Doctoral theses (VetMed)
Unless otherwise stated on the individual theses, the works in this collection are licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Recent Submissions
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The importance of nest building in sows and of farmer`s management around farrowing for maternal behaviour and piglet survival
(PhD Thesis;2018:106, Doctoral thesis, 2018)The sow is highly motivated to build a nest before farrowing to protect her piglets against climatic factors and predation, and to establish a bond to her offspring. Access to nestbuilding material, required by Norwegian ... -
Regulation of pituitary gonadotropes by sex steroids and photoperiod in medaka
(PhD Thesis;2023:44, Doctoral thesis, 2023)To adapt to the changing physiological states throughout the reproductive cycle, the pituitary needs to fine-tune the production and secretion of gonadotropin hormones (FSH and LH), which regulate gonadal maturation. Until ... -
Serological diagnosis of maedi-visna in Norwegian sheep
(PhD Thesis;2024:35, Doctoral thesis, 2024)Maedi-visna (MV) is a disease which affects small ruminants. The disease is caused by maedi-visna virus (MVV), and is spread worldwide. As there is no treatment or vaccine for the disease, effective surveillance and control ... -
Piscine orthoreovirus : genetic variants and virulence
(PhD Thesis;2024:16, Doctoral thesis, 2024)Piscine orthoreovirus (PRV) is a virus of salmonids. It is widespread and the causative agent of Heart and Skeletal Muscle Inflammation (HSMI) in farmed Atlantic salmon (Salmo salar). Different variants of PRV-1 differ in ... -
Effects on intestinal health of yeast used as a protein source in diets for Atlantic salmon (Salmo salar)
(PhD Thesis;2024:49, Doctoral thesis, 2024)The replacement of traditional protein sources with alternative proteins in salmonid feed is an inevitable consequence of the expansion of aquaculture and the diminishing availability of fish meal (FM). Introduction of ... -
The effects of vitamin K on enterohemorrhagic Escherichia coli
(PhD thesis;2024:24, Doctoral thesis, 2024)Enterohemorrhagic Escherichia coli (EHEC) is the cause of foodborne outbreaks, hospitalizations, and deaths worldwide. Today, no optimal treatment for EHEC infections exist, as antibiotics may increase production of Shiga ... -
Inflammatory conditions in the musculoskeletal system of salmonids in Norwegian aquaculture in relation to melanized changes
(PhD Thesis;2023:79, Doctoral thesis, 2023)Norwegian salmonid aquaculture has become one of Norway's largest industries. With a yearly export of 1.25 million tons, Norway is the largest producer of Atlantic salmon worldwide. Norway also has a significant production ... -
Chronic wasting disease and sheep : studies of species barriers
(PhD thesis;2024:32, Doctoral thesis, 2024)Prion diseases are neurodegenerative disorders in both humans and animals, and can manifest as sporadic, genetic, or acquired conditions. The shared etiology lies in the conformational transformation of the normal cellular ... -
The role of the blood supply to growth cartilage in physeal osteochondrosis and septic arthritis/osteomyelitis in foals and pigs
(PhD Thesis;2019:73, Doctoral thesis, 2019)Long bone growth takes place by enchondral ossification of growth cartilage, a temporary tissue only present at the articular-epiphyseal cartilage complex (AECC) and the physis in skeletally immature animals and humans. ... -
Lipid and choline supply affect Atlantic salmon enterocyte steatosis : in vivo and in vitro studies
(PhD thesis;2024:10, Doctoral thesis, 2024)The shift of farmed Atlantic salmon from a marine- to plant-based diet the last decades has revealed challenges concerning the dietary requirements necessary to ensure fish health. Of the nutrients lacking in plant feeds, ... -
Genetic studies of distichiasis in the Staffordshirebull terriers and cataract in Norwegian buhunds
(PhD Thesis;2024:02, Doctoral thesis, 2024)Denne avhandlingen tar for seg de to vanligste øyesykdommene hos hunderasene Norsk buhund og Staffordshire bull terrier. De to første artiklene i avhandlingen omhandler øyesykdommen distichiasis hos Staffordshire bull ... -
Use of zirconium and chitosan coagulants for physicochemical and hygienic water treatment
(PhD Thesis;2018:48, Doctoral thesis, 2018)Use of aluminium and ferric salts for drinking water production is almost global. Beneficial aspects of their use are extensively recognized. However, factors, such as deteriorating water quality, health concerns and ... -
Levels of persistent organic compounds and heavy metals in farmed and wild fish from Zambia and Tanzania, and assessment of possible health effects
(PhD thesis;2023:9, Doctoral thesis, 2023)Pollution of water bodies due to human activities is a threat to sustainable fisheries. Pollutants like heavy metals and persistent organic pollutants (POPs) can affect biological functions in fish and human. This leads ... -
Neonatal colisepticemia in broiler chickens : -Avian pathogenic Escherichia coli and risk factors for high first week mortality
(PhD Thesis;2023:48, Doctoral thesis, 2023)Broiler chicken meat is regarded lean and more sustainable than meat from other terrestrial production animals. Because of this, the industry is continuing to grow globally. To maintain animal welfare, production sustainability ... -
Pulmonary micrometastasis and immunological pre-metastatic niche in dogs with osteosarcoma
(PhD Thesis;2023:49, Doctoral thesis, 2023)Cancer is currently ranked as a leading cause of death in humans and dogs, most often due to metastatic disease. The pre-metastatic niche (PMN) represents the metastasis-supporting microenvironmental changes that occur ... -
Effects of environmental complexity during rearing and laying on fearfulness, spatial cognition and neural plasticity in laying hens
(PhD Thesis;2023:56, Doctoral thesis, 2023)Due to an increased demand from citizens, the egg industry in the European Union is moving towards more welfare friendly housing systems. However, these environments are often more complex, and hens are still exposed to ... -
In vitro investigations on infections with bovinecoronavirus and Cryptosporidium parvum
(Doctoral thesis, 2023)Intestinal infection causing diarrhoea is a major health problem among calves accounting for about 40% of calf diseases in Norway. Calves are especially susceptible to gastroenteritis during the first month of life of which ... -
Extended spectrum cephalosporin-resistant E. coli from poultry : virulence-associated traits and their zoonotic potential
(PhD Thesis;2022:76, Doctoral thesis, 2023)Antimicrobial resistant microbes have become a global problem. In Norway, ESCresistant E. coli was discovered on retail poultry meat through the Norwegian monitoring program for antimicrobial resistance in bacteria from ... -
Intestinal functions and health of Ballan wrasse (Labrus bergylta) and lumpfish (Cyclopterus lumpus) : effects of variation in diet composition
(PhD thesis;2023:8, Doctoral thesis, 2023)To rear cleaner fish together with Atlantic salmon (Salmo salar) is a biological strategy to keep sea lice away from the salmon. Ballan (B) wrasse (Labrus bergylta) and lumpfish (Cyclopterus lumpus) are the two species ... -
In vitro embryo production in Norwegian Duroc and Landrace pigs
(PhD Thesis;2022:22, Doctoral thesis, 2022)The use of embryo technology is of interest in pig breeding to increase genetic gain in the breeding program and disseminate genetics of superior animals worldwide with less transportation of live animals and a lower ...
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