How do animal scientists study the nutrients farm animals need?

Animal scientists study the nutrient requirements of farm animals through a combination of chemical analysis, controlled feeding experiments, and physiological research. These investigations are essential for optimizing animal health, growth, and production efficiency.1

Research Methods

• Digestion and Balance Experiments: Scientists measure the degree to which feed components are absorbed and retained by the animal body. By analyzing intake versus excretion, researchers determine the nutritional value of various feedstuffs.2
• Animal Assays: To determine specific requirements for vitamins and other nutrients, researchers use standardized growth assays. These may be prophylactic (measuring weight gain in young animals given specific nutrient amounts) or curative (measuring recovery in animals previously deprived of a nutrient).3
• Chemical Analysis: Standard laboratory techniques are used to determine the dry matter, protein, fat, fiber, mineral, and vitamin content of feeds.4
• Energy Measurement: Scientists calculate energy needs using values such as digestible energy (DE), metabolizable energy (ME), and net energy (NE). These measurements account for energy losses during digestion and metabolism, which vary significantly between species like ruminants and monogastrics.2

Through these studies, scientists have identified the essential amino acids, minerals, and vitamins required for different species, leading to improved dietary balance and feeding technologies.1