Horse Health

How To Feed Your Newly Adopted Mustang

Source:  The Horse


Mustangs live in a social setting eating a varied array of wild plants that are quite different from the quality hays we typically feed domesticated horses, and certainly he will have had no experience consuming grains.

by Clair Thunes, PhD

BLM mustangs are truly special horses. I’ve had a few as clients but was also lucky enough to own one when I was in graduate school. He came out of the Twin Peaks Herd Management Area as a 2-year-old, and I bought him as a barely started 4-year-old and trained him as a kid’s event horse.

When mustangs come off the range, I would argue that they are more in sync with how horses evolved to live and eat than any domesticated horse. Remember that horses evolved roaming large distances over varied terrain eating native grasses and other plants with low nutritional value. As a result 60% of the horse’s digestive tract volume is dedicated to forage fermentation and—because of that almost constant feed consumption whether eating or not—horses constantly secrete stomach acid and bile. While this way of living is far from the domesticated horse’s reality of most domesticated horses, it has been the reality for your BLM mustang until he came in to the holding pens prior to his adoption.

I encourage all my clients to keep this evolutionary history in mind when thinking about feeding horses, but it’s particularly important for your mustang. He has lived in a social setting eating a varied array of wild plants that are quite different from the quality hays we typically feed domesticated horses, and certainly he will have had no experience consuming grains, even traditional grains such as oats.

Alfalfa’s Benefits 

In the holding pens, alfalfa is generally fed as it is typically easily available and cheaper than grass hay in the Western states. Initially, consider continuing feeding your mustang alfalfa and don’t make changes until he is settled in his new environment. To keep your horse safe and contained, when you first adopt, the BLM requires you to keep your new mustang in a small space with high fencing (so he can’t escape). I imagine that at least initially this means your horse will live alone. Your horse might find this management change and solitary life stressful (although he might not show it), which puts him at risk of developing equine gastric ulcers.

Research has shown that feeding alfalfa (even small amounts) will help buffer stomach acid and could help reduce ulcer risk. Down the road transitioning to a grass hay and some alfalfa or all grass hay would be ideal as it will probably mean you can feed more total pounds of hay which is not only good for digestive health but mental health as well. In the meantime try to keep hay in front of him as much as possible and over time consider training him to eat from a slow feeder which helps mimic natural grazing.

Strategies for Easy Keepers

While there’s always an exception to the rule (mustangs are still horses after all), mustangs are generally very easy keepers an—once settled in to your routine—you might find he gains weight on rations when other horses would not. By using slow feeders you can create a scenario of restricted free-feeding, and he will probably self-regulate his hay intake to about 2% of his body weight. If he’s one of the few horses that can’t self-regulate, you can use a slow feeder to make a reduced hay ration (no less than 1.5% of his body weight) last longer, which might benefit his digestive and mental health.


Make sure your mustang has salt (loose or in block form) available at all times. Be aware that he might not willingly take feed from a bucket (remember: he’s never seen one before!), which might reduce his salt consumption if you have loose salt in a bucket. Using a wide shallow pan might work better.

More on Buckets and Mustangs

A note of experience: I made the mistake when I first got my mustang of putting some alfalfa pellets in a bucket thinking that this might help generate a bond between us. Feed buckets had always been seen as a good thing by every other horse I had owned. Not my mustang! He wouldn’t put his head in a bucket. When I thought about this, it was obvious: First of all he had never seen a bucket, or hay pellets for that matter. Second of all, why would a flight animal that relies on sight put its head in a bucket that reduces its ability to see? He did eventually get over this bucket phobia.

While this is one of those funny sorts of quirks you might run in to with your mustang the bucket issue can be a real issue if your barn only provides water through water buckets, or small automatic waterers. The sound of the automatic water refilling can easily scare an already-on-edge mustang. Coupled with not understanding buckets in general, this might lead to inadequate water consumption. It’s likely you’re your mustang has encountered water troughs in holding pens or on the range, and using a trough is preferable until he can be taught to understand buckets and automatic waterers.

Make sure he cannot knock the trough over, though. Once over his fear he might want to play with the water as if they’re puddles, streams, or ponds!


At some point, just as with any other horse, you’ll need to add a source of vitamins and minerals and possibly quality protein to your mustang’s diet. A commercially available ration balancing feed is a good choice due to their low calorie content. Or, an even lower-calorie supplement fed in some hay pellets would be a good option.

Read the rest of this article HERE.

2 replies »

  1. Good information and although I am not at all a horse expert … may I add that just spending time with them will teach you a lot. If you listen to them and watch them they will “tell” you what they want and need, both socially (do they need companionship or a herd “family”?) and physically (do they need more exercise and play time and grazing time?). I have spent hours and hours just watching ACE … until he probably thought I was some sort of weirdo … HaHa … but he did become more accepting and trusting toward me even though he will always be wild. Wild horses are intelligent and very intuitive and your body language speaks volumes to them. Without their intelligence and intuitiveness they would never have survived in the wild for hundreds and thousands of years. I have heard that one of the best things is to just go sit with them … take a chair and a book with you if you wish. They will learn to accept and trust you with your added non-stressful shared time and it will pay off far more than chasing them around in a round-pen to show them you are the boss… none of us like that kind of attitude toward us and none of us learn to trust those that try to bully us. Being asked and being bullied into responding are far different things. When in doubt … take your clues from their wild natural lifestyle and just appreciate your chance to be part of their life. My humble opinion.


  2. Have learned much by reading this article. Have never owned a horse. Do care about their well-being. The “wild mustangs,” should remain in the wild. Thank you for sharing this information.


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