Aproximately how much of what do I need to feed a horse to supplement their feed when pasture is not available

In the winter we base our feeding on 1/2 bale per horse per day and 5-10# grain to maintain where ice or snow has prevented us from putting out free choice round bales. A good reference site is horse.purinamills.com/

The nutriton of your horse should be based on the horses workload. Pasture is not just for exercise! Grass contains numerous amounts of minerals that would otherwise have to be supplemented. It depends on the breed and temperment as well. You wouldn't feed a TB high amounts of oats cos its full on energy, TB are highly strung anyway, more energy would make him difficult to handle. Im studying equine science, I will have a look for you, but first tell me some info on your horse, age, sex, body condition, workload etc

It is so hard to answer this question as horses are very variable in their food needs. If a horse is in heavy work the food needs are greater. I know some horses who eat more than four quarts of grain at each meal. However the horse's natual metabolism greatly affects their grain needs. My horse is in heavy work but only gets 3 cups of grain. His metabolism effeciently uses hay which he has free access to in his stall.

Is your horse fat? skinny? or just right? Is he working hard or just a pet?

If he has had no supplemental grain upto now I would start him off slowly, maybe 3 cups with plenty of hay. Then if he drops weight - add more - slowly. The key is to have plenty of hay in front of him all day.

Also - are you in a cold climate? Is he blanketed? A cold horse needs more hay and more grain.

Sorry that you can't get a specific answer but this is a tough call with so many variables.

horses require more nutrion than just pasture grazing! Oats!

Pastures are more for exercise than feeding.

You should ask you vet what is best for your horse.