Effects of a reduction of diet crude protein content on gaseous emissions from deep-litter pens for fattening pigs François-Xavier Philippe, Martine Laitat, Bernard Canart, Frédéric Farnir, Laurent Massart, Marc Vandenheede and Baudouin NicksAnim. Res., 55 5 (2006) 397-407DOI: https://doi.org/10.1051/animres:2006029