Joint Symposium: Ruminant Nutrition 1/ Pastures and Forages 1/Production and Management

摘要

(1:Nutritional Factors Impacting the Nutrient Balance of Beef and Dairy Operations: Animal Grouping Strategies, Sources of Variation, and Economic Factors) Affecting Nutrient Balance on Dairy Farms Increasing environmental concerns are forcing animal industries to reevaluate current feeding prac- tices and their relationships to nutrient excretion. Previous modeling efforts have used simple budgets of Nutrient flows through animals, assuming a constant Productivity level. This assumption is not valid if Animals are not in a steady state. A response model of Dairy cow production to levels of net energy for lacta- Tion (NE_L) and crude protein (CP) was derived from An abrupt threshold and plateau model of individuals.