References of "Laitat, Martine"
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See detailA clinical case of congenital tremors in piglets without evidence of PCV-1 and PCV-2
wavreille; Simon, Fanny (Co-first author); Servais, Vincent et al

Poster (2013, May 22)

Congenital tremor (CT) is a disease of newborn pigs characterized by spontaneous clonic contractions of one or more groups of voluntary muscles. Besides suspected or confirmed etiologies of CT such as ... [more ▼]

Congenital tremor (CT) is a disease of newborn pigs characterized by spontaneous clonic contractions of one or more groups of voluntary muscles. Besides suspected or confirmed etiologies of CT such as classical swine fever virus, pseudorabies virus, Japanese encephalomyelitis virus, hereditary disorders in Landrace or Saddleback pigs, organophosphorus poisoning etc., porcine circovirus (PCV) has been described as a potential cause of CT. The type AII seems to be the most common form of CT. Although a potential association between PCV1 or PCV2 and CT-AII has been observed, about 50% CT cases described up till now are caused by unknown reasons. In a PCV-seropositive 108-sow, farrow-to-finish Belgian pig farm breeding hyperprolific Landrace, 42 litters with shaking piglet(s) were reported since June 2006. On March 2012, piglets born from four sows of a 27 sow batch demonstrated CT. After exclusion of main etiologies of CT from these CT-affected piglets, it was hypothesized that PCV1 or PCV2 could be the reason. Necropsies (n=8) and histopathology (n=3) were performed and no evidence of macroscopic or microscopic lesions were seen in cerebrum, cerebellum and spinal cord. Pre-suckled and post-suckled (after 3 days of colostrum uptake) serum samples were also collected from 9 piglets to determine PCV1- and PCV2-specific Ab titres by an immuno-peroxidase monolayer assay (IPMA). No PCV-specific Ab titres were observed in pre-suckled serum samples (≤40), whereas IPMA Ab titres of ≥640 were observed in post-suckled serum samples. Both PCV1 and PCV2 could not be isolated (<101.7 TCID50/g tissue) from 4 tested piglets (in heart, brain and lungs). The present results do not support the hypothesis that PCV1 or PCV2 are linked to CT in newborn piglets. [less ▲]

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See detailPrevalence of PRRS virus in Wallonia (Belgium)
Czaplicki, Guy; Thilmant, Pierre ULg; Hooyberghs, Josef et al

Poster (2013, May 22)

Porcine reproductive and respiratory syndrome (PRRS) causes major economical losses in pig farms. In different parts of the world, there is a growing consensus that PRRS virus (PRRSv) eradication should ... [more ▼]

Porcine reproductive and respiratory syndrome (PRRS) causes major economical losses in pig farms. In different parts of the world, there is a growing consensus that PRRS virus (PRRSv) eradication should be performed on a regional basis, particularly in low density areas of pig production. The objective of the present study was to evaluate the apparent prevalence of PRRSv in Wallonia, a low density area of pig production (0.05 pig farms/km²). At this stage of the study, a phone survey has been addressed to 61/276 Walloon breeding pig owners. Fifty-eight answered to the questionnaire: 51 are responsible of a farrow-to-finish farm, 6 of a farrowing farm and 1 of a PRRS-free boar station. In 35% of the tested farms, sows are vaccinated with a modified live virus (MLV) PRRS vaccine (n=11) or with a killed PRRS vaccine (n=9). In two farms, both sows and piglets are vaccinated with a MLV PRRS vaccine. Replacement gilts are purchased in 33% farms. Among the 38 farms raising replacement gilts, 39% purchase boar(s). Boar semen is purchased in 86% of the farms: 56% purchase only boar semen; 30% purchase both semen and boar(s) and 14% of farms only purchase boar(s). In 22/57 tested farms, clinical signs evocative of PRRSv infection were observed over the last 10 years. In 30 farms a PRRS diagnostic test was performed in the past with a positive result in 17. When the pig owner did agree and if no vaccination was carried out on sows or on piglets, a serological Elisa test was performed in 10 breeding pigs and/or 5 feeder pigs >70 kg (or in all available sera if a smaller number of pigs was present). Globally, at herd level and at animal level, the apparent prevalence were respectively 35.2% (95% CI: 23.0-47.4%) and 23.4% (95% CI: 20.1-26.6%). [less ▲]

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See detailPrévalence des cas de lymphadénite granulomateuse sous‐maxillaire chez des porcs abattus en Belgique
Vyt, Philip; Denoël, Joseph ULg; Cassart, Dominique ULg et al

Poster (2013, February 06)

In pigs the Mycobacterium avium complex (MAC) causes granulomatous lymphadenitis. Carcasses with such lesions must be detected, as parts of the affected carcasses and organs have to be condemned. These ... [more ▼]

In pigs the Mycobacterium avium complex (MAC) causes granulomatous lymphadenitis. Carcasses with such lesions must be detected, as parts of the affected carcasses and organs have to be condemned. These nontuberculous mycobacteria are opportunistic pathogens which have acquired an increasing importance in public health in recent decades due to their ability to cause lung diseases, lymphadenitis in children and systemic infections in immunocompromised patients ‐ even if the potential risk of infection of an immunocompromised person by MAC in the consumption of undercooked pork still has to be determined. The first objective of this study was to evaluate the prevalence of submandibular granulomatous lymphadenitis in pigs slaughtered in Belgium. Between August 2010 and September 2011, 16,211 carcasses were inspected by the same veterinarian in 2 slaughterhouses – one in Flanders, the other in Wallonia. Eighty‐six suspected cases of submandibular granulomatous lymphadenitis (0.53% of pigs; 95% Confidence Interval: 0.42‐0.65%) were identified, collected and submitted to histopathological (Ziehl‐Neelsen and haematoxylin‐eosin staining) and bacteriological (culture, PCR, molecular typing) tests. The second objective of the study was to characterize lesions and to identify the relative importance of MAC and Rhodococcus equi to explain the lesions. Mycobacterium avium subsp. hominissuis (MAH) was isolated from 6 lymph nodes (7.0%; 95% CI: 2.6‐14.6%) and Rhodococcus equi from 45 (52.3%; 95% CI: 41.3‐63.2%). The final objective of the study consisted in farm investigation to evaluate the possible source of contamination of pigs by MAH. Potential sources such as sawdust, water, wild birds and/or cattle were identified. [less ▲]

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See detailInfluence 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
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Livestock Science (2013), 155

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 ... [more ▼]

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 m2/sow deep-litter or on a 1.8 m2/sow deep-litter plus 1.2 m2/sow concrete floor. In both cases, sows were fed in individual feeding stalls (1.2 m2/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 m2/sow) or partly (1.8 m2/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 m2 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 automatically 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<0.001), carbon dioxide (3.12 vs. 2.90 kg/d.sow; P<0.01) and water vapour (4.70 vs. 4.03 kg/d.sow; P<0.001), and significantly lower for nitrous oxide (3.14 vs. 6.12 g/d.sow; P<0.001) and CO2 equivalents (1.24 vs. 2.10 kg/d.sow; P<0.001) 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>0.05). 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 NH3-emissions, and decreased CO2eq-emissions (-40%). This decrease was observed owing to an important decrease of N2O-emissions (-49%). [less ▲]

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See detailGaseous emissions from fattening pigs offered an ad libitum high-fibre diet and kept on fully slatted floor: preliminary results
Philippe, François-Xavier ULg; Laitat, Martine ULg; wavreille, José et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2012)

According to the literature, the diet composition of livestock can influence polluting gas emissions from agriculture. The aim of this preliminary study was to measure gaseous emissions from fattening ... [more ▼]

According to the literature, the diet composition of livestock can influence polluting gas emissions from agriculture. The aim of this preliminary study was to measure gaseous emissions from fattening pigs offered an ad libitum high-fibre diet (HFD) and kept on fully slatted floor. A batch of 24 fattening pigs was divided into two homogeneous groups randomly allocated to a treatment: conventional cereals-based diet or sugar beet pulpbased diet (HFD). With HFD, a significant decrease of animal performance was observed (837 vs. 962 g for the average daily gain). With pigs offered HFD, gaseous emissions per pig were significantly lower for NH3 (-30%, 6.64 vs. 9.47 g/d; P<0.05) and significantly greater for CH4 (+40%, 6.46 vs. 4.60 g/d; P<0.05). The emissions of N2O (0.34 g/d), CO2equivalent (0.27 kg/d), CO2 (1.68 kg/d) were not significantly influenced by the diet. Due to a more important microbial activity with HFD, the lower NH3-emissions could be attributed to the shift of a part of excreted nitrogen from urine (as urea) to faeces (as protein form), and to a lower slurry pH explained by the increase of volatile fatty acid content. The higher CH4-emissions could be explained by a greater production in the digestive tract and in the slurry due to fibre fermentations. In conclusion, HFD allowed decreasing NH3- and increasing CH4-emissions. However, in terms of climate change, this increase was offset by the decrease of indirect N2O-emissions due to NH3-emission decrease, as indicated by the similar CO2equivalent-emissions in the two groups. [less ▲]

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See detailGaseous emissions from fattening pigs offered an ad libitum high-fibre diet and kept on fully slatted floor: preliminary results
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Proceedings of the International Symposium on Emissions of Gas and Dust from Livestock (2012)

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See detailAmmonia emissions associated to slatted floor and bedded floor systems for fattening pigs and gestating sows
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Proceedings of the International Symposium on Emissions of Gas and Dust from Livestock (2012)

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See detailImpact of the floor type on emissions of ammonia and greenhouse gases from pig houses.
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2012)

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See detailEffets des fibres et du type de sol sur les émissions de gaz à effet de serre et d'ammoniac associées à l’élevage de truies
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in 44èmes Journées de la Recherche Porcine (2012)

A study was carried out to investigate the effect of dietary fibre content (23% of non-starch polysaccharides (NSP) with a standard diet based on cereals vs. 44% of NSP with a fibrous diet based on sugar ... [more ▼]

A study was carried out to investigate the effect of dietary fibre content (23% of non-starch polysaccharides (NSP) with a standard diet based on cereals vs. 44% of NSP with a fibrous diet based on sugar beet pulp) and the floor type (slatted floor vs. straw-based deep litter) on emissions of ammonia (NH3), nitrous oxide (N2O), methane (CH4) and CO2-equivalents (Eq-CO2). Six successive batches of 10 gestating sows were divided into 2 groups kept in 2 experimental rooms differing by the floor type. The standard diet was administered to the sows of the first 3 batches, the fibrous diet to the sows of the next 3 batches. Emissions were measured by infra-red photoacoustic detection. With the slatted floor, the fibrous diet decreased NH3 emission (12.0 vs. 15.5 g sow-1.d-1) but increased the Eq-CO2 emissions (0.69 vs. 0.57 kg sow-1.d-1) in relation to an increase of CH4 emissions (18.4 vs. 12.8 g sow-1.d-1), the N2O emissions not being impacted by the diet, with value around 0.62 g sow-1.d-1. With the straw-bedded floor, the fibrous diet increased the emissions of NH3 (12.3 vs. 9.2 g sow-1.d-1) and CH4 (14.6 vs. 9.6 g sow-1.d-1) but decreased N2O emissions (0.99 vs. 1.64 g/ sow-1.d-1) with the consequence that Eq-CO2 emissions were similar for the two diets, around 0.74 kg sow-1.d-1. [less ▲]

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See detailAnalgésie préemptive du porcelet avant la castration: comparaison de l'effet de l'acide tolfénamique et du méloxicam sur la douleur et le stress
Wavreille, José; Danard, Maylis ULg; Servais, Vincent et al

in 42èmes Journées de la Recherche Porcine (2012)

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See detailAmmonia and greenhouse gas emissions during the fattening of pigs kept on two types of straw floor
Philippe, François-Xavier ULg; Laitat, Martine ULg; Nicks, Baudouin ULg et al

in Agriculture, Ecosystems & Environment (2012), 150

Pig production is an important contributor to polluting gases emissions like ammonia (NH3) and greenhouse gases (GHG). Apart from environmental aspects, animal welfare is also an issue of growing ... [more ▼]

Pig production is an important contributor to polluting gases emissions like ammonia (NH3) and greenhouse gases (GHG). Apart from environmental aspects, animal welfare is also an issue of growing importance. The fattening of pigs on deep litter bedded system is consider as more animal friendly than the fattening on slatted floor, but it is also more expensive and requests more labour. The use of straw flow rather than straw deep litter could be a good compromise because of a reduced need for surface area, straw, labour and manure storage, combined with satisfying animal welfare. In order to evaluate the environmental impact of this rearing technique, a study was designed to quantify pollutant gas emissions of this system compared to the deep litter system for fattening pigs. Three successive batches of 32 Landrace fattening pigs were used. They were divided into 2 homogeneous groups of 16 animals randomly allocated to two treatments: straw deep litter or straw flow. The groups were kept simultaneously for a period of 4 months and separately in two identical rooms in volume (103 m3) and surface (30.2 m2) and fitted either with a deep litter pen (1.2 m2/pig) or with a straw flow system (0.75 m2/pig). Throughout the fattening period, 46.9 and 34.4 kg straw were used respectively per pig. In deep litter pen, the litter was removed after each batch. In the straw flow pen, 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. In both rooms, ventilation was automatically adapted to maintain a constant ambient temperature. Once a month, the emissions of ammonia (NH3), nitrous oxide (N2O), methane (CH4), carbon dioxide (CO2), and water vapour (H2O) were measured continuously for 6 consecutive days by infra-red photoacoustic detection. Animal performance (final body weight, body weight gain, and feed conversion ratio), some carcass quality parameters and manure characteristics were not significantly affected by floor type. With fattening pigs kept in a straw flow pen, gaseous emissions were significantly greater (P < 0.05) for NH3 (+10%) and significantly lower (P < 0.001) for N2O (−55%), CH4 (−46%), CO2 equivalents (−47%), CO2 (−10%) and H2O (−23%) compared to pigs housed on straw-based deep litter. Thus, the use of straw flow system for pig fattening allows reducing the GHG emissions but presents the disadvantage of increasing the NH3 emissions. [less ▲]

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See detailTreatment of a case of trichurosis (Trichuris suis) in pigs
Caron, Yannick ULg; Delleur, Valery; De Bock, Bart et al

Poster (2011, May)

Trichuris suis infection was identified in a pig herd during an investigation into persistent diarrhea and weight loss in 10 recently introduced gilts. Eggs of the parasite were identified in faeces of ... [more ▼]

Trichuris suis infection was identified in a pig herd during an investigation into persistent diarrhea and weight loss in 10 recently introduced gilts. Eggs of the parasite were identified in faeces of gilts. Further investigations failed to detect other causes of diarrhea but, in all production stages, they allowed the detection of eggs of Trichuris suis that could explain pasty faeces sometimes observed in weaned sows and frequent diarrhea found in the early fattening period. The administration of levamisole (intramuscular injection) to gilts allowed the excretion of adult parasites, the treatment of diarrhea and the reduction of the number of eggs per gram of faeces. Taking into account the success obtained with levamisole in gilts, the equipment of the farm and the wish of the farmer no to inject finishing pigs, an unsuccessful treatment was tried based on levamisole in drinking water every 8 and then 5 weeks. Flubendazole was finally administrated in drinking water every 3 and then 5 weeks, reducing significantly the number of eggs per gram of faeces. [less ▲]

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See detailContrôle de l'involution utérine au moyen de l'écographie transabdominale en mode B : validation de la technique
Thilmant; Paniagua, S; Farnir, Frédéric ULg et al

in Colloques de la 43e Journée de la Recherche Porcine (2011, February 15)

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See detailEffects of dietary fibres on greenhouse gas and ammonia emissions associated to gestating sows
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Cabaraux, Jean-François; Delguste, Catherine; Frippiat, thibault (Eds.) et al Proceedings of the 1st Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2011)

Usually, gestating sows are restrictedly-fed to prevent excessive body weight gain and fat deposition. However, feed restriction causes sustained feeding motivation resulting in stereotypic behaviour and ... [more ▼]

Usually, gestating sows are restrictedly-fed to prevent excessive body weight gain and fat deposition. However, feed restriction causes sustained feeding motivation resulting in stereotypic behaviour and impairment of animal welfare. High fibre diets (HFD) are known to reduce feeding motivation without impairments of performance but the effects of HFD on emissions of pollutant gases are very few studied. Thus, a study was carried out to compare the effect of two fibre contents (standard diet (STD) with 22% of non-starch polysaccharides (NSP) vs. HFD with 44% of NSP) on emissions of ammonia (E-NH3), nitrous oxide (E-N2O), methane (E-CH4) and CO2-equivalents (E-EqCO2) associated to gestating sows. Three successive batches of 10 gestating sows were divided into 2 homogeneous groups and randomly allocated to one of two treatments: STD vs. HFD. The groups were kept separately in two identical rooms equipped with a pen divided into a lying area with slatted floor and five individual feeding stalls with permanent access. Emissions were measured by infrared photoacoustic detection. The HFD significantly decreased ENH3 (12.1 vs. 15.9 g/sow.day) but increased E-EqCO2 (0.68 vs. 0.47 kg/sow.day) in relation with an increase of E-CH4 (18.4 vs. 9.1 g/sow.day), E-N2O being not impacted by the diet, with value around 0.60 g/sow.day. So, the effects of HFD offered to gestating sows on slatted floor on environment seem conflicting with a decrease of NH3 emissions which mainly contribute to acidification of soils and waters and eutrophication, but an increase of CO2-quivalents emissions which contribute to greenhouse effect and climate change. [less ▲]

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See detailAmmonia and greenhouse gas emission from group-housed gestating sows depends on floor type
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Agriculture, Ecosystems & Environment (2011), 140

The ban by 2013 in the EU of individual accommodations for gestating sows and the renewed interest for litter systems could promote in the future the group-housing of gestating sows on litter. But what ... [more ▼]

The ban by 2013 in the EU of individual accommodations for gestating sows and the renewed interest for litter systems could promote in the future the group-housing of gestating sows on litter. But what are the environmental impacts of this rearing technique? To answer this question, a study was scheduled to quantify pollutant gas emissions (nitrous oxide -N2O-, methane -CH4-, carbon dioxide -CO2- and ammonia -NH3-) according to floor type in the raising of group-housed gestating sows. The trial was carried out in experimental rooms located at Liège University (Belgium). Three successive batches of 10 gestating sows were used for this trial. Each batch was divided into 2 homogeneous groups randomly allocated to one of two treatments: concrete slatted floor or straw-based deep litter. The groups were kept separately in two identical rooms equipped with a pen divided into a lying area (slatted floor or deep litter) and five individual feeding stalls. The feeding stalls were equipped with front feeding troughs and rear gates preventing access to the stalls outside of the feeding time. Between each batch of sows, the pens were cleaned. In both rooms, ventilation was automatically adapted to maintain a constant ambient temperature. The gas emissions were measured 3 times (weeks 2, 5 and 8 of stay) during 6 consecutive days by infra red photoacoustic detection. Sow performance (body weight gain, backfat thickness, number and weight of piglets) was not significantly affected by floor type. With sows kept on slatted floor, gaseous emissions were significantly greater for NH3 (12.77 vs. 9.05 g d-1 sow-1; P<0.001) and CH4 (10.12 vs. 9.20 g d-1 sow-1; P<0.01), and significantly lower for N2O (0.47 vs. 2.27 g d-1 sow-1; P<0.001), CO2 equivalents (0.44 vs. 0.94 kg d-1 sow-1; P<0.001) and CO2 (2.41 vs. 2.83 kg d-1 sow-1; P<0.001) compared to sows housed on straw-based deep litter. There was no significant difference for water vapour emissions (3.25 vs. 3.21 kg d-1 sow-1; P>0.05). In conclusion, the main environmental disadvantage of the deep litter system pointed to in this study was the greater N2O-emissions and thus greater CO2eq-emissions compared to slatted floor. However, the use of deep litter was related to reduced NH3- and CH4-emissions. [less ▲]

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See detailEffets de la surface disponible et du type de sol sur les émissions gazeuses lors de l’élevage de truies gestantes
Philippe, François-Xavier ULg; Cabaraux, Jean-François ULg; Canart, Bernard et al

in 42èmes Journées de la Recherche Porcine (2010)

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See detailEffects of available surface on gaseous emissions from group-housed gestating sows kept on deep litter
Philippe, François-Xavier ULg; Canart, Bernard; Laitat, Martine ULg et al

in Animal (2010), 4(10), 1716-1724

In the European Union, the group-housed pregnant sows have to have a minimal legal available area of 2.25m²/sow. However, it has been observed that an increased space allowance reduces agonistic behaviour ... [more ▼]

In the European Union, the group-housed pregnant sows have to have a minimal legal available area of 2.25m²/sow. However, it has been observed that an increased space allowance reduces agonistic behaviour and consecutive wounds and thus induces better welfare conditions. But, what about the environmental impacts of this greater available area? Therefore, the aim of this study was to quantify pollutant gases emissions (nitrous oxide, N2O, methane, CH4, carbon dioxide, CO2 and ammonia, NH3), according to the space allowance in the raising of gestating sows group-housed on a straw-based deep litter. Four successive batches of 10 gestating sows were each divided into two homogeneous groups and randomly allocated to a treatment: 2.5 v. 3.0m²/sow. The groups were separately kept in two identical rooms. A restricted conventional cereals based diet was provided once a day in individual feeding stalls available only during the feeding time. Rooms were automatically ventilated. The gas emissions were measured by infra red photoacoustic detection during six 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 space allowance. In the room with 3.0m²/sow and compared with the room with 2.5m²/sow, gaseous emissions were significantly greater for NH3 (6.29 v. 5.37 g NH3-N/day per sow; P<0.01) and significantly lower for N2O (1.78 v. 2.48 g N2O-N/day per sow; P<0.01), CH4 (10.15 v. 15.21 g/day per sow; P<0.001), CO2 equivalents (1.11 v. 1.55 kg/day per sow; P<0.001), CO2 (2.12 v. 2.41 kg/day per sow; P,0<001) and H2O (3.10 v. 3.68 kg/day per sow; P<0.001). In conclusion, an increase of the available area for group-housed gestating sow kept on straw-based deep litter seems to be ambiguous on an environmental impacts point of view. Compared with a conventional and legal available area, it favoured NH3 emissions, probably due to an increased emitting surface. However, about greenhouse gases, it decreased N2O, CH4 and CO2 emissions, probably due to reduced anaerobic conditions required for their synthesis, and led to a reduction of CO2 equivalents emissions. [less ▲]

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See detailGaseous emissions from group-housed gestating sows kept on deep litter and offered an ad libitum high-fibre diet
Philippe, François-Xavier ULg; Canart, Bernard; Laitat, Martine ULg et al

in Agriculture, Ecosystems & Environment (2009), 132

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 ... [more ▼]

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. [less ▲]

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See detailGaseous emissions associated to a high-fibre diet fed to gestating sows group-housed on deep litter
Philippe, François-Xavier ULg; Canart, B.; Laitat, Martine ULg et al

in Proceeding of the XIV ISAH Congress (2009)

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