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Purina Animal Nutrition

Purina® Ultium® Growth Horse Formula

Purina® Ultium® Growth Horse Formula

Purina® Ultium® Growth Horse Formula was conceptualized after the Purina new product development team completed their successful launch of the original Ultium® Competition Horse Formula. The Ph.D. nutritionists at the Purina Equine Research Unit in Gray Summit, Missouri knew the advantages of feeding meticulously formulated, higher fat and fiber feeds to competitive athletes. But could the same principles be applied for young growing horses? Since then, research spanning over four years was performed to develop a new feed formulated specifically for young growing athletes. Purina performed detailed scientific feeding trials on broodmares and young horses from multiple foal crops at varying ages, breeds and management situations. The research involved monitoring and measuring growth curves, body condition, joint health, activity levels, blood work and more to ensure optimal nutrient delivery to broodmares and growing horses. The result was unique, industry-leading nutrition proven to support the development, growth and adaptive physiology necessary to produce a strong, healthy athletic horse. It’s another offering of advanced nutrition worthy of the Purina name. Purina® Ultium® Growth Horse Formula. It’s What It Takes®.
Regular price $38.49 USD
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Sustained Energy System®

A unique blend of three fuel sources to provide a steady level of highly digestible energy for developing and growing foals: soluble carbohydrates, fats and fermentable fiber

Targeted Nutrition Delivery System

Transports repair nutrients where they’re needed most. The balance of nutrients supports proper joint and long bone maturity to set the stage for the young athlete to start off right and continue on the correct path to competition.

Backed by Years of Research

Including measuring growth curves, body condition, joint health, activity levels and blood work in young, growing horses.

Purina® Amplify® High-Fat Nugget

A proprietary blend of vegetable oils, flax seed and rice bran helps promote balanced immunity, smooth growth rates and shiny coats

Optimized Amino Acid Profile

Includes essential amino acids Lysine, Threonine and Methionine and branched chain amino acids to support muscle development and growth

Highly Digestible Fibers

Including beet pulp and soy hulls provide fermentable fiber to the hindgut for a slow-release calorie source that helps support weight maintenance and consistent lactation in broodmares and steady growth in young, growing horses.

Added Vitamins and Minerals

Including Copper, Zinc, Calcium and Phosphorus in essential ratios and quantities to help assure proper fetal stores during gestation, milk levels during lactation and tissue concentrations for continued growth

Added Antioxidants

Including Vitamins E and Selenium help support cellular metabolism and a strong immune system

Controlled Sugar and Starch

With higher levels of fat and digestible fiber may help reduce the risk of hindgut disturbances associated with high starch feeding practices

Nutrient-Dense Blend

With Pellets and Purina® Amplify® High-Fat Nuggets is highly palatable and highly digestible for young horses and broodmares

Concentrate Feed

Designed to be fed with hay or pasture

Outlast® Gastric Support Supplement

Scientifically shown to support gastric health and comfort, proper pH and provides an optimal source of calcium for proper bone growth.

NutrientMin / MaxAmount
Crude ProteinMIN15.50 %
LysineMIN1.00 %
MethionineMIN0.48 %
ThreonineMIN0.55 %
Crude FatMIN9.50 %
Omega-3 Fatty AcidMIN0.50
Omega-6 Fatty AcidMIN2.00%
Crude FiberMAX13.00%
Acid Detergent Fiber (ADF)MAX16.00 %
Neutral Detergent Fiber (NDF)MAX28.00 %
Dietary StarchMAX15.00 %
SugarsMAX8.00 %
Calcium (Ca)MIN1.40 %
Calcium (Ca)MAX1.90 %
Phosphorus (P)MIN0.70 %
Sodium (Na)MAX0.60 %
Magnesium (Mg)MIN

0.35 %

PotassiumMIN1.25 %
Copper (Cu)MIN90.00 PPM
Selenium (Se)MIN0.60 PPM
Selenium (Se)MAX0.72 PPM
Zinc (Zn)MIN270.00 PPM
Vitamin AMIN3400 IU/LB
Vitamin D3MIN800 IU/LB
Vitamin EMIN150 IU/LB


Ultium® Growth Horse Formula contains a concentrated calorie delivery system that supports the mare through all stages of gestation, with more total calories from added fat and fiber and lower sugar and starch. Lower feeding rates help support digestive health during this essential time.

Your foal’s best start begins with proper fetal development. Ultium® Growth Horse Formula provides research-determined amounts of nutrients, including copper and zinc for developing fetal liver stores to set the foundation for correct growth.

Suckling foals may nurse up to 80 times per day. Ultium® Growth Horse Formula provides additional milk components to support immune function, calorie, and nutrient transfers to active, growing foals.

Lactating mares can require over 35,000 kcal/day to produce adequate milk and maintain body condition. The concentrated calorie delivery system of Ultium® Growth Horse Formula provides the necessary calories during this critical period for both mare and foal sustenance.

Ultium® Growth Horse Formula helps support strong bone development by using high-quality nutrient sources. Amino acids, vitamins and minerals are supplied in optimal amounts and ratios as determined by research studies to provide the necessary building blocks for bone growth.

Young growing horses need carefully-balanced nutrition for optimal muscle development to grow into successful athletes. The protein quality and amino acid fortification of Ultium® Growth Horse Formula supports in the foundation, maturation and maintenance of healthy muscle.


Start with the amounts of Ultium® Growth Horse Formula given for the weight and life stage of the horse. After observing the horse for a period of time, the amount fed may be gradually increased or decreased to obtain desired body condition and weight. For feeding directions outside the ranges addressed in these feeding charts, please contact your local Purina retailer or Purina Customer Service at 800-227-8941.

Weight of Horse in Pounds
Minimum Hay or Equivalent Pasture*9.5012.0014.5017.00
Ultium® Growth Horse Formula**(lbs/day)
Gestating Mare (last 90 days)
Lactating Mare***6.07.509.0010.50


Weight of Horse in Pounds
GROWING HORSES4005006007008009001,000
Minimum Hay or Equivalent Pasture*
Ultium® Growth Horse Formula**(lbs/day)
Weanlings, Yearlings, and 2 Year Olds7.00-7.756.25-8.356.75-9.007.00-9.007.25-9.007.00-8.756.75-8.50

* This is the recommended minimum amount of hay to be fed. If feeding more hay, you may reduce the feeding rate of Ultium® Growth Horse Formula to maintain appropriate body condition.
** To meet nutrient requirements, do not feed less than 0.35 lbs. per 100 lbs. bodyweight (BW) per day (3.5 lbs. per 1,000 lbs. BW) for gestating mares, 0.50 lbs. per 100 lbs. BW for lactating mares or 0.75 lbs. per 100 lbs. BW per day for growing horses (3.75 lbs. per 500-lb. BW). If your horse gains too much weight at the minimum feeding rate, transition to Purina® Enrich Plus® Ration Balancing Feed.
*** Recommended minimum amount of hay to be fed to lactating mares is 2 lbs. per 100 lbs. BW per day (20 lbs. per 1,000 lbs. BW).
**** Use the lower feeding rate for moderate growth rate and the higher feeding rate to support more rapid growth.
NOTE: Feeding rates of Ultium® Growth Horse Formula and forage may be adjusted or feed may be top-dressed with Purina® Amplify® High-Fat Supplement for additional calories.
SUCKLING FOALS: Begin offering feed within two weeks of birth. Feed 1.0 lb. of Ultium® Growth Horse Formula per month of age per day.

A 4-pound meal of Ultium® Growth Horse Formula supplies a full serving of Outlast® Supplement. 



Follow label directions. Feeding added selenium resulting in total diet levels in excess of 0.3 ppm is prohibited.


  1. Feeding rates will vary with size, age, temperament, health status, forage quality, climate and activity level. Feed at regular times, at least twice daily. Do not feed more than 0.5 lbs/100 lbs of body weight per meal. Do not feed free-choice. Prevent rapid eating by the horse of any feedstuff.
  2. Reduce and/or delay feeding a horse which is hot, excited or showing pain, has fever or diarrhea. Consult your veterinarian if any problems arise.
  3. Always feed a minimum of 1.0 to 1.2 lbs per 100 lbs of body weight of good quality clean hay or the equivalent in pasture.
  4. Any feed changes should be made gradually over a period of 7 to 10 days. Changes in the rate of feeding should not exceed 1.0 lb per day for each horse.
  5. Provide fresh, clean water at all times. Provide your horse with access to salt. Consult with your veterinarian regularly and maintain a routine dental, parasite control and health care program for your horse.

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