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Field Evaluation of Dried Distiller Grain Solubles and Best Management Practices to Reduce Ammonia Emissions from a High-Rise Layer Barn

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009997.(doi:10.13031/2013.30040)
Authors:   Teng Teeh Lim, Jiqin Ni, Albert Heber, Sam Hanni
Keywords:   Mitigation, manure, feed, air quality, feed.

Ammonia (NH3) emission rates were measured at two large high-rise layer barns in Ohio, from August 1, 2007 to March 17, 2008. The tests were conducted to evaluate effects of dried distiller grain solubles (DDGS) in the diet, combined with several best management practices (BMPs). The BMPs included the operation of 36 manure drying fans in the manure pit, reduced crude protein in the feed, improved waterline leak management practices, and lower bird density. The DDGS feed and the BMPs were implemented in Barn 2, and tested for their combined effectiveness on mitigating NH3 emissions. The average daily mean (ADM) NH3 emission rates from the untreated Barn 1 was 729 g d AU (2.21 g d hen), where AU is the animal unit (500 kg live mass). When the fiber-enhanced diets and BMPs were implemented, the mean paired difference of NH3 emission between the two barns was 72% (treated barn was lower, n=90 out of 105 days). When only the BMPs were implemented, NH3 emission reduction averaged 64%. However, the reduction was not entirely attributed to the BMPs because of manure remaining from the previous test. The effects of BMPs were evaluated again after manure removal and pit re-bedding in the last test period. The BMPs had reduced the emission rate by 55%. The pit drying fans, leakage management program, and other BMPs successfully lowered the manure moisture content in the treated barn and contributed to lower NH3 emissions.

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