Relationship Between TDN and Energy Values of Feeds

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Abstract
When the estimated net energy values of Morrison, net energy values of Forbes, and the productive energy values of Fraps are plotted graphically against the total digestible nutrient values, a definite linear relationship is apparent. The Net Energy value of feeds decreases at a faster rate than the Total Digestible Nutrient value decreases. Therefore, the energy value of a unit of TDN in concentrates is greater than that of the same unit in roughages. The regression equation of Morriosn''s data, Forbes'' data, and the productive energy data of Fraps for sheep are quite similar.