Basic Nutrient Requirements of Beef Cattle It can be measured in the laboratory or estimated from nutrient content (using fiber alone or multiple nutrients). In ruminants, there are 5 classes of vitamins that are important when considering nutrient requirements. Vitamins D, E, K, and some of the B vitamins are also known to be essential. Monitor water consumption, especially during hot weather or lactation when requirements are higher. Additionally, ensure that water sources are easily accessible to all cattle, including …