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- Ahmmad, Sheikh Rishad, et al.
(författare)
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Impact of Building Geometry, Window Types, and Materials on Daylighting Performance of Livestock Buildings
- 2024
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Ingår i: 15th International Congress on Agricultural Mechanization and Energy in Agriculture - ANKAgEng 2023. - 2366-2565 .- 2366-2557. - 9783031515781 ; 458 LNCE, s. 262-274
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Konferensbidrag (refereegranskat)abstract
- The availability and quality of natural light in livestock buildings affect the welfare and productivity of animals and their caretakers, while affecting the energy performance of the buildings. This study investigated the impact of different building properties on daylight conditions of livestock buildings. The study was conducted via parametric daylight simulations in Climatestudio. Firstly, building geometries with different facade orientations, width-to-length ratios, and roof pitches were simulated. Secondly, different glazing types, sizes, and locations were considered for their respective daylight performance. Finally, the use of different materials for the facade, floor and roof of the buildings were simulated and comparatively analysed. The study analysed the simulation results to assess daylight availability in relation to different building properties. The results provided insight that can help determine building geometry, window properties, and material selection during the design process. Overall, the study highlighted the importance of further research and development of design guidelines and standards that incorporate these factors to improve the daylighting performance of these buildings, while ensuring animal welfare and productivity.
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| 3. |
- Hagberg, Cecilia, et al.
(författare)
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Floor cooling for growing finishing pigs during warm conditions – impact on pig hygiene, thermal and gaseous environment.
- 2024
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The changing climate, with higher temperatures, is challenging pigs’ abilities to lose metabolic heat.This study was conducted during two summers (2022 and 2023) on a commercial pig farm in Sweden,latitude 59.7°N, using a change over design. In one pig unit the solid floorings, in partly slatted pens(8.96 m2, solid lying area 71% and slatted dunging area 29%), were cooled whilst the solid flooringsin the adjacent pig unit had no cooling. Each pig unit had 38 pens with 9-10 pigs/pen (LYxH, mixedsexes, ~35-115 kg, undocked). Cooling was conducted by circulating chilled water (~11℃) in thewaterborne pipes casted in the concrete. Concentrations of ammonia (NH3) and carbon dioxide(CO2) were measured with a photoacoustic gas monitor 1512 and a multipoint sampler 1409(Lumasense Technologies A/S, Denmark) above four focal pens/pig unit, in addition to samplingpoints by one air inlet and by one exhaust fan in each unit. Temperature and relative humidity werecontinuously registered with loggers (Gemini Data Loggers Ltd., UK) mounted next to the samplingpoints of NH3 and CO2, and close to the lying area in the focal pens. Pig hygiene was assessedaccording to a protocol developed based on literature. Statistical analyses were performed usingPROC GLM in SAS version 9.4. Preliminary results show that the proportion of pigs with the mildesthygiene score (<20 % of the body dirty) were higher in cooled compared to control pens (on average44.6±1.30 vs. 28.8±1.03 % of pigs in the pen (LSM±SE), p<0.001). In accordance, the correspondingproportion of pigs with the most severe hygiene score (>50 % of the body dirty) were lower in cooledpens compared to control (on average 31.8±1.37 vs. 47.9±1.37 % of pigs in the pen (LSM±SE),p<0.001). In addition, the results show lower levels of both NH3 and CO2 with floor coolingcompared to the control (2.9±0.03 vs 4.0±0.03 ppm NH3 and 1345±3.9 vs 1376±3.9 ppm CO2(LSM±SE), p<0.001 for both). The average temperature was lower in the unit with cooled floortreatment compared to control, both in the sample points above the pen (20.7±0.03 vs. 21.2±0.03 ºC(LSM±SE), p<0.001) and closer to the floor in the lying area (26.3±0.06 vs. 27.7±0.07 ºC (LSM±SE),p<0.001) while there were no significant differences in relative humidity between treatments. Theresults indicate a favourable effect of floor cooling on pig hygiene, thermal and gaseousenvironment.
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| 8. |
- Jeppsson, Knut-Håkan, et al.
(författare)
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Cooling growing/finishing pigs with showers in the slatted area: Effect on animal occupation area, pen fouling and ammonia emission
- 2021
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Ingår i: Livestock Science. - : Elsevier BV. - 1871-1413 .- 1878-0490. ; 243
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Tidskriftsartikel (refereegranskat)abstract
- Growing and finishing pigs kept in insulated buildings are often exposed to high ambient temperature during summer. In high-temperature conditions, pigs in partly slatted pens change their behaviour to increase lying on the slatted area and fouling on the solid Hoor area, resulting in increased ammonia emissions. One way to cool the animals is to shower/sprinkle water in the slatted area, allowing pigs to wet their skin to increase heat loss. This study examined the effects of providing showers on pig activity and occupation area in pens, pen fouling and ammonia emission from the room. The investigation was performed in a commercial growing-finishing house with 10 identical rooms, each containing 16 pens for 9-13 pigs growing from 25-30 kg to 115-120 kg. Pigs were introduced into two parallel rooms in the house. During two summers and four batches, one room with showers in the slatted area and one room without per batch were compared in terms of concentrations of carbon dioxide (CO2) and ammonia (NH3), pig activity and occupation area in the pen, pen fouling and NH3 emissions, recorded on four measuring occasions (M1-M4) during the growing period. Gas concentrations were measured using a photoacoustic analyser, pig activity and occupation area detected by machine vision techniques and pen fouling was visually investigated. Climate parameters (air temperature and relative humidity) were logged continuously during the entire growing period. Ammonia emission was calculated from ventilation rate (determined by the indirect CO2 tracer gas method) and the difference in ammonia concentration between outlet and inlet air.The results showed that the pigs spent less time lying on the slats (p < 0.05) and the solid Hoor was cleaner (p < 0.05) on measuring occasions M2, M3 and M4 in rooms with showers than in control rooms. Mean NH3 emission for the four measurement occasions were 3.0-5.1 g pig(-1) day(-1) and 4.2-10.0 g pig(-1) day(-1) for the shower and control rooms, respectively. The differences were significant (p < 0.05) for all measuring occasions. The results also show improved animal environment when using showers to cool pigs at high ambient temperatures.Overall, providing showers in the slatted area in partly slatted pens encouraged growing/finishing pigs to lie in the lying area, reduced problems with pen fouling and decreased NH3 emissions by 45%. The latter could be partly due to reduced pen fouling and partly to dilution of urine on the slatted area and on the surface of slurry in the pit.
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| 9. |
- Jeppsson, Knut-Håkan, et al.
(författare)
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Environmental and economic consequences of pig-cooling strategies implemented in a European pig-fattening unit
- 2021
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Ingår i: Journal of Cleaner Production. - : Elsevier BV. - 0959-6526 .- 1879-1786. ; 290
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Tidskriftsartikel (refereegranskat)abstract
- The increased frequency of hot days due to climate change can potentially impair the environmental and economic performance of pig-fattening farms. Several pig-cooling strategies have been proposed to address these impacts, however their implementation is not always economically viable and the potential environmental-economic trade-offs not well understood. Here, we propose and implement a novel framework for environmental and economic evaluation of pig-cooling strategies in a whole farm context. We also demonstrate through a sensitivity analysis how such models can be integrated with projected climate data to investigate how climate change may affect the assessment of capital investments that are made over significant timescales. We considered two strategies implemented in a pig fattening farm in south Sweden: pig-cooling with showers and with increased air velocity. Operation of the farm under non-cooling conditions was considered as the baseline system against which the analysis was conducted. We calculated whole-farm annual equivalent values (AEV) with the implementation of each strategy through a discounted cash flow analysis and annualised system environmental impact through a life cycle assessment. Both cooling strategies significantly reduced system environmental impact across all categories except water footprint. Acidification potential was reduced the most, exhibiting a-3.28% reduction with pig showers and-1.51% with increased air velocity. Farm profitability improved by +6.79% with showers and +3.37% with increased air velocity. Ambient temperature increase under non-cooling conditions significantly increased all impact categories with acidification being affected the most (+2.24%), and caused a-4.43% decrease in AEV. Both pig-cooling strategies mitigated these effects on system environmental performance. With increased air velocity we observed a +0.718% increase in acidification, while pig showers were the more resilient option exhibiting a +0.690% increase. The study represents a case-in-point for how to rationalise economically environmental management technologies in pig housing systems based on their cost-effectiveness in mitigating environmental impacts.(c) 2021 Elsevier Ltd. All rights reserved.
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| 10. |
- Jeppsson, Knut-Håkan, et al.
(författare)
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Fiberströ till mjölkkor – effekt på djurvälfärd, djurhälsa, mjölkkvalitet och kostnaden för strömedel
- 2023
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Ingår i: LTV-fakultetens faktablad.
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Genom att separera gödseln får man gödselfiber (fiberströ) som kan användas som strömedel till mjölkkorna. I denna studie jämförde vi 17 gårdar som använde fiberströ med 17 gårdar som använde såg-/kutterspån som strömedel i liggbås till mjölkkor. Fiberströ jämfört med såg-/kutterspån påverkade inte mjölkmängd, celltal i tankmjölk, djurvälfärd eller djurhälsa förutom att klövhälsan var bättre eftersom totala anmärkningar, klöveksem och klövsulesår var lägre. Totalantalet bakterier var högre i oanvänt fiberströ och i fiberströ från liggbåsen än för såg-/kutterspån men i tankmjölken var det ingen skillnad. Kostnaden för fiberströ varierade för gårdarna beroende på hur mycket fiberströ som producerades.
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