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L-Threonine - Feed Ingredient

L-Threonine is an essential amino acid necessary for protein synthesis, muscle maintenance, and immune function in horses. Since it cannot be produced by the horse’s body, it must be obtained through the diet.

In equine nutrition, L-Threonine is one of the first limiting amino acids, meaning its availability directly affects protein utilization and muscle development. It plays a vital role in gut health, supporting mucus production in the digestive tract, which aids nutrient absorption and protects intestinal integrity. L-Threonine supplementation is often used in diets for growing, performance, or recovering horses to optimize protein efficiency and support overall metabolic function.

The following equine feeds, supplements and products contain L-Threonine 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.
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.
Three Amigos (Mad Barn)
Amino AcidAmino Acid
MuscleMuscle
ProteinProtein
RecoveryRecovery
Three Amigos is an equine essential amino acid supplement containing lysine, methionine, and threonine in a 5:3:2 ratio. These are the three most common limiting amino acids in the horse's diet.
Threonine (Mad Barn)
Amino AcidAmino Acid
Gut HealthGut Health
MuscleMuscle
ToplineTopline
Threonine is an essential amino acid that is required to be supplied in equine diets as it cannot be synthesized endogenously. Threonine supplementation may improve nutrient absorption.
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.
Regen-X (100 X Equine)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
PerformancePerformance
RecoveryRecovery
Regen-X from 100 X Equine is an amino acid supplement intended for performance horses. Regen-X is intended to build muscle tone and support recovery after exercise.
Repair Daily Formula (Red Hot Equine Aminos)
Amino AcidAmino Acid
MuscleMuscle
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Repair Daily Formula by Red Hot Equine Aminos is a powdered supplement formulated with amino acids, trace minerals, and electrolytes. It is specifically designed to support muscle recovery in horses.
Resolve (Tribute)
EnergyEnergy
ImmunityImmunity
MuscleMuscle
PerformancePerformance
Resolve is a pelleted complete feed from Tribute that is formulated to provide high-fat and high-fibre content with an NSC of 17.5%. It provides added Vitamin E which can support antioxidant status.
Rice Bran (Triple Crown)
EnergyEnergy
ExerciseExercise
FatFat
Weight IssuesWeight Issues
Triple Crown Rice Bran Natural is a high-fat horse supplement intended for underweight and hard-working performance horses. It contains added amino acids and calcium.
SafeChoice All Life Stages (Nutrena)
Gut HealthGut Health
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
ToplineTopline
SafeChoice All Life Stages is a pelleted feed that is meant to support skin and coat health, hoof health, and topline support. It is also supposed to assist with gut health and immunity, and contains organic trace minerals.
SafeChoice Maintenance (Nutrena)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
NutritionNutrition
Nutrena SafeChoice Maintenance is a pelleted horse feed that provides a maximum of 25% NSC (20% starch and 5% sugar). It is intended as a low-starch feed to maintain body condition.
SafeChoice Mare & Foal Pellet (Nutrena)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
SafeChoice Mare & Foal Pellet is a horse feed intended for pregnant or lactating mares, weanlings, and yearlings. It contains a maximum of 22% NSC with higher protein meant to meet the needs of growing horses.
SafeChoice Mare & Foal Textured (Nutrena)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Nutrena SafeChoice Mare & Foal Textured is a texturized feed intended for pregnant or lactating mares, weanlings, and yearlings. It contains a maximum of 30% NSC and 16% protein meant to meet the needs of growing horses.
SafeChoice Original (Nutrena) – [DISCONTINUED]
Complete FeedComplete Feed
Gut HealthGut Health
HealthHealth
Ration BalancerRation Balancer
Nutrena SafeChoice Original is a pelleted horse feed intended to meet the nutritional needs of a wide range of horses. It provides 22% NSC with 14% protein and 7% fat. SafeChoice Original is now SafeChoice All Stages.
SafeChoice Perform Pellet (Nutrena)
Competition HorsesCompetition Horses
EnergyEnergy
ExerciseExercise
NutritionNutrition
SafeChoice Perform is a pelleted feed intended to meet the needs of hard keepers and performance horses. It contains 14% crude protein, 9% crude fat, and 24% NSC.
SafeChoice Perform Textured (Nutrena)
Competition HorsesCompetition Horses
EnergyEnergy
ExerciseExercise
NutritionNutrition
Nutrena SafeChoice Perform Textured is a high-fat high-calorie feed. It is intended for horses with higher energy requirements, including performance horses and hard keepers.
SafeChoice Senior (Nutrena)
Coat QualityCoat Quality
DentalDental
SeniorSenior
Weight IssuesWeight Issues
SafeChoice Senior is an easy-to-chew, high-fat, controlled starch feed intended for older horses. It is meant to support horses experiencing age-related weight loss, fatigue, or horses with muscle or coat quality issues.
SafeChoice Senior LM (Nutrena)
Coat QualityCoat Quality
DentalDental
SeniorSenior
Weight IssuesWeight Issues
SafeChoice Senior LM is a lower-molasses (LM) high-starch feed intended for senior horses, particularly horses that need to gain weight or have dental issues. It contains 14% crude protein, 8% crude fat, and 18.5% NSC.
SafeChoice Special Care (Nutrena)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
SafeChoice Special Care by Nutrena is a controlled starch formula intended for horses with metabolic concerns and easy keepers. It is a corn-free feed that contains a maximum of 7% dietary starch and 3% sugar.
Senior (Running Horse Elite Equine Nutrition)
DigestionDigestion
Feed EfficiencyFeed Efficiency
SeniorSenior
Weight IssuesWeight Issues
Running Horse Nutrition Senior is a highly digestible feed providing 14% protein, vegetable fat, and micro-nutrients. This feed targets older horses to help them maintain their body condition.
Senior Active + (Triple Crown)
HealthHealth
NutritionNutrition
SeniorSenior
Weight IssuesWeight Issues
Senior Active + from Triple Crown is an extruded pelleted intended for older horses or hard keepers. This feed is intended for horses with metabolic issues.
Senior Gold (Triple Crown)
DentalDental
DigestionDigestion
FatFat
SeniorSenior
Triple Crown Senior Gold is a grain-free, beet pulp-based soft feed intended for older horses. It contains 14.5% protein, 12.5% fat and 9% NSC. Senior Gold can be mixed with water to form a mash for horses with dental issues or prone to choke.
Senior Health & Wellness (Farnam)
Gut HealthGut Health
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Farnam's Senior Health & Wellness supplement is formulated for senior horses in light work or at maintenance. Senior Health and Wellness is an extruded nugget feed containing amino acids, vitamins, and minerals for horses on a forage-only diet.
Senior Pellet (Right Choice)
FatFat
FiberFiber
NutritionNutrition
SeniorSenior
Senior by Right Choice is a pelleted complete feed intended for senior horses with elevated protein. It contains 14% protein, 7% fat, and 19% NSC.
Senior Pellets (Ritchie Smith – Harmony)
HealthHealth
NutritionNutrition
SeniorSenior
Weight IssuesWeight Issues
Senior Pellets from Ritchie Smith's Harmony is a pelleted feed intended for senior horses. This feed is also intended for horses who are hard keepers. Senior Pellets contains 15% crude protein and crude fibre.
Senior Ration (Hoffman’s Horse Products)
Complete FeedComplete Feed
Feed EfficiencyFeed Efficiency
SeniorSenior
Weight IssuesWeight Issues
Hoffman's Senior Horse Ration is a feed designed for senior horses that need extra caloric energy to maintain weight. This feed contains 17.5% NSC with moderate fat content (5%) and high fibre content (24%).
Senior Sport (Tribute)
Complete FeedComplete Feed
ExerciseExercise
FiberFiber
SeniorSenior
Tribute Senior Sport™ is a high calorie feed for mature performance horses. It provides 16.5% NSC with 10% fat and 18% fibre to support performance.
Senior Sport with Glucosamine (Tribute)
ExerciseExercise
FatFat
FiberFiber
SeniorSenior
Senior Sport with Glucosamine by Tribute is a textured feed for seniors with added glucosamine that intends to support joint health. It contains high fat and fibre to support calmer performances.
Senior Textured Feed (ProElite)
DigestionDigestion
Feed EfficiencyFeed Efficiency
PerformancePerformance
SeniorSenior
Pro Elite Senior Textured Feed is a high fat (10%) and protein (14%) senior complete feed. It is appropriate for senior horses that need help maintaining or gaining weight.
Seniority GC Plus (Tribute Equine)
Complete FeedComplete Feed
JointsJoints
RespiratoryRespiratory
SeniorSenior
Tribute Seniority™ GC Plus is a textured, complete feed for mature horses that contains additional ingredients to support joint health. It is formulated with glucosamine, chondroitin sulfate, and MSM.
Seniority Low NSC (Tribute)
Complete FeedComplete Feed
HealthHealth
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Seniority Low NSC from Tribute is a complete feed containing 10% NSC (Starch + Sugar). This feed is intended for horses with sugar and starch sensitivities.
Seniority Pellet (Tribute)
Amino AcidAmino Acid
Complete FeedComplete Feed
PerformancePerformance
SeniorSenior
Seniority Pellet is a pelleted complete feed formulated for adult and senior horses. It is a low-calorie feed with a high feeding rate and can be used to replace forage in the diet.
Seniority™ Pellet (Tribute)
Complete FeedComplete Feed
HealthHealth
NutrientsNutrients
Ration BalancerRation Balancer
Tribute Seniority™ Pellet is an 18% NSC complete feed for mature horses. It provides energy from digestible fiber sources including dehulled soybean and alfalfa meal, wheat middlings, and beet pulp.
Sentinel Active Senior (Blue Seal)
ExerciseExercise
FatFat
FiberFiber
SeniorSenior
Blue Seal Sentinel Active Senior is a pelleted feed formulated for active senior horses or hard-keepers. With energy sources such as wheat middlings, soybean hulls, and soybean oil, Sentinel Active Senior contains 19.7% NSC.
Sentinel Care Carb-Guard (Blue Seal)
FiberFiber
Gut HealthGut Health
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Blue Seal Sentinel Care Carb-Guard is a pelleted feed formulated for adult horses with metabolic or digestive health concerns. It contains 10% NSC and is a high-fiber formula.
Sentinel Care Equine Choice Topline 30 (Blue Seal)
Easy KeeperEasy Keeper
ProteinProtein
Ration BalancerRation Balancer
ToplineTopline
Blue Seal Sentinel Care Equine Choice Topline 30 is a pelleted ration balancer with 14.7% NSC. It is formulated to provide protein, vitamins, and minerals that may be lacking in the equine diet.
Sentinel Care Omegatin (Blue Seal)
FatFat
PerformancePerformance
ProteinProtein
Ration BalancerRation Balancer
Sentinel Care Omegatin from Blue Seal is a high-fat supplement intended for horses requiring additional calories. It is a 15.7% NSC formula containing high fat ingredients such as rice bran and soybean oil.
Sentinel Grow & Excel GX (Blue Seal)
ExerciseExercise
FoalFoal
GrowthGrowth
PerformancePerformance
Sentinel Grow & Excel GX is an extruded feed for hard keepers as well as growing, breeding, and performance horses. It provides 10% crude fat, 15% fiber, and a maximum of 17% NSC.
Sentinel LifeTime (Blue Seal)
FatFat
FiberFiber
JointsJoints
PerformancePerformance
Sentinel LifeTime is an extruded feed intended for junior, adult and senior horses that require a higher caloric density. It provides 10% fat, 20% fibre and a maximum NSC of 14.5%.
Sentinel Performance LS (Blue Seal)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
PerformancePerformance
SeniorSenior
Blue Seal Sentinel® Performance LS is an extruded feed providing a maximum of 14% NSC. It is intended for horses requiring a higher calorie diet, such as equine athletes and hard keepers.
Sentinel Safe Start SS (Blue Seal)
Complete FeedComplete Feed
FoalFoal
GrowthGrowth
LactationLactation
Sentinel Safe Start SS is an extruded complete feed formulated for broodmares and growing foals. It provides higher protein content (16%) to meet the increased demands of late gestation, early lactation, and developing foals.
Sentinel Senior SR (Blue Seal)
DentalDental
Feed EfficiencyFeed Efficiency
Ration BalancerRation Balancer
SeniorSenior
Sentinel Senior SR is an extruded feed for older horses and mature easy keepers. It is formulated to provide higher feed efficiency for senior horses with gut issues or poor teeth. The addition of bioavailable marine-sourced calcium supports gastric pH and health.
Sentinel Simply Lite (Blue Seal)
Easy KeeperEasy Keeper
Gut HealthGut Health
Metabolic SyndromeMetabolic Syndrome
ProbioticProbiotic
Sentinel Simply Lite from Blue Seal is a low-calorie pelleted feed intended for adult horses. Formulated for easy keepers, Sentinel Simply Lite provides lower fat and protein content with 16.2% NSC.
Sentinel XT Grow (Blue Seal)
FiberFiber
FoalFoal
GrowthGrowth
LactationLactation
Sentinel® XT™ Grow is a textured horse feed intended for growing foals and lactating mares. It provides 10% fat and 16% protein with primary ingredients including soybean hulls, beet pulp and alfalfa meal.
Sentinel XT Pro (Blue Seal)
GrowthGrowth
NutrientsNutrients
PerformancePerformance
SeniorSenior
Sentinel XT Pro by Blue Seal is a textured feed intended for growing horses, performance horses, gestating mares, breeding horses and senior horses.
Sentinel XT Show (Blue Seal)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
Weight IssuesWeight Issues
Sentinel® XT™ Show is a textured feed intended for active adult horses and competition horses with higher nutrient requirements. It provides a higher fat content (12%) and digestible fibre sources including soybean hulls, beet pulp and alfalfa meal.
Showman (ProElite)
Complete FeedComplete Feed
Low NSC FeedsLow NSC Feeds
MuscleMuscle
PerformancePerformance
ProElite by Showman is a pelleted, extruded feed intended for mature horses in moderate to intense work. It is intended to be a low glycemic feed for supporting muscle strength.
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.
SmartFlex Rehab Pellets (SmartPak)
ExerciseExercise
JointsJoints
ProteinProtein
RecoveryRecovery
SmartFlex Rehab Pellets is a supplement intended for horses rehabilitating from an injury. It contains glucosamine, chondroitin sulfate, and hyaluronic acid for joints and connective tissue.
SmartGain (SmartPak)
DigestionDigestion
IngredientIngredient
NutritionNutrition
YeastYeast
SmartGain from SmartPak is a powdered weight gain equine supplement. SmartGain is formulated with rice bran and coconut meal. This supplement includes added lysine, methionine and threonine intended to support healthy body condition.
SmartHoof® Pellets (SmartPak)
Amino AcidAmino Acid
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
SmartHoof® Pellets by SmartPak is a pelleted hoof supplement containing 25 mg of biotin and methionine, lysine, threonine, and gelatin. This supplement provides the necessary nutrient to grow strong, resilient hooves.
SmartMuscle Mass (SmartPak)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
MuscleMuscle
PerformancePerformance
SmartMuscle® Mass Pellets is an amino acid supplement for horses, containing branched chain amino acids (BCAAs) and whey protein. It is formulated to support muscle development.
SmartPituitary Senior Pellets (SmartPak)
HealthHealth
ImmunityImmunity
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
SmartPituitary Senior Pellets from SmartPak is a pelleted equine supplement intended for aged horses with pituitary issues. This supplement is formulated with chasteberry, Vitamin E, Siberian ginseng, and echinacea intended to support immune function in senior horses.
Solutions 10 Pellet (Right Choice)
Amino AcidAmino Acid
Complete FeedComplete Feed
FatFat
NutritionNutrition
Solutions 10 is a 10% protein and 6% fat pelleted complete feed. This feed is formulated for horses in work and at maintenance. It contains both organic and inorganic sources of minerals, yeast, and added amino acids.

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