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The Caloric Value of TDN^{1, 2,}

The Pennsylvania State University

Abstract

A study of data obtained from 312 digestion experiments in which both digestible energy and total digestible nutrients were experimentally determined revealed that one pound of total digestible nutrients is equivalent of 2000 Calories of digestible energy. This value was found to apply to sheep and cattle on roughage alone and to cattle on mixed rations.

¹ Authorized for publication on May 2, 1957, as paper no. 2146 in the journal Series of the Pennsylvania Agricultural Experiment Station, University Park.

² This study was part of a Northeast Regional Project, NE-24 "The Nutritive Evaluation of Forages", a cooperative study involving agricultural experiment stations in the Northeastern Region, the Dairy Husbandry Research Branch, USDA, and the U. S. Regional Pasture Research Laboratory and supported in part by regional funds.