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Corn Silage Fermentation. II. Effects of Crude Protein Sources and Sodium Bisulfite on Nitrogenous Constituents^1,2,

University of Minnesota, St. Paul⁴

Abstract

The effects of added nitrogen sources (urea, biuret or soybean meal) and a chemical antibacterial agent (sodium metabisulfite) on nitrogenous fractions of corn silage or corn stalklage during fermentation were studied using laboratory silos. Additions of crude protein increased final silage crude protein contents. Losses of crude protein during fermentation were small, at the levels of additions used. The nitrogen fraction which was increased to the greatest degree by urea additions was ammonia. Only small amounts of urea remained following fermentation. Much of the ammonia was lost upon drying of silage samples. This suggests that accurate analyses for crude protein are obtained only with non-dried silage. Final silage nitrate content was greater when sodium bisulfite was added but appeared to be lowered by the extended fermentation which resulted when urea was added.

¹ Paper No. 6938, Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² This paper represents a portion of the senior author's thesis submitted to the Graduate School, University of Minnesota, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

³ Present address: Department of Animal Science, University of Illinois. Urbana.

⁴ Department of Animal Science.