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Effect of Dietary Crude Protein on Ammonia Emissions From Open-Lot Beef Cattle Feedyards

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  034143,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13889) @2003
Authors:   Syamalakumar Pandrangi, David B. Parker, L. Wayne Greene, Lal K. Almas, Marty B. Rhoades, N. Andy Cole
Keywords:   Ammonia, emissions, beef cattle, feedlot, feedyard, air quality, crude protein, urea, cotton seed meal

A laboratory study was performed to compare ammonia emissions from simulated feedlot surfaces. Beef cattle manure was collected from open lot pens at the USDA-ARS feedlot in Bushland, TX. Treatments within the pens consisted of two dietary crude protein concentrations (11.5 and 13%) and two protein sources (urea and cottonseed meal). Manure collected from the pens was placed into Tupperware chambers in the laboratory. Chambers were sealed and ammonia was trapped in an acid solution for 15 days using a vacuum system. Results suggest that as the protein concentration in the diet increases, potential daily ammonia emissions increase. The source of crude protein had little effect on ammonia emissions.

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