Date of this Version
Data from feeding 54 diets in seven previous beef cattle growing studies were used to evaluate the 1996 NRC model for the accuracy of intake and gain predictions. Calf weights and diets were inputs into the model, and actual intakes were used to calculate predicted gain and actual gains were used to calculate predicted intakes. The model over-predicted calf intakes on low quality diets and under-predicted intakes on high quality diets. The model over-predicted gains on high quality diets and under-predicted gains on low quality diets. The NRC model did not accurately predict performance of cattle on low quality roughage diets.