Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 363668
Title Ammonia emission and nutrient load in outdoor runs of laying hens
Author(s) Aarnink, A.J.A.; Hol, J.M.G.; Beurskens, A.G.C.
Source NJAS Wageningen Journal of Life Sciences 54 (2006)2. - ISSN 1573-5214 - p. 223 - 234.
Department(s) LR - Backoffice
Livestock Research
Institute of Agricultural and Environmental Engineering
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) pluimveehouderij - scharrelhouderij - emissie - ammoniak - eu regelingen - pluimveemest - mineralenboekhouding - poultry farming - free range husbandry - emission - ammonia - eu regulations - poultry manure - nutrient accounting system - volatilization
Categories Poultry / Animal Husbandry and Environment
Abstract Ammonia emission and nutrient load in outdoor runs of laying hens were measured at a commercial farm with an outdoor run for 3000 hens, and at an experimental farm with two outdoor runs, each for approximately 250 hens. Ammonia emission was recorded at 5, 10,15 and 20 m from the hen house, using the ventilated chamber technique. Nutrient load was determined by analysing the fresh droppings. The results show ammonia emission to decrease with increasing distance from the hen house. The average emission per hen was 2.0 mg h(-1) for the run of the commercial farm, and 0.95 and 0.86 mg h(-1) for the two runs of the experimental farm. The nutrient load within 20 m from the hen house exceeded the threshold value for nutrient supply from manure (170 kg N and 44 kg P per ha) by a factor 15 on both the commercial farm and the experimental farm. The results show that the ammonia emission from the outdoor run of laying hens was relatively small compared with the emission from the hen house and that the nutrient load in the outdoor run near the house by far exceeded maximum acceptable levels.
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