Which essential nutrient supports a horse's energy needs during work?

The nutrient that primarily supports a horse's energy needs during work is carbohydrates. Carbohydrates are crucial because they are the body's primary source of energy. When horses engage in physical activities, their muscles require glucose for fuel, which is derived from carbohydrates.

Carbohydrates can be found in various feed sources such as grains and hay. Once consumed, they are broken down in the digestive system into glucose. This glucose is then either used immediately for energy or stored as glycogen in the liver and muscles for later use.

While fats and proteins do contribute to overall energy and nutrition, carbohydrates are the most readily utilized source during intense physical exertion. Fats provide a dense energy source but are metabolized more slowly, and protein is mainly used for muscle repair, growth, and maintenance rather than as a primary energy source. Vitamins are essential for many biochemical processes in the body, but they do not provide energy directly. Therefore, carbohydrates are essential in meeting the energy needs of a horse during work.