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Ammonia Emission Factors Modelling for a Naturally Ventilated Dairy Housing System with Cubicles, Solid Floors and an Outdoor Exercise Area

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

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-0595.(doi:10.13031/2013.41542)
Authors:   Sabine Schrade, Lorenz Gygax, Margret Keck
Keywords:   Emission factor, ammonia, modelling, dairy housing, natural ventilation

Ammonia (NH3) emission factors for a naturally ventilated cubicle loose housing system with solid floors and an exercise yard alongside were calculated based on our emission measurements on six commercial dairy farms using the tracer ratio method. A model-based calculation with bootstrapped variance components was used. Milk urea levels from the Cattle Breeders Association in Switzerland and air temperature data over five years at two altitudes (mountain region, plain region) from Switzerland together with two different wind speeds in the housing (0.3 and 0.5 m s-1) formed the underlying data for this model-based calculation. The calculated NH3 emission factors ranged between 22 and 25 g LUd-1. With this approach it was possible to determine regionally differentiated NH3 emission factors based on widely available underlying data of high temporal and spatial resolution, thereby showing regional differences in climatic conditions and feeding levels.

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