Keep future equine athletes a step ahead with Ultium® Growth, a unique horse feed that supports development, growth and adaptive physiology for a strong, healthy, athletic horse. A growth feed like no other, it was created by Ph.D. nutritionists and veterinarians who conducted over four years of scientific feed trials on broodmares and young horses of different ages, breeds and management situations. With Amplify® High-Fat Nugget to promote ideal body condition, and Outlast® gastric support supplement, your elite athlete will have what it takes to stay a step ahead of the rest.

Features & Benefits

Sustained Energy System®

From fats, fermentable fibers and soluble carbohydrates to meet the elevated calorie needs of growing horses and pregnant or lactating mares

Targeted Nutrition Delivery System

Transports nutrients like copper, zinc, calcium and phosphorus to where they are needed most, to support proper joint and long bone development

Amplify® High-Fat Nugget

A proprietary blend of fatty acids from vegetable oils, flaxseed and rice bran that maintains body condition in lactating mares and healthy bloom in growing horses

Outlast® Gastric Support Supplement

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

Precise Amino Acid Profile

With lysine, methionine, threonine and branched-chain amino acids to support muscle development and growth

Multiple Fermentable Fibers

Including beet pulp and soy hulls to support a healthy gut microbiome in the developing hindgut of young horses and contains less sugar and starch


Min / Max
Crude Protein
15.50 %
1.00 %
0.48 %
0.55 %
9.50 %
Omega-3 Fatty Acid
0.50 %
Omega-6 Fatty Acid
2.00 %
Crude Fiber
13.00 %
Acid Detergent Fiber (ADF)
16.00 %
Neutral Detergent Fiber (NDF)
28.00 %
Dietary Starch
15.00 %
8.00 %
Calcium (Ca)
1.40 %
Calcium (Ca)
1.90 %
Phosphorus (P)
0.70 %
Sodium (Na)
0.60 %
Magnesium (Mg)
0.35 %
Potassium (K)
1.25 %
Copper (Cu)
90.00 PPM
Selenium (Se)
0.60 PPM
Selenium (Se)
0.72 PPM
Zinc (Zn)
270.00 PPM
Vitamin A
3,400 IU/LB
Vitamin D3
800 IU/LB
Vitamin E
150 IU/LB
Wheat Middlings, Dehulled Soybean Meal,
Ground Corn, Sun Cured Alfalfa, Ground Soybean
Hulls, Heat Stabilized Rice Bran, Dried Plain Beet
Pulp, Cane Molasses, Vegetable Oil, Calcium
Carbonate, Flaxseed, Soybean Oil, Lignin
Sulfonate, Seaweed-Derived Calcium, Magnesium
Oxide, Salt, Monocalcium Phosphate, Dicalcium
Phosphate, L-Lysine, DL-Methionine, Citric Acid,
Dried Whey Solubles, Choline Chloride, Colored
with Iron Oxide, Vitamin E Supplement, Thiamine
Mononitrate, Propionic Acid (a Preservative),
Copper Sulfate, Zinc Oxide, Iron Oxide, Vitamin A
Supplement, Citric Acid (a Preservative), Calcium
Pantothenate, Pyridoxine Hydrochloride, L-Lysine
Monohydrochloride, Natural Flavor, Artificial
Flavors, Ferrous Carbonate, Vitamin D3
Supplement, Manganous Oxide, Tocopherols,
Riboflavin Supplement, Vitamin B12 Supplement,
Rosemary Extract, Lecithin, Niacin Supplement,
Riboflavin-5-Phosphate, Calcium Iodate,
L-Threonine, L-Tryptophan, Cobalt Carbonate,
Sodium Selenite.
Soy Hulls 8%

Feeding Directions

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
BROODMARES 800 1,000 1,200 1,400
Minimum Hay or Equivalent Pasture* 9.50 12.00 14.50 17.00
Ultium® Growth Horse Formula** (lbs/day)
Gestating Mare (last 90 days) 4.25 5.25 6.0 7.0
Lactating Mare*** 6.0 7.50 9.00 10.50
Weight of Horse in Pounds
GROWING HORSES 400 500 600 700 800 900 1,000
Minimum Hay or Equivalent Pasture* 4.00 6.00 7.00 8.50 9.50 11.00 12.00
Ultium® Growth Horse Formula** (lbs/day)
Weanlings, Yearlings, and 2 Year Olds 7.00-7.75 6.25-8.35 6.75-9.00 7.00-9.00 7.25-9.00 7.00-8.75 6.75-8.50

* 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.