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 Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Dutton, R. E. Articles by Otterby, D. E. Search for Related Content PubMed PubMed Citation Articles by Dutton, R. E. Articles by Otterby, D. E.

Nitrogen Additions to High Moisture Corn and Its Utilization by Ruminants¹

Department of Animal Science, University of Minnesota, St. Paul 55101

ABSTRACT

Urea, diammonium phosphate, and soybean meal were ensiled with high-moisture shelled corn in amounts which provided 0, 1.4, 2.8, 4.2, 5.6, or 8.4 percentage units of added crude protein equivalent. After 45 and 60 days of fermentation, high-moisture corn supplemented with urea and diammonium phosphate had higher pH values, higher ammonia contents, and greater nitrogen losses than the control, or corn supplemented with the soybean meal. Nitrogen losses ranged from 4 to 23% for the urea-treated corn, 5 to 15% for the corn with added diammonium phosphate, and .5 to 11% for the corn ensiled with the soybean meal. Only 2 to 18% of the added urea was recovered as urea nitrogen. Acetic acid was more and propionic acid less in corn ensiled with urea than in control, diammonium phosphate, or soybean meal. Generally, lactic acid and ethanol were lower in high-moisture corn with added urea. Addition of diammonium phosphate resulted in intermediate lactic acid. Dry matter and nitrogen digestibilities of the corn supplemented with urea, diammonium phosphate, or soybean meal did not differ (P > .05) when fed to lambs. Nitrogen retention was greater (P < .05) for lambs which received the soybean meal than for those fed the corn with added urea or the phosphate. The relationship between nitrogen sources for dry matter digestibility, nitrogen digestibility, and nitrogen retention was not influenced by adding nitrogen sources to the high-moisture corn at feeding or ensiling. No differences were detected in molar proportions of rumen volatile fatty acids with the exception that isovaleric acid was higher in rumen fluid from lambs fed the corn with added soybean meal. Rumen pH, ammonia, ethanol, lactic acid, and blood urea were not affected by diet.

¹ Paper 7546, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul.

² Data in this paper are from a thesis submitted by the senior author in partial fulfillment of the requirements for the Degree of Master of Science.