Which of the following is the main source of energy?

The main source of energy for livestock is carbohydrates. Carbohydrates serve as the body's primary fuel source, providing readily accessible energy for metabolic processes. They are essential for sustaining daily activities, growth, and overall health in animals. When consumed, carbohydrates are broken down into simple sugars, which can be used by the body for immediate energy or stored as glycogen for future use.

While lipids (fats) are also a significant energy source and provide more energy per gram compared to carbohydrates, they are primarily utilized in certain conditions, such as when carbohydrate intake is low or during prolonged exercise. In typical feeding scenarios, carbohydrates are the more direct and primary source for energy metabolism.

Minerals and vitamins, on the other hand, do not provide energy themselves but rather play crucial roles in metabolic processes, enzyme functions, and overall health. Therefore, while all these nutrients are vital for animal nutrition, carbohydrates are principally recognized as the main source of dietary energy.