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Gaseous emissions during the fattening of pigs kept either on fully slatted floors or on straw flow

Published online by Cambridge University Press:  01 November 2007

F.-X. Philippe ,
M. Laitat ,
B. Canart ,
M. Vandenheede  and
B. Nicks
F.-X. Philippe*
Affiliation:
Department of Animal Productions, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20-Bât. B43, 4000 Liège, Belgium
M. Laitat
Affiliation:
Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20-Bât. B43, 4000 Liège, Belgium
B. Canart
Affiliation:
Department of Animal Productions, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20-Bât. B43, 4000 Liège, Belgium
M. Vandenheede
Affiliation:
Department of Animal Productions, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20-Bât. B43, 4000 Liège, Belgium
B. Nicks
Affiliation:
Department of Animal Productions, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20-Bât. B43, 4000 Liège, Belgium
*
E-mail: fxphilippe@ulg.ac.be
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Abstract

The aim of this study was to compare the environmental impact of the straw-flow system for fattening pigs with the slatted-floor system by measuring pollutant gas emissions such as ammonia (NH3), nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2), manure nitrogen (N) content and emissions of water vapour (H2O). Three successive batches of 32 pigs were fattened. For each batch, pigs were allotted to two groups raised in separated rooms fitted either with a concrete totally slatted-floor system (0.75 m2 per pig) or with a straw-flow system (0.79 m2 per pig). With this last system, pigs were kept on a sloped floor, straw being provided daily at the top of the pen. Throughout the fattening period, about 34.4 kg of straw were supplied per pig. The straw, mixed with dung, travelled down the slope by pig motion and went out of the pen to a scraped passage. The solid fraction was scraped every day, stored in a heap in the room and removed every month, 1 week before each period of gaseous emission measurement. The liquid fraction was automatically pumped from the scraped passage into a hermetic tank, which was emptied at the end of each fattening period. Rooms were ventilated mechanically in order to maintain a constant ambient temperature. Once a month, the emissions of NH3, N2O, CH4, CO2 and H2O were measured hourly for 6 consecutive days via infrared photoacoustic detection. Mean daily emissions per pig fattened on the slatted floor or on the sloped floor were, respectively, 4.98 and 13.31 g NH3, 0.67 and 0.68 g N2O, 15.2 and 8.88 g CH4, 548 g and 406 g CO2 equivalents, 1.61 and 1.77 kg CO2 and 2.33 and 2.95 kg H2O. Except for N2O emissions, all the differences were statistically significant (P < 0.001). From the slatted-floor system, the amount of slurry removed per fattening period was on average 256 kg per pig. From the straw-flow system, solid manure amounted on average to 209 kg per pig and liquid manure to 53 kg per pig. The total N-content of the manure was 2.23 kg N per pig with the straw-flow system (solid and liquid manure) v. 3.26 kg N per pig for slurry from the slatted-floor system. This reduction of 30% observed with the sloped floor was mainly explained by the higher level of NH3-N emissions.

Keywords

ammoniagreenhouse gasespigsslatted floorsstraw flow
Type
Full Paper
Information
animal , Volume 1 , Issue 10 , November 2007 , pp. 1515 - 1523
Copyright
Copyright © The Animal Consortium 2007

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