A lot of horses get their Carbohydrates from their food. Like if you give your horse sweet feed there's Carbs in that, and on a lot of name brand stuff there's charts on the back of the bags.
They need carbohydrates
Increased carbohydrates and protien.
More Proten And Carbohydrates
increased fat
horses can consume flour. Horses should not eat flour, period. Horses should eat a feed high in digestable fiber and low in carbohydrates and sugars, and good quality forage (hay).
I am sure that most horses have the ability to. But i would not suggest it. Horses digest carbohydrates differently than people do. And as much sugars and other heavy carbohydrates that are in instant oatmeal could cause the horse digestive problems and least of all discomfort.
Horses that are frequently exercised need increased carbohydrates and increased protein. All horses need food, extra water, exercise, a clean stall, and rest. Do not over or under feed your horses, this will harm them. Give them plenty of water, attention, and be sure to ride and groom them!
Howrse answers: Increased carbohydrates and protein
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Yes, carbohydrates are an important source of energy for animals.
Carbohydrates are the primary energy source for herbivores (cows, horses, etc.). Proteins are the primary energy source for carnivores (dogs, cats, etc.).
Horses eat mostly complex carbohydrates, although they get some proteins from the legumes they eat as well as small insects or other animals they accidentally ingest along with the forage. The primary source of protein in horses is actually from dead bacteria from the cecum, where horses have a steady fermentation vat that breaks down the plant material they eat.