Influence of permanent use of feeding stalls as living area on ammonia and greenhouse gas emissions for group-housed gestating sows kept on straw deep-litter F.X. Philippe a , M. Laitat b , J. Wavreille c , B. Nicks a , J.F. Cabaraux a,n a Department of Animal Production, Bât. B43, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20, 4000 Liège, Belgium b Department of Production Animals Clinic, Bât. B42, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium c Production and Sectors Department, Walloon Agricultural Research Centre, 5030 Gembloux, Belgium article info Article history: Received 10 August 2012 Received in revised form 6 May 2013 Accepted 7 May 2013 Keywords: Ammonia Feeding stalls Gestating sow Greenhouse gases Partly bedded floor Water vapour abstract In pig production, the interest for litter systems in relation with animal welfare and the ban by 2013 in the EU of individual accommodations for gestating sows could promote the group-housing of gestating sows on deep-litter. However, compared to slatted-floor systems, few data are available on the gaseous emissions associated with the different modalities of rearing sows on deep-litter. In this study, two modalities were compared: group housing on a 3 m 2 /sow deep-litter or on a 1.8 m 2 /sow deep-litter plus 1.2 m 2 /sow concrete floor. In both cases, sows were fed in individual feeding stalls (1.2 m 2 /stall) but the access was limited at feeding time in the first case and permanent in the second one. Three successive batches of 10 gestating sows were used. Each batch was divided into 2 homogeneous groups randomly allocated to one of two treatments: fully (3 m 2 /sow) or partly (1.8 m 2 /sow) straw-based deep-bedded floor. The groups were kept separately in two identical rooms with same volume and same surface, equipped with five individual feeding stalls in contact with a pen of either 9 or 15 m 2 deep-litter. The feeding stalls were equipped with front feeding troughs and rear gates allowing or not permanent access to the stalls outside of feeding times. Between each batch, the pens were cleaned. In both rooms, ventilation was auto- matically adapted to maintain a constant ambient temperature. The gas emissions (nitrous oxide, methane, carbon dioxide, ammonia and water vapour) were measured 3 times (weeks 2, 5 and 8 of stay) during 6 consecutive days by infrared photoacoustic detection. Sow performance was not significantly affected by floor type. With sows kept on partly bedded floor, gaseous emissions were significantly greater for methane (12.76 vs. 9.90 g/d.sow; P o0.001), carbon dioxide (3.12 vs. 2.90 kg/d.sow; P o0.01) and water vapour (4.70 vs. 4.03 kg/d.sow; P o0.001), and significantly lower for nitrous oxide (3.14 vs. 6.12 g/d.sow; P o0.001) and CO 2 equivalents (1.24 vs. 2.10 kg/d.sow; P o0.001) compared to sows housed on fully bedded floor. There was no significant difference for ammonia emissions (8.36 vs. 7.45 g/d.sow; P 40.05). From the present trial in experimental rooms, it can be concluded that keeping group- housed gestating sows on partly straw bedded floor with permanent access to the concrete feeding stalls compared to fully straw bedded floor did not significantly influence animal performance and NH 3 -emissions, and decreased CO 2eq -emissions (-40%). This decrease was observed owing to an important decrease of N 2 O-emissions (-49%). & 2013 Elsevier B.V. All rights reserved. Contents lists available at SciVerse ScienceDirect journal homepage: www.elsevier.com/locate/livsci Livestock Science 1871-1413/$ - see front matter & 2013 Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.livsci.2013.05.005 n Corresponding author. Tel.: +32 4 366 59 03; fax: +32 4 366 41 22. E-mail address: jfcabaraux@ulg.ac.be (J.F. Cabaraux). Livestock Science 155 (2013) 397–406