sure, but you must be careful so it doesn't colic
carrots
You buy minerals and add it to the feed, or you get a red(mineral) salt lick that is always accesible to a horse.
give them a mineral block or feed them a vet recommended supplement.
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Give it Calorific mash.
When your horse needs minerals and you want to help, consider the following methods of helping: 1) Giving your horse salt licks (otherwise known as salt stones) and other mineral licks will help a lot. Your horse will lick as much as s/he needs, and you don't have to worry about getting the right amount perfect. However, some horses have a problem, in which they lick so much salt that they become ill. Very few horse are salt/mineral addicts, and so this choice is one of the best. 2) Let your horse graze in a fresh pasture. Most of the time, fresh forage has a lot more minerals than hay and oats. However, you should check if your area's soil has a good amount of minerals or not. Sometimes areas have too much, and other times they have too little. 3) I do not recommend this particular method, because you can add too much or too little to your horse's diet. You can buy minerals supplements and add them to your horse's feed. Again, I don't recommend this. I hope that your horse is supplied with all the minerals needed. However, I must ask: Are you sure that your horse needs them? Check with a vet before you do anything, and see what s/he recommends.
You can give the horse a mineral block to lick. These are sold in feed stores and come in many varieties and sizes.
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Yes, you should.
The easiest way is to provide a mineral salt block free choice for your horse to lick. These can be purchased from any reputable farm supply store or horse feed store.
If a horse is lacking minerals in it's diet you can add a mineral supplement either in a block form or in a loose form. If the mineral supplement does not seem to work you can also add a pelleted ration balancer or mineral enhanced feed. It is always recommended to consult with a equine veterinarian regarding any dietary changes.
Hopefully, your vet. told you that your horse was suffering from a lack of minerals in it's diet. If so, the supplement that you mention, (if recommended by your Vet.) would be what I would also recommend, using it for the time he suggested. Then I'd get my Vet. to double check my horse, if and when they give you a clean bill of health, I'd stop the supplement. Only then, are you workig with a clean slate. But you need to remember that your horse got this way on his current diet. I would ask what you should do after you stop the supplement. Maybe once the problem is solved, you can prevent it from recurring by using the mineral block, giving your horse daily access to it. That should prevent the problem, but solving the problem might be another matter, depending on how bad and urgent it is, so do what the vet. recommended. Then start prevention steps.