HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Nehring, K. Articles by Haenlein, G. F. W. Search for Related Content PubMed Articles by Nehring, K. Articles by Haenlein, G. F. W.

Feed Evaluation and Ration Calculation Based on Net Energy_FAT

University of Rostock, Germany and University of Delaware, Newark 19711

Abstract

The comprehensive studies of energy metabolism by the research team of Nehring, Schiemann, Hoffmann, Jentsch and Chudy at the Oskar Kellner Institute of Animal Nutrition at Rostock, Germany, during the past 14 years were summarized. The new system of feed evaluation and nutrient requirements as developed on the basis of Kellner's net energy concept was explained. Contents of the net energy_fat (NEF) in purified nutrients and feeds from many different groups had been determined in several hundred respiration trials by the difference method. It was found that NEF can be calculated from contents of digestible nutrients with the same accuracy as by direct determination in respiration experiments. The obtained regression equations can be used without restrictions only in monogastric animals. For ruminants, because of interactions between the basal ration and supplements in the rumen, the difference method was replaced by an evaluation of whole rations, including 92 rations with cattle and 81 with sheep. Final regression equations and standard deviations gave satisfactory accuracy of NEF values for all feeds and all farm animals. Differences between animal species indicated that values cannot be transferred from one species to another directly. Equations for the calculation of gross energy, digestible energy and metabolizable energy from nutrient contents were developed. Examples of calculations of rations from the tables of feed composition and nutrient requirements were given. Tables list values for three groups of animals separately: ruminants and horses, monogastric mammals, poultry. Parameters of calculations are kcal NEF, g digestible crude protein, kcal EF (energy feed units) per kilogram dry matter and EPQ (energy-protein quotient).

¹ Paper presented at the Nutrition Seminar, University of Delaware, Newark, May 22, 1969 and at other American universities while the author was a guest professor at Cornell University, Ithaca, New York.

² Professor, Ph.D., Ph.D. hon., D.Sci. hop., Section of Animal Production, University of Rostock. Director em., Oskar Kellner Institute of Animal Nutrition, National Academy of Agricultural Sciences, Berlin; present address: Rostock, Germany, Schliemannstrasse 15A.

³ Department of Animal Science and Agricultural Biochemistry; reprints available from this address.

⁴ Published with the approval of the Director of the Delaware Agricultural Experiment Station as Miscellaneous Paper 659, Contribution 11 of the Department of Animal Science and Agricultural Biochemistry, University of Delaware, Newark. Authorized and approved by the author, K. Nehring.