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 Donker, J. D. Articles by Naik, D. G. Search for Related Content PubMed Articles by Donker, J. D. Articles by Naik, D. G.

Predicting Total Digestive Nutrients and Estimated Net Energy of Dairy Cow Rations from Chemical Components¹

Department of Animal Science, University of Minnesota, St. Paul 55108

ABSTRACT

Fourteen rations varying in composition were fed in measured quantities to satisfy appetites of Holstein cows from calving through 6 or more mo of lactation. Milk yield and energy intake increased as available energy content of rations increased, but intake of dry matter was not related to milk production. The requirements for total digestible nutrients and estimated net energy of the average cow fed each ration were calculated from published requirement factors. Energy requirements were divided by amounts of dry matter consumed to calculate the total digestible nutrients and estimated net energy of dry matter consumed for each of the 14 rations. These energy values were regressed on crude fiber contents of rations either alone or with the crude protein contents to derive prediction formulas to calculate the total digestible energy or estimated net energy of rations. The following formulas had squared multiple correlation coefficients .89, .95, .85, and .93, respectively:

¹ Scientific Journal Series, Paper No. 9974, Minnesota Agricultural Experiment Station.

² Department of Animal Science, GB Pont University, Pantnageer, India