Evaluation of Net Energy Systems

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Abstract
ENERGY metabolism is influenced by environmental, digestive and metabolic factors of which the chemical composition of the diet, associative effects of feeds and nutrients, level of feed intake, heat increment and maintenance are probably the most important. It appears that maintenance requirement increases with an increase in production. Since the animal has only one metabolism which varies with level of energy intake and production, NE should not be separated into two theoretical fractions, NEm and NEp. The California, German and British systems of determining NE were evaluated on the basis of the number of metabolic factors which they consider as variables in predicting NE. The German and British NE systems take into account more variables than the California system, which regards all of the factors to be constant under different environmental conditions. Nevertheless, these methods have made important contributions to the promotion of the net energy system in evaluating feeds and rations and in describing the energy requirement of animals. However, further research is needed to determine the magnitude of the factors which may influence NE and to determine the conditions under which these influences are exerted. Copyright © 1973. American Society of Animal Science . Copyright 1973 by American Society of Animal Science.

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