a concentrated mineral and vitamin supplement for horses in a loose powdered format. It is intended for horses that are not consuming complete feed, horses on pasture, or easy keepers.

Commercial Feeds & Supplements Mineral Supplements Vitamin Supplements

Stock Builder (Star Milling Co)

Exercise

Growth

Muscle

Protein

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.

Commercial Feeds & Supplements Feeds Protein

Stocked Up (Outlaw Feed)

Mineral Balance

Nutrition

Vitamins

Yeast

Stocked Up by Outlaw Feed is a textured supplement for horses that are intended to be fed to all ruminants. It contains a source of omega-3 fatty acids. It is meant to help reduce antibiotic use and support healthy skin.

Feed Additives Commercial Feeds & Supplements Supplement Fat

Stress Free Forage (Triple Crown)

Digestion

Fiber

Forage

Nutrition

Stress Free Forage by Triple Crown is intended for performance and underweight horses. It is ideal for horses that have ulcers, leaky gut syndrome, and horses stressed by trailering.

Commercial Feeds & Supplements Feeds Legume Hay Fiber Gut Supplement

Stress Relief (Krafft)

Calming

Mineral Balance

Stress

Vitamins

Stress Relief by Krafft is a supplement intended to help calm horses in stressful situations. It contains tryptophan, magnesium, and B vitamins.

Feed Additives Commercial Feeds & Supplements Supplement Amino Acid Supplements Vitamins

Strucomix Original (Cavalor)

Complete Feed

Fiber

Herb

Organic Trace Minerals

Strucomix Original by Cavalor is an oat-free, corn-free and molasses-free feed for horses in maintenance to moderate work. A textured and balanced feed for horses rich in fiber and herbs.

Commercial Feeds & Supplements Feeds Fiber

Strucomix Senior (Cavalor)

Complete Feed

Digestion

Fiber

Senior

Strucomix Senior by Cavalor is a high-fibre feed formulated with puffed and extruded grains to improve digestibility. It contains 14% protein that help support weight and muscle maintenance.

Commercial Feeds & Supplements Feeds Protein

Structure E Grain-Free (St.Hippolyt)

Energy

Grain Free

Low NSC Feeds

Nutrition

Structure E by St.Hippolyt is a grain-free feed low in starch and sugar, and is intended for all types of horses and ponies.

Feeds Complete Feeds

Stud & Youngstock Mix (Allen & Page)

Broodmare

Foal

Growth

Stallion

Stud & Youngstock Mix from Allen & Page is intended for stallions, lactating and pregnant broodmares, growing foals, and young stock. This feed contains yeast, garlic, and mint.

Commercial Feeds & Supplements Complete Forages

Stud and Youngstock Mix (Spillers Feeds)

Bone Health

Broodmare

Coat Quality

Growth

Stud and Youngstock Mix from Spillers Feed are intended for young horses under 2 years old, broodmares, and stallions. This feed mix contains calcium, magnesium, and phosphorous, supporting skeletal development and bone health.

Commercial Feeds & Supplements Complete Forages

Stud Feed Balancer (TopSpec)

Amino Acid

Ration Balancer

Stallion

Yeast

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.

Commercial Feeds & Supplements Complete Forages Gut Supplement

Stud Lite Feed Balancer (TopSpec)

Broodmare

Growth

Ration Balancer

Stallion

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.

Commercial Feeds & Supplements Ration Balancer Complete Forages

Stud Mix (Bluegrass Horse Feed)

Broodmare

Digestion

Growth

Stallion

Stud Mix is formulated to help with digestion and nutrient uptake in breeding stock, including broodmares, stallions, and growing horses. It contains 14% protein, 6.2% fat, and 10.4% fibre.

Commercial Feeds & Supplements Feeds Complete Forages Corn Oats Gut Supplement Starch

Stud Time (Capstone Horse Feed)

Broodmare

Growth

Protein

Stallion

Stud Time by Capston Horse Feed is a muesli style feed intended for broodmares, stallions and growing horses.

Complete Feeds

Studmaster (Pegasus)

Broodmare

Complete Feed

Growth

Stallion

Studmaster from Pegasus is intended for stallions, broodmares, and growing horses. This feed contains amino acids to support growth, buffered mineral complex to support bone development and vitamins.

Commercial Feeds & Supplements Complete Forages

SU-PER Farrier’s Supplement Pellets (Gateway Products)

Amino Acid

Hoof Health

Probiotic

Vitamins

SU-PER Farrier's Supplement Pellets by Gateway Products is a hoof supplement with 25mg of Biotin per serving. This supplement supports healthy hoof growth and structure.

Commercial Feeds & Supplements Supplement Hoof Supplement

SU-PER First Response Paste (Gateway Products)

Digestion

Gut Health

Prebiotic

Yeast

SU-PER First Response Paste by Gateway Products is a fast-acting gut supplement designed for immediate digestive support. This supplement contains concentrated prebiotics, yeast extract, and B-vitamins.

Feed Additives Commercial Feeds & Supplements Supplement

SU-PER Form Pellets (Gateway Products)

Health

Mineral Balance

Probiotic

Vitamins

SU-PER Form Pellets by Gateway Products is a vitamin and mineral supplement that provides all the necessary nutrients. This supplement also includes additional amino acids and electrolytes and is meant for horses of all life stages.

Feed Additives Commercial Feeds & Supplements Mineral Supplements Supplement Vitamin Supplements

SU-PER Gain Weight (Gateway Products)

Amino Acid

Feed Efficiency

Muscle

Weight Issues

SU-PER Gain Weight by Gateway Products is a weight-gaining product designed for hard keepers. It contains coconut oil as its fat source, the essential amino acids for muscle retention, and probiotics to aid in nutrient absorption.

Feed Additives Commercial Feeds & Supplements Supplement Weight Gain Supplement Fat

SU-PER GastroShield Powder (Gateway Products)

Gut Health

Nutrients

Probiotic

Ulcers

SU-PER GastroShield Powder by Gateway Products is a gut supplement meant to soothe the stomach from gastric acid upset. This supplement is for horses with a history of gastric ulcers or those at risk of developing gastric issues.

Commercial Feeds & Supplements Gut Supplement

SU-PER Hoof Powder (Gateway Products)

Amino Acid

Hoof Health

Nutrients

Vitamins

SU-PER Hoof Powder is a hoof supplement that contains 30 mg of biotin per serving to support optimal hoof growth and structure. This supplement is for maintenance use in the winter and when a hoof suffers damage.

Commercial Feeds & Supplements Hoof Supplement