What type of feed is typically high in energy and low in fiber?

The correct answer is Concentrates. Concentrates are a type of feed that are characterized by their high energy content and low fiber levels, making them particularly beneficial for animals that require a dense source of nutrients to support activities such as growth, pregnancy, or lactation. These feeds are usually made from grains or protein meals, which provide a concentrated source of carbohydrates and proteins.

In contrast, roughages, such as hay or silage, are typically high in fiber and are designed to aid in digestion and maintain gut health, but they do not provide the same level of energy. By-products are materials that remain after the processing of raw products, and they can vary widely in energy and fiber content. Supplements are added to the diet to address specific nutritional deficiencies but are not categorized primarily by their energy content relative to fiber as concentrates are. Understanding the role of each type of feed helps in formulating diets that meet the specific needs of different animals.