Welcome to the forum! =D
What a fun question! ALL my horses are in light work/training at present. THIS will change as we prepare for our great, family trail ride in SD next summer!! WOOHOO!!
5, 16"3hh KMHSA gelding, eats about 45-55 pounds of alfalfa or alfalfa/grass hay daily, 2 feedings/day/stall, 1 lb/oats in the morning, 3lb 10% sweet feed at night, NO hay when in pasture
5, 15"2hh QH gelding, eats about 45 pounds of alfalfa or alfalfa/grass hay daily, 2 feedings/day/stall, 1 lb/oats in the morning, 3lb 10% sweet feed at night, NO hay when in pasture, just glorious, free-choice grazing!
13, 15"1hh KMHSA mare, eats about 45 pounds of alfalfa or alfalfa/grass hay daily, 2 feedings/day/stall, 1 lb/oats in the morning, 3lb 10% sweet feed at night, NO hay when in pasture
All 3 are fed together when turned out. Each has a rubber bucket, buckets are separated by 12-15 ft., I feed grain on the other side of the fence, lol, and my 5yo KMHSA, who needs more calories is also the herd leader, so he isn't losing any weight from any other bullies.
Remember to measure hay by pounds, not just flakes
The average guide is 1 lb hay/100 lbs horse