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Relationship Between TDN and Energy Values of Feeds

Bureau of Dairy Industry, Agriculture Research Administration, U. S. Department of Agriculture, Washington, D. C.

H. M. Irvin and J. C. Shaw

University of Maryland

ABSTRACT

There is considerable difference of opinion about methods of evaluating feeds and methods of expressing their value. In the United States, Total Digestible Nutrient content (TDN) has become a common method of expressing the value of feeds. In Europe, the Net Energy (NE) system, or some modification thereof, has been in vogue. Various opinions have been expressed concerning the relative merits and value of the two systems. It should be pointed out also that there has been some discussion in the United States of the use of Metabolizable Energy as a method of expressing the value of feeds.

It is the purpose of this paper to report the results of a study of the relationship between the TDN content and energy value of feeds. For this study, energy-value data derived from experiments involving several animals were obtained from several sources and plotted against the TDN value for the same feed.

Results