Grete H. M. Jørgensen
Research Scientist
Biography
Education and areas of interest:
PhD within ethology with emphasis on animal environment and animal welfare. Have been working with thermoregualtion, climate, sensortechnology and animal preferences. My PhD project dealt with physical and social environment for sheep during the long indoor feeding period.
Professional qualifications:
- Experienced project leader within the NIBIO system. I have also worked for the Forskerforbundet organisation.
- Competence within data processing and statistical analysis.
- Scientific co-supervisor for several bachelor and masters students. Experience as teacher, lecturer and cesor.
- Have been publishing international papers on many different animal species.
- Themoregulation and social behaviour in horses.
- Experience with measurement of methane from ruminants (respiration chambers and the SF6 method)
- Development and testing of sensor technology for surveillance of animals both in barns and on rangeland pastures.
- Experience as project leader for several reindeer projects. For example: Stress and welfare for reindeer during handling, Health risks and hazards for reindeer herders, welfare indicators for reindeer and virtual fencing.
- Participated in several INTERREG projects. For example Animal Sense (Interreg Botnia Atlantica 2012-2019)
- Is appointed Person with special control responsibility for the animal welfare unit in NIBIO, and at the endorsed research animal facility at Tjøtta.
Abstract
The experiment aimed to investigate the effectiveness of a Monil virtual fence collar for small ruminants on mature Norwegian White ewes at the NIBIO Tjøtta station. The study aimed to evaluate the animals' learning ability and welfare, compare two auditory cues (Original vs. Modified; collar treatment), and examine the effects of wool (Shaved vs. Unshaved) on the efficacy of the virtual fence system. A total of 16 ewes were randomly assigned to two groups of 8, each equipped with one of the collars, and further divided based on wool treatment. Two mirrored training arenas were set up for the two groups. For two days, the collared animals had unrestricted access to graze the entire arena (VF-Off). This was followed by two days of restricted access to 2/3 of the arena using the virtual fence collars (VF-On). After the fourth day, the animals were switched to the other arena as a crossover design, and the sequence of VF-Off and VF-On was repeated. Data collected included position and cue logs from the virtual fence collars, heart rate monitors, and observation data gathered through three methods: Video Surveillance, Direct Observation Time Budget, and Pressure Marks Assessment. Our results indicate that the ewes were able to learn to avoid restricted zones effectively, relying more on auditory cues than on electrical cues. The virtual fence cueing imposed short-lived stress (acute stress), with both behavioral and physiological metrics returning to baseline levels within five minutes. Additionally, exclusively auditory cues resulted in less stress compared to cues associated with electrical stimulation. No indicators of chronic behavioral stress were observed. However, we found that the collars needed to move freely on the animals' necks to prevent pressure marks, suggesting that the ewes should be shaved around their necks before wearing the collars. While collar treatment showed no significant effects, wool treatment indicated that the shaved group was more compliant with the virtual fence system due to reduced insulation, which enhanced the effectiveness of electrical cues. During the deployment with the unshaved group, there were three instances in which the animals received an electrical cue that did not elicit the animal response, allowing for their “escape” over the virtual fence boundary. Therefore, equipping the virtual fence on shaved animals is paramount for enhancing the system's reliability. If the suggestion is followed, the system can effectively be used for sheep without compromising animal welfare.
Abstract
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Abstract
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Division of Food Production and Society
Giving the horse a voice - Horse welfare and owner awareness
Division of Food Production and Society
Techgraze – Integrating Advanced Technologies for Enhanced Grazing Practices in Norway
In Norway, a declining grazing pressure and farm abandonment have led to undesirable ecological and socio-economic outcomes. The TechGraze project aims to address these challenges by integrating Virtual Fencing (VF) and Remote Sensing (RS) technologies to enhance pasture-based livestock management.