How much should i feed my horse?

My horse is a 15 year old 15 hand maybe a little under Thoroughbred as of right now he is a little under underweight. I am going to start working him alot more to help him build muscle I would have to say he is a hard keeper. I was thinking 1\4 a pound Beet pulp 1\4 a pound Alfalfa cubes and 1 pound of feed and hay all he can eat. Does that sound about right?

Did you check his teeth? If that is good worming could help. I would just feed a senior feed. The beet pulp could be harder on them and it is just water weight

I just had his teeth done last month and I wormed him about 3 weeks ago

Senior feed is the way to go they is a supplement call wight builder I have see this work on hard to keep horses in there 30's

You are aware most senior feeds have beet pulp in them?

Beet pulp is a GREAT way to put weight on a horse, particularly a senior horse.

According to my Vet, a horse could inhale a 5lb bucket of beet pulp with zero ill affects. He wouldn't suggest you feed that much of it.... but with a horse that loses weight VERY easily, it's great to know that if we have a more strenuous workout than normal, I can give him an extra beet pulp ration midday.

And if it's just "water weight" than holy crap, all the horses at the barn where I board are FULL of water. A once severely emaciated TB has put on over 200lbs since arriving! My Morgan has gained 100lbs and since those two had such great results, all 8 horses (even though none but mine and the TB were in any danger of being considered "thin") at the barn get some beet pulp with their evening meals now.

Just be sure to soak the beet pulp!

A roundbale is the recommended feed around here. Ask my horses, they inhale one a week.