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Selenium - Feed Ingredient

Selenium is an essential trace mineral required in equine nutrition for its role in antioxidant defense, immune function, and thyroid hormone metabolism. It is a key component of glutathione peroxidase, an enzyme that helps protect cells from oxidative damage by neutralizing free radicals. Selenium also plays a role in muscle function and overall metabolic health.

Horses can obtain selenium from forages, but its content varies depending on soil selenium levels in different regions. In areas with selenium-deficient soils, supplementation is necessary to prevent deficiencies, which can lead to conditions such as white muscle disease, impaired immune function, and poor reproductive health. Selenium is commonly supplemented in the form of sodium selenite, sodium selenate, or organic selenium sources such as selenium yeast, which is considered more bioavailable.

Because selenium has a narrow margin of safety, excessive intake can lead to toxicity, characterized by symptoms such as hair loss, hoof abnormalities, and neurological issues. Proper formulation and monitoring of selenium intake are essential to ensure optimal health in horses.

The following equine feeds, supplements and products contain Selenium 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.
Natural E/Organic Se (Mad Barn)
AntioxidantAntioxidant
Organic Trace MineralsOrganic Trace Minerals
RecoveryRecovery
VitaminsVitamins
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.
Omneity P – Pellets – Vitamin & Mineral Supplement (Mad Barn)
Gut HealthGut Health
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation 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.
Omneity Premix – Vitamin & Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
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.
Trace Mineral Pak (Mad Barn)
Coat QualityCoat Quality
ExerciseExercise
Hoof HealthHoof Health
Organic Trace MineralsOrganic 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.
Performance XL (Manna Pro)
Competition HorsesCompetition Horses
NutritionNutrition
PerformancePerformance
ProteinProtein
Performance XL from Manna Pro is a complete feed designed for equine athletes with higher energy demands. It contains Calf-Manna® as a source of protein and Max-E Glo® Stabilized Rice Bran as a source of energy from fat. Performance XL is 12% crude protein, 8% crude fat, and 8% crude fibre.
Phase I – Pelleted (Brooks)
EnergyEnergy
FoalFoal
GrowthGrowth
NutritionNutrition
Phase I - Pelleted is intended for growing horses. Phase I is intended to promote and support growth. This feed contains barley and corn.
Phase I – Textured (Brooks)
FoalFoal
GrowthGrowth
HealthHealth
NutritionNutrition
Phase I is a textured feed intended for growing horses. This feed is intended to support growth and contains oats and soybean meal.
Phase II (Brooks Feeds)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Brooks Feeds Phase II is a horse feed intended for broodmares and yearlings. It is formulated with higher protein content to support growth and development.
Phase III Elite – Textured (Brooks Feeds)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Brooks Phase III Elite - Textured is formulated for performance horses with higher energy needs. It provides a higher fat content from stabilized flax, rice bran, and soy oil. It is also available in a pelleted form.
Phase IV (Brooks)
Complete FeedComplete Feed
EnergyEnergy
FiberFiber
NutritionNutrition
Brooks Phase IV is a pelleted or textured horse feed that provides moderate energy with added fibre. It is targeted to horses at maintenance, in light exercise, early gestation broodmares and young horses in training.
Phase V (Brooks Feeds)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Competition HorsesCompetition Horses
PerformancePerformance
Brooks Phase V is a pelleted or textured feed intended for performance equine athletes. It provides 8% fat and 15% fibre with energy sources including oats, wheat shorts, soybeans, barley, alfalfa meal, and molasses.
Photo Finish (Brooks Feeds)
EnergyEnergy
PrebioticPrebiotic
ProbioticProbiotic
StaminaStamina
Photo Finish from Brooks Feeds is a textured feed that contains fibre and fat. It is a source of energy and supports stamina for speed and power. This feed also includes pre and probiotics.
Physique (Equi-lete)
Bone HealthBone Health
EnergyEnergy
HealthHealth
Mineral BalanceMineral Balance
UlcersUlcers
Physique by Equi-lete is a pelleted supplement intended to support bone and tissue health in all horse types.
Pianissimo (Cavalor)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
Metabolic SyndromeMetabolic Syndrome
Ration BalancerRation Balancer
Pianissimo by Cavalor is formulated to be a lower energy feed with lower protein levels and no added oats. This feed is targeted to hot horses to reduce stress.
Plain 12% Pellet (Sweet Country Feeds)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
Plain 12% Pellet by Sweet Country Feeds is a molasses-free formulation that provides 12% protein and 4% fat. It is intended for mature horses at maintenance or in light exercise.
Plantation 10 All-Grain (Seminole) – [Discontinued]
Complete FeedComplete Feed
GrainsGrains
NutrientsNutrients
SeniorSenior
Seminole Plantation 10 All Grain is a now-discontinued textured horse feed based on oats. It was targeted to mature horses and provided 10% protein and 4% fat.
Platinum Performance® Equine Wellness and Performance Formula
EnergyEnergy
FatFat
JointsJoints
Omega 3-6-9Omega 3-6-9
Platinum Performance® Equine Wellness and Performance Formula is a nutritional supplement containing ground flaxseed, stabilized rice bran, montmorillonite (bentonite) clay and a range of vitamins and minerals.
Pleasure 12% (Manna Pro) [Discontinued]
Complete FeedComplete Feed
FiberFiber
HealthHealth
NutritionNutrition
Manna Pro Pleasure 12% is a pelleted feed formulated for pleasure horses. It contains 12% crude protein, 4% crude fat, 22% crude fibre, and uses a mix of organic and inorganic trace minerals.
Pleasure Pellet (Buckeye)
Complete FeedComplete Feed
EnergyEnergy
Mineral BalanceMineral Balance
ProteinProtein
Buckeye Pleasure Pelleted Horse Feed is formulated for mature horses at maintenance or in light work. Energy sources include wheat middlings, ground corn, soybean oil, and dried molasses.
Pleasure Sweet (Buckeye)
Complete FeedComplete Feed
DigestionDigestion
NutritionNutrition
SeniorSenior
Pleasure Sweet is a multi-particle sweet feed with added molasses to improve palatability. This feed supports digestibility and is intended for mature maintenance or lightly worked horses.
Podium Cool Energy – Pellet (Masterfeeds)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
PerformancePerformance
UlcersUlcers
Podium Cool Energy is a controlled NSC performance feed that utilizes energy from carbohydrates and moderate levels of fat and protein. It is targeted at standardbred racehorses, eventers, and other equine athletes.
Post Time (McCauley’s Equine Formulas)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Post Time® is a highly palatable textured horse feed providing high digestible energy levels for performance horses. It provides 8% crude fat from vegetable oil, 12% protein, and 11% crude fiber.
Power Finish (Tribute)
Complete FeedComplete Feed
EnergyEnergy
ExerciseExercise
PerformancePerformance
Tribute Power Finish is a high-fat textured feed intended for adult horses in heavy training. It provides highly digestible energy sources to support the calorie requirements of racehorses. Power Finish contains high levels of protein (13% crude protein), fat (10% crude fat), and NSC (32%).
Power Play (Brooks Feeds)
EnergyEnergy
FiberFiber
PerformancePerformance
StaminaStamina
Power Play from Brooks Feeds is an energy-dense textured feed. It is intended to support horses in high intensity exercise or performance horses.
Power-Plus Mix (Havens Horsefeed)
ElectrolyteElectrolyte
ExerciseExercise
GrainsGrains
PerformancePerformance
Power-Plus Mix by Havens Horsefeed is a high-energy feed for performance horses. It contains barley flakes, corn flakes, and oats as energy sources. The additional electrolytes support horses in hot climates.
PowerGLO (ADM Animal Nutrition)
Caloric EnergyCaloric Energy
ExerciseExercise
PerformancePerformance
Weight IssuesWeight Issues
PowerGLO is a concentrated feed formulated for elite performance horses. It is high in fat and carbohydrates to support the caloric needs of equine athletes.
Precision (Ark Nutrition)
Amino AcidAmino Acid
FatFat
GrowthGrowth
ToplineTopline
Precision by Ark Nutrition is a pelleted feed that is low in sugar with a moderate starch level meant to ease digestion and is higher in soluble fiber levels to support hindgut function.
Premium Blend Wheat Germ Oil (AniMed)
AntioxidantAntioxidant
Coat QualityCoat Quality
EnergyEnergy
VitaminsVitamins
Premium Blend Wheat Germ Oil from AniMed is a source of vitamin E, antioxidants, and can help with body conditioning and coat quality. It also contains energy and fat.
Premium Horse Pellet AL (Cargill)
DigestionDigestion
ExerciseExercise
NutrientsNutrients
NutritionNutrition
Premium Horse Pellets (AL) by Cargill are intended as a ration balancer for adult horses.
PreOx (HorseTech)
AntioxidantAntioxidant
HealthHealth
ImmunityImmunity
VitaminsVitamins
PreOx from HorseTech is a powdered antioxidant supplement. PreOx contains added vitamins, minerals and added flaxseed. This supplement is intended for horses who require additional antioxidants in their diet.
Prep 14 (Hallway)
Caloric EnergyCaloric Energy
Gut HealthGut Health
RecoveryRecovery
Weight IssuesWeight Issues
Prep 14 from Hallway is a fortified high-energy, fat, and fibre feed for horses with greater energy demands. Prep 14 contains 14% protein, 12.5% fibre, and 10% fat.
Prime (Running Horse)
Competition HorsesCompetition Horses
ExerciseExercise
FatFat
PerformancePerformance
Running Horse Prime is a high-energy extruded feed targeted to performance equine athletes. Calorie sources include wheat middlings, pearled barley, soybean hulls, corn DDGS, stabilized rice bran, vegetable oil, flaxseed, and beet pulp.
PrimeGLO (ADM Animal Nutrition)
FatFat
Omega 3-6-9Omega 3-6-9
PerformancePerformance
Weight IssuesWeight Issues
PrimeGLO is a concentrated horse feed designed for mature horses. It is a soft, easy-to-chew formulation that contains ingredients to support gut health. The total NSC is 14.5%.
Pro Balance (Bluebonnet Feeds)
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
YeastYeast
Pro Balance by Bluebonnet is a comprehensive diet balancer formulated to correct vitamin and mineral deficiencies commonly found in forage-only diets for horses. It also includes yeast, probiotics, and digestive enzymes to support optimal gut health and nutrient absorption.
Pro Horse 12 (MAC)
EnergyEnergy
FatFat
NutrientsNutrients
SeniorSenior
Pro Horse 12 by MAC is a high energy feed with vitamins and minerals, it is intended for mature horses.
Pro Mare (MAC)
BroodmareBroodmare
LactationLactation
Mineral BalanceMineral Balance
NutrientsNutrients
Pro Mare by MAC is a salt-limited supplement intended for lactating or dry mares on hay or pasture.
Pro Mare With Clarifly (MAC)
BroodmareBroodmare
HealthHealth
LactationLactation
NutrientsNutrients
Pro Mare with Clarifly by MAC is a protein, vitamin and mineral supplement. It is intended to control the development of flies in the manure of dry and lactating mares.
Pro Star 10% Pellets (West Feeds)
Caloric EnergyCaloric Energy
FatFat
FiberFiber
GrainsGrains
Pro Star 10% Pellets by West Feeds is a feed formulated with ingredients like grain products, plant protein, and roughage products. It contains 10% protein and 6% fat content provided by some added vegetable oil.
Pro Star 12% Pellets (West Feeds)
Easy KeeperEasy Keeper
FiberFiber
GrainsGrains
NutritionNutrition
Pro Star 12% Pellets by West Feeds is for lower energy requirements with 12% protein content and 3.5% fat content. It contains inorganic vitamins and minerals and a moderate level of fibre.
Pro Star 14% Pellets (West Feeds)
ExerciseExercise
GrainsGrains
GrowthGrowth
ProteinProtein
Pro Star 14% Pellets by West Feeds is a feed meant to support young horses, containing 14% protein content and 3.5% fat content. Soybean oil and inorganic vitamins and minerals are added to help support support growth.
Pro Star Complete 3/8 (West Feeds)
Caloric EnergyCaloric Energy
FiberFiber
Gut HealthGut Health
NutritionNutrition
Pro Star Complete 3/8 by West Feeds is a high fibre feed with ingredients such as plant protein and processed grains. It contains a minimum of 12% protein and a maximum of 25% fibre.
Pro V.M. (Peak Performance Nutrients)
JointsJoints
MuscleMuscle
PerformancePerformance
StaminaStamina
Pro V.M. by Peak Performance Nutrients is a multi-use vitamin, mineral and amino acid supplement designed with race horses in mind. It intends to support the extreme demands on the horse’s joints, immune system and muscular system.
Pro V.M. with EFAs (Peak Performance Nutrients)
AntioxidantAntioxidant
ElectrolyteElectrolyte
JointsJoints
MuscleMuscle
Pro V.M. with EFAs by Peak Performance Nutrients is a vitamin, mineral, amino acid & probiotic supplement designed with race horses in mind. It intends to support the extreme demands on the horse’s joints, immune system and digestive system.
Pro-Care Senior Select (West Feeds)
Caloric EnergyCaloric Energy
DigestionDigestion
FlavorFlavor
SeniorSenior
Pro-Care Senior Select by West Feeds is made for senior horses, containing elevated protein levels. This feed also includes molasses and soybean oil to soften the pellets and make them more palatable.
Pro-Formance 14% (West Feeds)
Complete FeedComplete Feed
ExerciseExercise
FatFat
ProteinProtein
Pro-Formance 14% by West Feeds is a feed for performance horses, with an elevated protein level of 14% and a good level of fat of 6%. This feed is meant for high energy performance and includes ingredients such as inorganic vitamins and minerals and soybean oil to support the activity level.
Pro-Plus (West Feeds)
Caloric EnergyCaloric Energy
ExerciseExercise
GrainsGrains
ProteinProtein
Pro-Plus by West Feeds is a feed meant for active horses, high in energy, with a protein level of 12% and a fat content of 6%. The ingredients in this feed include added soybean oil, inorganic vitamins and minerals, and yeast products to maintain a healthy and active lifestyle.
Pro-Plus 12 Sweet (Seminole) – [Discontinued]
Amino AcidAmino Acid
Complete FeedComplete Feed
ExerciseExercise
GrowthGrowth
Seminole Pro-Plus 12 Sweet is a now-discontinued oat-based textured feed for growing, breeding, pleasure and performance horses.
PRO-TECT LS (Dove Performance Nutrition)
HealthHealth
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
NutritionNutrition
PRO-TECT LS by Dove Performance Nutrition is a pelleted feed intended for all horse types.
Pro-Vide 10% (West Feeds)
FatFat
FiberFiber
GrainsGrains
NutritionNutrition
Pro-Vide 10% by West Feeds is a feed designed to support the active horse in conjunction with an additional protein source. This feed provides 10% of protein, 5% fat content, and 12% fibre content with added soybean oil and inorganic vitamins and minerals.
Pro24 Supplement (Hoffman’s Horse Products)
Easy KeeperEasy Keeper
Feed EfficiencyFeed Efficiency
HealthHealth
NutritionNutrition
Pro24 Supplement from Hoffman's is a concentrated protein, vitamin, and mineral supplement to support horses over 1 year of age. Pro24 Supplement is intended to be fed with good quality forages and contains no added sugars or starches.
ProAdvantage – Alfalfa Formula (Progressive Nutrition)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
ProAdvantage® – Alfalfa Formula is a ration balancer concentrate intended for horses consuming alfalfa hay. This feed contains amino acids, vitamins, and minerals in a lower-starch format.
ProAdvantage – Grass Formula (Progressive Nutrition)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
ProAdvantage® – Grass Formula is a concentrated ration balancer intended for horses consuming grass or mixed hay. This feed contains amino acids, vitamins, and minerals in a lower-starch format.
ProBreed (Cavalor)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Cavalor ProBreed is a textured feed for pregnant and gestating mares, as well as foals under 1 year of age. It contains 16% protein from sources such as alfalfa, wheat middlings and soybeans.
Profecta 10 (Seminole)
Caloric EnergyCaloric Energy
Feed EfficiencyFeed Efficiency
GrainsGrains
YeastYeast
Seminole Profecta 10™ is a pelleted feed providing grains, digestible fibers, yeast and molasses with 21% NSC. It is targeted at active mature horses and ponies.

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