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Manure ammonia and green house gas emissions from beef cattle fed condensed tannins

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

Citation:  2016 ASABE Annual International Meeting  162459748.(doi:10.13031/aim.20162459748)
Authors:   Terra N. Campbell, Marty B. Rhoades, Eric A. Bailey, David B. Parker, Adam L. Shreck
Keywords:   air quality, emissions, manure, volatilization


A study was conducted to determine the effects of three levels of condensed tannins fed to 27 beef feed yard steers on ammonia and GHG emissions from manure. Condensed tannins were fed at rates of 0, 0.5 and 1.0% on a dry matter basis. Manure and urine were collected from two periods over 6 days. Fecal and urinary output was measured on a per animal basis. Manure and urine were placed in inert plastic containers and stored separately at -4o C until analysis. Manure was placed in 16.7 x 16.7 x 17 cm plastic chambers and urine was topically added. Samples were collected every 24 hours for 1 week, then every 48 hours for 1 week. Headspace samples were injected into a GHG GC for analysis. NH3 concentrations were measured using a Manning Systems, Inc., ECP2 gas detector. H2S concentrations were measured using a Jerome 631-x Hydrogen Sulfide Analyzer. Increasing amounts of tannins fed to the animals showed a 0, 51, and 57% reduction of NHconcentrations in the headspace, respectively. CO2 emissions showed an increase with amount of condensed tannin fed. There was no treatment effect on N20 emissions. Results indicate that condensed tannins fed to beef cattle can effectively reduce gaseous NH3 emissions from confined beef animal facilities.

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