[en] Gaseous emissions from agriculture contribute to a number of environmental effects. Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are greenhouse gases taking part in the global problem of climate change. Ammonia (NH3) emissions are responsible of soil and water acidification and eutrophication and contribute also to indirect emissions of N2O. The objective of this study was to investigate the effects of a high-fibre diet offered ad libitum to gestating sows on gaseous emissions (NH3, N2O, CH4, CO2 and water vapour (H2O)). Four successive batches of 10 gestating sows were used for this trial. Each batch was divided into 2 homogeneous groups randomly allocated to a treatment: restricted conventional cereals based diet or high-fibre diet based on sugar beet pulp (42%). The groups were separately kept in two identical rooms equipped with a straw-bedded pen of 12.6 m². For restricted sows, meals were provided once a day in individual feeding stalls available only during the feeding time. In both rooms, ventilation was automatically adapted to maintain a constant ambient temperature. The
gas emissions were measured by infrared photoacoustic detection during 6 consecutive days at the 6th, 9th and 12th weeks of gestation.
Sows performance (body weight gain, backfat thickness, number and weight of piglets) was not significantly different according to the diet. With sows offered high-fibre diet and compared to sows offered restricted diet, gaseous emissions were significantly greater for NH3 (9.64 g NH3-N d-1 sow-1 vs. 5.37 g NH3-N d-1 sow-1; P < 0.001), CH4 (17.20 g d-1 sow-1 vs. 15.21 g d-1 sow-1; P < 0.01), CO2 (3.00 kg d-1 sow-1 vs. 2.41 kg d-1 sow-1; P < 0.001) and H2O (4.71 kg d-1 sow-1 vs. 3.68 kg d-1 sow-1; P < 0.001) and significantly lower for N2O (0.97 g N2O-N d-1 sow-1 vs. 2.48 g N2O-N d-1 sow-1; P < 0.001) and CO2 equivalents (0.88 kg d-1 sow-1 vs. 1.55 kg d-1 sow-1; P < 0.001). In conclusion, the effects of high-fibre diet offered to gestating sows on deep litter on environment seem ambiguous with an increase of NH3 emissions but a decrease of N2O and CO2 equivalent emissions.
Disciplines :
Environmental sciences & ecology Animal production & animal husbandry
Author, co-author :
Philippe, François-Xavier ; Université de Liège - ULiège > Département de productions animales > Ecologie et éthologie vétérinaires
Canart, Bernard
Laitat, Martine ; Université de Liège - ULiège > Département clinique des animaux de production (DCP) > Département clinique des animaux de production (DCP)
Wavreille, José
Vandenheede, Marc ; Université de Liège - ULiège > Département de productions animales > Ethologie vétérinaire et bien-être des animaux
Bartiaux-Thill, Nicole
Nicks, Baudouin ; Université de Liège - ULiège > Département de productions animales > Ecologie et éthologie vétérinaires
Cabaraux, Jean-François ; Université de Liège - ULiège > Département de productions animales > Ecologie et éthologie vétérinaires
Language :
English
Title :
Gaseous emissions from group-housed gestating sows kept on deep litter and offered an ad libitum high-fibre diet
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