I don't change the feeding by much, with the exception of feeding quite a lot more hay. My schedule changes, as in spring/summer/fall the horses are on grass during the day, supplemented with hay. They're in the barn at night, but that's between 6 a.m. and 8 p.m., and they get their concentrates (what little they get) when they come in at 8 p.m.

In the winter the schedule changes significantly. They're turned out between 6 a.m. and 7 a.m. with a minimum of 4 good-sized flakes of hay each for breakfast, another 1 - 3 flakes each for lunch, 2 more flakes plus their concentrates in their stalls when I bring them into the barn at 4 p.m., and another 1 - 2 flakes at 8 p.m., when I top up the water buckets and skip the stalls.

In summer they might eat as little as 2 - 3 flakes of hay per day, whatever it takes to maintain their condition when they're on grass.

Increase grass hay, decrease alfalfa.

We put out round bales for all the horses so they have all the hay they can eat. The hay is mostly grass hay. We also grain any horses that have trouble holding their weight during the winter.