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AMMONIA REDUCTION MEASURES IN FLOOR HOUSING SYSTEMS FOR LAYING HENS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Proceedings of the Seventh International Symposium, 18-20 May 2005 (Beijing, China) Publication Date 18 May 2005 701P0205.(doi:10.13031/2013.18367)
Authors: Gosta Gustafsson & Eva von Wachenfelt
Keywords: Ammonia, ammonia reduction, floor housing systems, laying hens, manure storage, poultry
Due to animal welfare considerations, there is an increasing interest in development of floor
housing systems for laying hens as an alternative to cage systems. However, the hygienic
threshold limit value of 25 ppm ammonia established for animal welfare (Swedish Board of
Agriculture, 2003) and for occupational safety and health (Swedish National Board of
Occupational Safety and Health, 2000) is often exceeded in floor housing systems for laying
hens with long-time storage of manure in bins below draining floors (Mannebeck & Oldenburg,
1990; Gustafsson & Mrtensson, 1990; Hillig, 1992; von Wachenfelt, 1993; Hauser & Flsch,
1993; Koerkamp et al., 1995; Koerkamp, 1996). In some cases, concentrations as high as 80 ppm
have been measured (von Wachenfelt et al., 2002).