Meeting the nutrient requirements of beef cattle is crucial for maintaining good performance in growing, finishing, and breeding animals. Producers must consider both performance and the economic impact of feed inputs. Knowledge of nutrient requirements helps in developing economical feeding programs. Tables 1 and 2 provide nutrient requirements for various classes and weights of cattle. These tables can be used to estimate requirements for weights or rates of gain not listed. Using these tables and Extension publication B-1553, "Nutrient Composition of Feeds," or forage analysis helps formulate rations that meet the requirements. Nutrient concentrations depend on dry matter intake, which varies with diet energy and environment. The values in the tables assume ideal conditions. If the diet's energy is higher, limiting feed may be needed. Energy content can be expressed in various ways, with TDN being the most common. Other methods include GE, DE, ME, NEm, and NEg. Conversions between these values are possible using specific formulas. For growing cattle, nutrient intake can be estimated based on forage consumption. Supplements can improve nutrient ratios. Finishing rations are complete diets, allowing for easier management of rate, cost, and efficiency. Environmental changes are not accounted for in the tables but must be considered in ration formulation. Breeding cattle have complex requirements due to various factors like forage quality, production stage, and body condition. Tables provide average values assuming thermoneutral conditions. These should be used as a starting point. Separating cattle by production stage, age, and body condition improves efficiency. Breeding seasons should align with high-quality forage growth. Supplementation ensures adequate minerals and vitamins. Forage tests and tables help develop economical programs. Changes in body condition indicate energy deficiencies. Energy sources in B-1553 can correct these deficiencies. Forage programs generally meet mature cow needs, but young heifers may need supplements. Producers should aim for group averages rather than individual requirements. Sorting cattle by age, weight, sex, production stage, and body condition improves efficiency. Understanding nutrient requirements is essential for minimizing costs and optimizing returns. Tables 1 and 2 provide nutrient requirements for growing and finishing cattle, while Table 3 lists mineral requirements. Extension offices offer up-to-date information on agriculture, home economics, 4-H, and youth development.Meeting the nutrient requirements of beef cattle is crucial for maintaining good performance in growing, finishing, and breeding animals. Producers must consider both performance and the economic impact of feed inputs. Knowledge of nutrient requirements helps in developing economical feeding programs. Tables 1 and 2 provide nutrient requirements for various classes and weights of cattle. These tables can be used to estimate requirements for weights or rates of gain not listed. Using these tables and Extension publication B-1553, "Nutrient Composition of Feeds," or forage analysis helps formulate rations that meet the requirements. Nutrient concentrations depend on dry matter intake, which varies with diet energy and environment. The values in the tables assume ideal conditions. If the diet's energy is higher, limiting feed may be needed. Energy content can be expressed in various ways, with TDN being the most common. Other methods include GE, DE, ME, NEm, and NEg. Conversions between these values are possible using specific formulas. For growing cattle, nutrient intake can be estimated based on forage consumption. Supplements can improve nutrient ratios. Finishing rations are complete diets, allowing for easier management of rate, cost, and efficiency. Environmental changes are not accounted for in the tables but must be considered in ration formulation. Breeding cattle have complex requirements due to various factors like forage quality, production stage, and body condition. Tables provide average values assuming thermoneutral conditions. These should be used as a starting point. Separating cattle by production stage, age, and body condition improves efficiency. Breeding seasons should align with high-quality forage growth. Supplementation ensures adequate minerals and vitamins. Forage tests and tables help develop economical programs. Changes in body condition indicate energy deficiencies. Energy sources in B-1553 can correct these deficiencies. Forage programs generally meet mature cow needs, but young heifers may need supplements. Producers should aim for group averages rather than individual requirements. Sorting cattle by age, weight, sex, production stage, and body condition improves efficiency. Understanding nutrient requirements is essential for minimizing costs and optimizing returns. Tables 1 and 2 provide nutrient requirements for growing and finishing cattle, while Table 3 lists mineral requirements. Extension offices offer up-to-date information on agriculture, home economics, 4-H, and youth development.