Purina® Omolene #400® Complete Advantage Horse Feed

Purina® Omolene #400® Complete Advantage Horse Feed

Now with Outlast®​ Gastric Support Supplement

Complete feed with built-in forage for breeding and competition horses

It took over 100 years of industry-leading research and innovation to build today’s Purina® Omolene® horse feed lineup. We started with naturally nutritious high-quality whole grains packed with antioxidants, phytonutrients and prebiotic fibers. From there, countless nutrition studies and feeding trials at the Purina Animal Nutrition Center led to scientific breakthroughs that keep our formulas on the cutting-edge of equine nutrition and performance. Because only innovations proven to have the highest level of performance and safety earn their place in Purina® Omolene® horse feeds, you can feed with full confidence. Whether you need to fuel intense competitive performance, support your horse’s gastric health or nourish the growth of the next generation of equine athletes, Omolene® feeds are built to help solve your toughest nutritional challenges.

When there’s greatness on the inside, it shows on the outside.

Features & Benefits

Highly Digestible Fiber

A calorie dense complete feed with a blend of fiber sources to partially or totally replace forage

Gastric Support 

Formulated with Outlast® Supplement to support gastric health and proper pH

Healthy Appearance

Contains Purina® Amplify® high fat nugget to maintain body condition shine and bloom

Low Dust Ingredients

Designed for horses with respiratory or dietary sensitivity, this formula contains no barley, oats, or alfalfa

Purina® Amplify® High-Fat Nugget

A proprietary blend of vegetable oils, flaxseed, and rice bran to support weight gain, endurance, shine, and bloom

Loose Beet Pulp Shreds

An excellent source of fermentable fiber for sustained energy

Complete Feed

Roughage built-in to partially or completely replace hay or pasture, this formula provides 100% of the required vitamins and minerals when fed as directed.*

*When fed as directed, with free-choice or added salt, based on Nutrient Requirements of Horses. Sixth Revised Edition – 2007, published by the National Research Council.

Year-Round Quality

Unique soy oil-molasses blend with lower sugar and higher fat than traditional cane molasses helps decrease bricking in winter and drying out in summer

Proven Palatability

Countless trials at the Purina Animal Nutrition Center and in the field verify exceptional palatability to support consistent nutrient intake, even in the pickiest eaters

Ingredient Integrity

Only ingredients that meet our stringent quality criteria make it into our mills and feed bags. Any shipment that doesn’t meet or exceed our standards is turned away.


Min / Max
Crude Protein
12.00 %
0.50 %
Crude Fat
5.50 %
Crude Fiber
18.00 %
Calcium (Ca)
0.80 %
Calcium (Ca)
1.30 %
Phosphorus (P)
0.40 %
Copper (Cu)
35.00 PPM
Zinc (Zn)
140.00 PPM
Vitamin A
3000 IU/LB
Vitamin E
100 IU/LB
Selenium (Se)
0.30 PPM
Neutral Detergent Fiber (NDF)
35.00 %
Acid Detergent Fiber (ADF)
21.00 %

Feeding Directions

FEEDING DIRECTIONS WITH HAY OR PASTURE:  Start with the amounts of Omolene® 400 Complete Advantage® given for the weight and lifestyle of the horse. After observing the horse for a period of time, the amount fed may be gradually increased or decreased to obtain the 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.

Lifestyle Weight of Horse in Pounds
| 800 1,000 1,200
| Omolene® 400 Horse Feed (lbs/day)*
Maintenance  8.75 10.75 13.00
Light Work 10.50 13.00 15.50
Moderate Work 12.25 15.00 18.25
Early Gestation (first 250 days) 9.00 11.00 13.25

*Omolene® 400 contains high-quality roughage and can be fed without hay. If fed with hay, the feeding rates of Omolene® 400 can be reduced. To meet nutrient requirements, do not feed less than 0.6 lbs per 100 lbs of body weight per day (6 lbs per 1000-lb horse) of Omolene® 400. To meet fiber requirements, do not feed less than 1.2 lbs/100 lbs of body weight per day of Omolene® 400 and hay or pasture equivalent combined. 
Changing To
  • Make the feed change gradually over a period of 7 to 10 days.
  • Mix the new feed with the old, gradually increasing the amount of the new feed while decreasing an equal amount of the old.
  • Changes in the rate of feeding should not exceed 1 pound per day for each horse.
Store in a dry, well-ventilated area protected from rodents and insects. Do not feed moldy or insect-infested feed to animals as it may cause illness, performance loss or death.
  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.  When fed as a complete feed, a minimum of three meals per day is recommended. Do not feed more than 0.8 lbs/100 lbs (8 lbs per 1000-lb horse) 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. 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.
  4. 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.