Browsing Doctoral theses (VetMed) by Title
Now showing items 28-47 of 129
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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 ... -
Effects of gonadotropin-releasing hormone agonist on brain development and aging : results from two animal models
(PhD Thesis;2014:32, Doctoral thesis, 2014)Normal brain maturation is the result of many structural and molecular changes that can be modulated by endocrine variables and is associated with brain plasticity and sex- and age specific differences in cognitive ... -
Effects of meat and meat components on intestinal carcinogenesis in the A/J Min/+ mouse model
(PhD Thesis;2017:06, Doctoral thesis, 2017)Colorectal cancer (CRC) represents a major public health burden worldwide, and particularly in the developed countries. Sporadic CRC has been associated with a number of lifestyle factors, including smoking, alcohol ... -
Effects of persistent organic pollutants (POPs) on the steroidogenesis of primary neonatal porcine Leydig cells
(PhD thesis;2019:7, Doctoral thesis, 2019)After World War II the production of manmade chemicals has increased immensely. They are made to give desired practical properties and functions. Some are added to consumer products to provide conductivity, increase flame ... -
Effects of the brain-infecting parasite Pseudoloma neurophilia in laboratory zebrafish (Danio rerio)
(PhD thesis;2020:40, Doctoral thesis, 2020)Zebrafish (Danio rerio) are increasingly popular model animals in scientific fields ranging from behavioural ecology to neurobiology. It is therefore of increasing concern that half of all zebrafish research facilities are ... -
Effects of the hatchery environment on neurobiology and behaviour in Atlantic salmon : implications for stocking
(PhD Thesis;2018:80, Doctoral thesis, 2018)The Atlantic salmon (Salmo salar) is an iconic fish species with a widespread historic abundance, but recent decades have witnessed a dramatic decline in wild stocks due to a variety of anthropogenic factors, especially ... -
Effects of the rearing period and the production phase on fear-related responses in adult laying hens
(PhD Thesis;2017:48, Doctoral thesis, 2017)In 2013, almost seven billion laying hens (Gallus gallus domesticus) produced eggs for human consumption (CIWF, 2013). Under commercial egg production, specialised rearing farmers keep the birds until they are nearly ... -
Environmental persistent organic pollutants (POPs) : their interactions with behavior and development of colorectal cancer
(PhD Thesis;2022:9, Doctoral thesis, 2022)Persistent organic pollutants (POPs) are a class of chemicals formerly widely used by the production industry and as pesticides in agriculture. Some of them are suspected endocrine disruptors and may interfere with hormone ... -
Epidemiologic studies of bovine respiratory syncytial virus and bovine coronavirus in Norway
(PhD Thesis;2019:32, Doctoral thesis, 2019)Bovine respiratory syncytial virus (BRSV) and bovine coronavirus (BCV) cause respiratory infection in cattle worldwide. In addition, BCV also causes diarrhoea in calves and contagious diarrhoea in adult cows, i.e. winter ... -
Epidemiological investigations of footrot in the Norwegian sheep population
(PhD Thesis;2015:22, Doctoral thesis, 2018-04-24)Footrot is a contagious disease where Dichelobacter nodosus, a Gram negative bacterium, is the necessary transmitting agent. The disease mainly affects small ruminants. The clinical signs range from mild inflammation in ... -
Epidemiological studies of influenza A(H1N1)pdm09 virus infections in the Norwegian pig population
(PhD Thesis;2016:99, Doctoral thesis, 2016) -
Epidemiological, aetiological and prognostic aspects of canine primary bone cancer, with a view to its human counterpart
(PhD Thesis;2015:86, Doctoral thesis, 2017-07-05)Osteosarcoma (OSA) is the most common histological subtype of primary bone cancer in both humans and dogs. The importance of this relatively rare malignancy in humans is underlined by the fact that it typically affects ... -
Epidemiology of orthopaedic conditions in companion animals with emphasis on cranial cruciate ligament disease
(PhD Thesis;2019:78, Doctoral thesis, 2019)Lameness caused by orthopaedic disease is an important reason for owners to take their dog or cat to the veterinarian. Many diagnoses, such as cranial cruciate ligament disease (CCLD), considered the most common cause of ... -
Epidemiology of viral haemorrhagic fevers : seroprevalence and risk factor modelling of Ebola and Marburg viruses in Uganda
(PhD Thesis;2018:12, Doctoral thesis, 2018)Ebola and Marburg virus diseases, caused by Ebolavirus and Marburgvirus (filoviruses) respectively, are viral haemorrhagic fevers of public health importance. This is because of associated severity and impact on global ... -
Exploring physiological functions of the prion protein in a new animal model
(PhD Thesis;2019:35, Doctoral thesis, 2019)The cellular prion protein (PrPC) has been intensively studied for its role in the pathogenesis of transmissible spongiform encephalopathies, such as Creutzfeldt-Jakob disease in human, bovine spongiform encephalopathy in ... -
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 ... -
Factors affecting calf production in Norwegian suckler herds
(PhD Thesis;2016:68, Doctoral thesis, 2016)The overall aim of this project was to determine factors affecting productivity in Norwegian suckler herds by concentrating on four objectives: 1) to evaluate the usefulness of an automatic activity monitoring system (AAMS) ... -
From horses to humans : a comparative study developing the first protocol for measuring upper airway pressures in exercising humans
(PhD Thesis;2021:44, Doctoral thesis, 2021) -
Functional characterization of the germination receptors in the spore-forming species Bacillus licheniformis
(PhD Thesis;2017:80, Doctoral thesis, 2017)The food industry experience extensive losses worldwide due to food spoilage caused by microbial activity. Endospore-forming bacteria, such as members of the genera Bacillus and Clostridium, are becoming increasingly ... -
Genetic studies of canine anxiety
(PhD Thesis;2016:51, Doctoral thesis, 2017-07-04)Canine anxiety is a common behavioral problem in dogs, affecting the dog’s welfare and health, and causing a strain in the relationship between the dog and its owner. Undesirable behaviors, including anxiety disorders, ...