BOKU - Universität für Bodenkultur Wien - Forschungsinformationssystem
Gewählte Diplomarbeit / Masterarbeit:
Esther Elisabeth Kunert
(2021):
Effektive Kühlung durch Schweineduschen im Auslauf:
Was sagt die Infrarotthermografie?.
Diplomarbeit / Masterarbeit - Institut für Nutztierwissenschaften (NUWI),
BOKU-Universität für Bodenkultur,
pp 108.
UB BOKU
obvsg
FullText
- Abstract:
- For pigs kept in organic housing systems with access to concrete outdoor runs showers are increasingly important to alleviate heat stress. The aim of this master thesis was to investigate the effectiveness of showers in the outdoor run by measuring skin surface temperature (SST) with infrared thermography. Therefore, experiments were conducted on three commercial organic farms in Austria (AT) and Switzerland (CH), including 4-6 pens of growing-finishing pigs per farm (total of 428 pigs). In half of the outdoor runs mist-like sprinklers were installed, which ran 5-6 times per day for 30 minutes, followed by a 30- (CH) or 60-minutes (AT) break. On 2-3 days with outside temperature exceeding 22 °C, thermal images were taken on group-level. The SST were recorded before and during shower, as well as 20 min after the end of the shower (only AT). The same schedule was applied to control pens. The non-thermal windows (NTW) shoulder, thigh, flank and back of the ear as well as the thermal window (TW) ear base were selected as regions of interest. Before starting the analysis, Inter-Observer Reliability (IOR) was tested. Based on the IOR results, measurements from the back of the ear were excluded. Regarding the effect of showers, the collected data were analyzed using linear mixed effect models with treatment as fixed effect. The SST of pigs in experimental pens in AT was reduced during shower activation by 1.3 and 2.7 °C for NTW and TW, respectively, while SST of pigs in control pens remained approximately the same (p=0.084 for NTW; p=0.057 for TW). However, there was no evidence of long-term cooling 20 min after the shower stopped. In CH, the SST of NTW in experimental pens was 2.2 °C cooler during the shower, while SST did not differ in control pens (p=0.017). In conclusion, showers in the outdoor run can provide an effective cooling possibility and improve thermal comfort of pigs under practical conditions.
- Beurteilende*r: Leeb Christine
- 1.Mitwirkender: Winckler Christoph
- 2.Mitwirkender: Wimmler Cäcilia