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Calcium - Feed Ingredient

Calcium is an essential macromineral required for numerous physiological functions in horses, including bone formation, muscle contraction, nerve transmission, and enzyme activation. It is a primary structural component of bones and teeth, with approximately 99% of the body’s calcium stored in the skeletal system.

In equine nutrition, calcium is commonly supplied through feed ingredients such as limestone (calcium carbonate) or dicalcium phosphate. It can also be added to feed formulations via high calcium feeds like alfalfa.

The following equine feeds, supplements and products contain Calcium 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.
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.
Optimum Probiotic (Mad Barn)
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
ProbioticProbiotic
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.
Performance XL: Electrolytes (Mad Barn)
Competition HorsesCompetition Horses
ElectrolyteElectrolyte
PerformancePerformance
StaminaStamina
Performance XL: Electrolytes by Mad Barn is a scientifically formulated equine electrolyte supplement designed to support athletic performance and workout recovery. It contains an ideal blend of natural minerals and vitamins to promote hydration status and muscle function.
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.
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.
OmegaPro (Hestevard)
Gut HealthGut Health
HealthHealth
JointsJoints
Omega 3-6-9Omega 3-6-9
OmegaPro by Hestevard is a pelleted supplement containing Omega 3 and 6. It is intended to help control inflammation and maintain overall health in horses and ponies.
OMG (Dove Performance Nutrition)
Mineral BalanceMineral Balance
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
OMG from Dove Performance Nutrition is a pelleted feed ration for horses. It contains vitamins, minerals, protein, fiber and fat.
Omolene #300® Growth Concentrate (Purina Mills)
BroodmareBroodmare
Complete FeedComplete Feed
FoalFoal
LactationLactation
Omolene 300 Growth is a textured feed designed for foals, weanlings, yearlings and mares in gestation or lactation. It contains 16% crude protein, 6% crude fat and 7% fibre.
Omolene 200 Performance RT (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
Competition HorsesCompetition Horses
GrowthGrowth
Purina® Omolene® #200 RT is a textured feed intended for performance horses, providing 6% fat and 14% fibre. Energy sources include whole grains and a soy oil-molasses blend.
Omolene 400 Complete Advantage (Purina)
DigestionDigestion
ExerciseExercise
Gut HealthGut Health
UlcersUlcers
Purina® Omolene® #400 Complete Advantage is a textured complete feed intended for active pleasure and senior horses. It contains beet pulp shreds, vegetable oils, and a soy oil-molasses blend to improve palatability.
Omolene 400 Complete Advantage RT (Purina)
DigestionDigestion
ExerciseExercise
Gut HealthGut Health
UlcersUlcers
Purina® Omolene® 400 Complete Advantage RT is a textured feed intended for performance horses. It is a calorie-dense blend of 8% fat, 16% fibre and grains.
Omolene 500 Competition (Purina)
Competition HorsesCompetition Horses
DigestionDigestion
EnergyEnergy
NutritionNutrition
Omolene #500® Competition is a textured feed intended for performance and endurance athletes and horses in heavy work. It provides a higher energy density with 8% fat.
Omolene Maternity 300 (Purina Canada)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Purina Omolene Maternity 300 is a textured horse feed intended for broodmares, nursing and growing foals. It provides higher amino acid content to support growth and development.
Omolene Progression 200 (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
PerformancePerformance
StallionStallion
Omolene Progression 200 is a textured feed intended for performance horses, growing horses and gestating mares. It supplies 14% protein and 7% fat from ingredient sources including soybean meal, soybean oil, whole oats, flaked barley and extruded corn.
Omolene Senior Action (Purina)
ExerciseExercise
PerformancePerformance
Ration BalancerRation Balancer
SeniorSenior
Omolene Senior Action is a complete textured feed formulated for active senior horses. It provides 14% protein, which may support muscle tone in senior horses that are not receiving enough protein from their forage.
Omolene Sport Plus (Purina)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Purina Omolene Sport Plus is a textured complete feed intended for horses in heavy work including racehorses. It provides 8% fat from vegetable oils and contains beet pulp as a high pectin fibre source.
Omolene® #100 Active Pleasure Horse Feed (Purina Mills)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
ExerciseExercise
Gut HealthGut Health
Omolene 100 Active Pleasure Horse Feed is a textured feed targeted to horses in maintenance to moderate work. It provides 10% crude protein, 10% fibre and 4.5% fat.
Omolene® #200 Performance Horse Feed (Purina Mills)
Complete FeedComplete Feed
ExerciseExercise
Gut HealthGut Health
PerformancePerformance
Omolene 200 Performance Horse Feed is a textured feed targeted to performance horses, broodmares in gestation and lactation, and breeding stallions. It contains added fat, carbohydrates, and molasses to support high caloric needs.
Omolene® #400 Complete Advantage (Purina Mills)
Complete FeedComplete Feed
ExerciseExercise
FiberFiber
SeniorSenior
Omolene 400 Complete Advantage is a textured horse feed for active and senior horses. It contains highly digestible fibre from beet pulp and fat from vegetable oils, flax seed and rice bran.
One’N Only (Wendlands)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
One'N Only by Wendlands is a total mixed ration formulated to replace traditional concentrates and supplements. It can also be fed as a hay extender to help meet forage needs.
OneCup for Horses (GWF Nutrition)
Easy KeeperEasy Keeper
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
OneCup for Horses by GWF Nutrition is a pelleted ration balancer that intends to provide the vitamins and minerals necessary to maintain an easy-keeper. It contains 22 vitamins and minerals.
Opti-Ferm Horse Tub (ClariFly) (Kalmbach Feeds)
Caloric EnergyCaloric Energy
HealthHealth
NutritionNutrition
Skin + HairSkin + Hair
Opti-Ferm Horse Tub with Clarifly by Kalmbach Feeds is an energy, vitamin and mineral supplement lick. It contains Diflubenzuron, which reduces the emergence of flies from manure.
Opti-Ferm Horse Tubs (Kalmbach Feeds)
Caloric EnergyCaloric Energy
FlavorFlavor
Mineral BalanceMineral Balance
NutritionNutrition
Opti-Ferm Horse Tub by Kalmbach Feeds is an energy, vitamin, and mineral supplement lick. It contains added molasses and fat for palatability and 10 mg/lb of added biotin for hoof health.
Opti-Ferm Lix 16% All Stock (Kalmbach Feeds)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Opti-Ferm Lix 16% All Stock by Kalmbach Feeds is an energy, vitamin, and mineral supplement tub. It is intended for cattle, sheep, horses, and goats on moderate to high quality forage.
Opti-GROW Foalstarter (Havens Horsefeed)
Caloric EnergyCaloric Energy
FoalFoal
GrowthGrowth
ProteinProtein
Opti-GROW Foalstarter by Havens Horsefeed is intended for foals up to 18 months of age. It contains 16% protein and include ingredients such as wheat, soybean meal, corn gluten feed, and whey powder.
Optima (Banks Mill Feeds)
Grain FreeGrain Free
Gut HealthGut Health
Metabolic SyndromeMetabolic Syndrome
Omega 3-6-9Omega 3-6-9
Optima-LA from Banks Mill is a low starch pelleted feed intended for horses at all life stages. It provides energy from soybeans, wheat middlings, alfalfa meal, beet pulp, dried molasses, flax, and vegetable oil.
Optimize (Uckele)
FiberFiber
Low NSC FeedsLow NSC Feeds
MetabolismMetabolism
NutrientsNutrients
Optimize is a pelleted ration balancer with a feeding rate of 1-2 lbs per day. It is formulated for horses needing a low starch and sugar diet, such as horses with metabolic disorders. The NSC content in this ration balancer is 7.8%
Optimum (NAF Equine)
Easy KeeperEasy Keeper
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
Optimum by NAF Equine is a pelleted ration balancer that is formulated to provide the vitamins and minerals for a high-fiber and low concentrate diet or a performance diet.
Optimum EQ 2.0 (BioStar)
Bone HealthBone Health
HealthHealth
Mineral BalanceMineral Balance
PerformancePerformance
Optimum EQ 2.0 by BioStar is a vitamin and mineral supplement containing amino acids and mineral proteinates.
Optimum GI (BioStar)
DigestionDigestion
Gut HealthGut Health
HealthHealth
ImmunityImmunity
Optimum GI from BioStar is a powdered gut health supplement. Optimum GI contains vitamins, antioxidants, minerals and fatty acids intended to support digestion and overall horse health.
Optimum Senior JS 2.0 (BioStar)
HealthHealth
JointsJoints
NutritionNutrition
RecoveryRecovery
Optimum Senior JS 2.0 by BioStar is a powdered vitamin and mineral supplement formulated to support joint health in senior horses. It contains glutamine as well as the omega-3 fatty acids EPA and DHA.
Optimus Equine Feed (Equus Optimus)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Optimus Equine Feed by Equus Optimus is a complete feed containing Figuerola EquineSaver. It is intended to support overall health in all horse types.
Orange Superior (DAC)
MetabolismMetabolism
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Orange Superior is a vitamin and mineral supplement that can be given to any mature horse, and is meant to support metabolic functions, energy balance, and also provides probiotics.
Original 12 Textured (McCauley’s Equine Formulas)
BroodmareBroodmare
Complete FeedComplete Feed
LactationLactation
StallionStallion
Original 12 Textured is a palatable oat-based feed targeted to broodmares and stallions. It is formulated with added yeast and organic minerals. It is designed to promote healthy gut function.
Original 14 Pelleted (McCauley’s)
Feed EfficiencyFeed Efficiency
GrainsGrains
GrowthGrowth
NutritionNutrition
McCauley's Original® 14 Pelleted is a pelleted horse feed with 14% protein to meet the needs of breeding and growing horses. This oat-based formula contains 3.5% fat and 12% fibre.
Original 14 Textured (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
GrowthGrowth
HealthHealth
LactationLactation
McCauley's Original 14 Textured is an oat-based feed for stallions, breeding, growing, and performance horses. It is fortified with organic minerals and contains yeast for digestive health.
Original 16 Textured (McCauley’s Equine Formulas)
BroodmareBroodmare
Feed EfficiencyFeed Efficiency
FoalFoal
LactationLactation
McCauley's Original 16 Textured is an oat-based horse feed for breeding and growing horses. It contains higher protein (16%) to meet the needs of growing yearlings and lactating broodmares.
Original Balancer (Horslyx)
Easy KeeperEasy Keeper
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
Original Balancer from Horslyx is intended to balance nutrient deficiencies in horses and ponies who eat primarily forage or grass. This product contains cane molasses to help palatability and biotin to support hoof health.
Original Feed Balancer (Blue Chip Feed)
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
YeastYeast
Original Feed Balancer from Blue Chip Feed is a pelleted ration balancer intended for all horses and ponies at any work level. This balancer is designed to support digestive, hoof, skin, coat, and respiratory health.
Original Multi Balancer (Spillers Feeds)
Gut HealthGut Health
Hoof HealthHoof Health
ImmunityImmunity
Ration BalancerRation Balancer
VitaminsVitamins
The Original Multi Balancer from Spillers Feed is cereal grain-free, low in sugars, and low in starches. This feed is high in Vitamins and minerals such as Vitamin A, Vitamin D3, Vitamin E, Copper, and Zinc.
Original Performance Formula (Wilson Feeds)
HealthHealth
NutritionNutrition
PerformancePerformance
Ration BalancerRation Balancer
Original Performance Formula by Wilson Feeds is a soy-free supplement intended to fill nutritional gaps of horses on a forage-based diet.
Original® 12 Pelleted (McCauley’s Equine Formulas)
BroodmareBroodmare
Feed EfficiencyFeed Efficiency
Ration BalancerRation Balancer
StallionStallion
McCauley's Original® 12 Pelleted is a palatable and digestible oat-based feed for broodmares and stallions. It provides 12% protein, 12% fiber, 3.5% fat, and contains organic minerals.
Original® 16 Pelleted (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
FoalFoal
GrowthGrowth
LactationLactation
Original® 16 Pelleted is an oat-based feed targeted to breeding horses and yearlings. It provides 16% crude protein and is formulated for growing horses.
Orphan Foal Supplement (Dunstan)
FoalFoal
GrowthGrowth
NutrientsNutrients
ProteinProtein
Orphan Foal by Dunstan is a palatable, digestible feed intended for introducing foals to solid feed. It is a blend of milk powder, vegetable proteins, cereals, vitamins and minerals. It is intended to encourage the transition from milk to solid diet.
Osceola 10 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 10 is a textured feed with corn, oats, and molasses for mature pleasure horses with a high 48% NSC (sugar & starch) content. This feed contains yeast culture and antioxidants.
Osceola 12 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 12™ is a textured grain-based feed with high NSC levels (44%) intended for mature pleasure horses. Energy sources include corn, oats, wheat, soybean meal and cane molasses.
Osceola 14 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 14™ is a textured feed with higher protein levels for growing, breeding, or performance horses. It has a high NSC value of 39% from grain-based ingredients.
Oste:Form (Equestrizone)
Bone HealthBone Health
IngredientIngredient
JointsJoints
PerformancePerformance
Oste:Form from Equestrizone is an equine supplement containing essential nutrients for bone metabolism in growing and mature horses. Oste:Form contains Vitamin K, Vitamin D and calcified seaweed to support bone density.
Osteo-Gen (Equi-Force)
Bone HealthBone Health
ExerciseExercise
GrowthGrowth
JointsJoints
Osteo-Gen is a supplement that is intended to promote bone health and cartilage repair. It is suitable for horses of all ages and work levels.
Outlast Gastric Support Supplement (Purina)
ColicColic
DigestionDigestion
Gut HealthGut Health
UlcersUlcers
Purina® Outlast® Gastric Support Supplement is an equine gut product designed to support gastric health and pH balance. The primary active ingredients include alfalfa and seaweed-derived calcium.
Outshine (Baileys Horse Feeds)
Coat QualityCoat Quality
FatFat
NutritionNutrition
Omega 3-6-9Omega 3-6-9
Outshine by Baileys Horse Feeds improves coat quality and supports horses who need slow-release calories for weight gain. This supplement contains Omega-3 and Omega-6 fatty acids.
Oyster Shell – Ground
Bone HealthBone Health
CardiovascularCardiovascular
IngredientIngredient
MuscleMuscle
Ground oyster shells are sometimes used in livestock feeds as a soluble source of calcium. It is primarily used in the diets of egg-laying chickens.
Parkmore Special Vitamin/Mineral Pelleted Supplement (Parkmore Supplements)
HealthHealth
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Parkmore Special Vitamin/Mineral Pelleted Supplement is a trace mineral and vitamin supplement designed for all ages and working classes of horses. It can be fed in addition to grain or on its own.
Pastime (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
HealthHealth
NutritionNutrition
Ration BalancerRation Balancer
Pastime is an oat-based pelleted feed for adult horses at maintenance or in light work. It targets pleasure horses with lower energy density and fat content.
Pasture Cubes (Dodson & Horrell)
Complete FeedComplete Feed
GrainsGrains
HerbHerb
NutritionNutrition
Pasture Cubes by Dodson & Horrell is a feed that is lower in protein and has an elevated fibre level. This feed is for horses and ponies that need some additional fibre and vitamins, and minerals in their diet.

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