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2004

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Kansas Agricultural Experiment Station Research Reports

2004; Kansas Agricultural Experiment Station contribution; no. 04-242-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 923; Beef; Nitrogen; Liquid feedstuff; rumen

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Evaluation Of Nitrogen Availability In Liquid Feedstuffs, E.A. Elwakeel, Evan C. Titgemeyer, James S. Drouillard Jan 2004

Evaluation Of Nitrogen Availability In Liquid Feedstuffs, E.A. Elwakeel, Evan C. Titgemeyer, James S. Drouillard

Kansas Agricultural Experiment Station Research Reports

We developed an in vitro assay to assess ruminal availability of protein in liquid feeds containing soluble protein/nitrogen. Microbial mass accumulating as a result of assimilation of dietary nitrogen by ruminal microbes during an in vitro fermentation is measured. In the assay, microbial growth is most limited by the availability of protein/nitrogen, so microbial mass is proportional to the amount of available nitrogen in the sample. In liquid feeds that we generated in the laboratory, ruminal nitrogen availability decreased in response to mild heating, and the decline was greater for feedstuffs containing true protein rather than urea. Addition ...