| 1. |
- Meiner, Mie, et al.
(author)
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Byggnader och inhysningssystem för lammproduktion
- 2009
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Reports (other academic/artistic)abstract
- I den här rapporten kombineras erfarenheter från studiebesök på gårdar i såväl Sverige som utomlands, med uppgifter från svensk och internationell litteratur som berör inhysning av får. Författarna har gjort studiebesök på 16 svenska gårdar, och dessutom studieresor till Danmark, Norge, Finland och USA. Avsikten är att ge en så heltäckande bild som möjligt av de inhysningsmöjligheter som förekommer, och som skulle vara möjliga i en rationell svensk fårproduktion. Rapporten behandlar produktionsformer, inredning, utrustning och planlösningar samt byggnadens utformning.
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| 2. |
- Nimmermark, Sven, et al.
(author)
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Effects of light on bird activity and carbon dioxide emissions from laying hens housed in an experimental building
- 2014
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Other publication (other academic/artistic)abstract
- Illumination is important in poultry houses since it affects production and it may also influence bird behaviour and wellbeing. Different types of light sources as well as their illuminance level may affect the birds differently. Experiments were made with the aim to study three different light sources, 1) conventional light bulbs, 2) common strip lights, and 3) daylight strip lights as light sources for laying hens and the effect of their illuminance levels on bird activity and CO2 emissions. About 400 laying hens of the hybrid LSL (Lohmann Selected Leghorn) were housed in a small poultry house (climate chamber) at the SLU research station Alnarps Södergård. The total area of the chamber including walking alleys is 87 m2 and the laying hens were kept on a 47 m2 large area. The housing system (Fienhage GmbH, Germany) included a bedding area with sand and a manure bin area with a drainable floor above which drinking nipples, automatic feed conveyors, and perches were placed. The manure belts below the drainable floor were running once every day. Laying nests were placed close to one of the walls. Since the chamber is surrounded by an air conditioned indoor space it was possible to keep the poultry house temperature constant at about 20 °C. The air flow rate was manually adjusted with a damper in an exhaust air duct and calculated from air velocities measured in 5 points in a circular duct. It was kept at 1.2-1.6 m3 hen h-1 during the experiments. Temperatures were recorded by thermocouples; RH was recorded by Rotronic Hygromer®-C80 sensors, and carbon dioxide concentration was measured by an optical analyzer (RI-221, Riken Keiki Co). Animal activity was measured by sensors developed at Research Center Bygholm, Denmark. Illuminance was varied in the experiments and calculated from values measured by a hand holding Lux meter at 18 different places in the chamber. The range of illuminance levels for conventional light bulbs (LB), common strip lights (SL), and daylight strip lights (DSL) were 8-52, 5-63, and 4-93 lux respectively. The experiments started in November when the hens were about 20 weeks old and ended in June the year after. In the experiments the illuminance for LB, SL and DSL were on average 15.7, 24.0, and 40.8 lux. Corresponding values for activity and CO2 emissions were 0.28, 0.51, and 0.76 for activity and 3.78, 4.20, and 4.12 g hen-1 h-1 for CO2 emissions respectively. Pearson correlations showed a significant positive relationship between illuminance and activity (p<0.01), and also between day after start of the experiments and activity (p<0.001). A higher R2-value (79.9%) was found in a regression where both illuminance and day after start of experiments were predictors for activity, while a small R2-value was found when using just illuminance as predictor. The data in the study did not reveal any significant differences in bird activity or CO2 emissions for the three studied light sources. The increased activity by age (or season) was unexpected since the hens had no light from outside.
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