Browsing Faculty of Biosciences (BioVit) by Document Types "Doctoral thesis"
Now showing items 1-20 of 156
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A comparison of organic grass-clover silages from primary growth and regrowth in dairy cows
(PhD Thesis;2016:24, Doctoral thesis, 2017-12-06)The annual milk yield of Norwegian organic dairy cows increased by 18% in 2013 compared to 2007 levels. The increased milk yield in this period was achieved by increased levels of concentrate feed in the diet. Given that, ... -
A quantitative genetic study on the proportion of males in tilapia
(PhD Thesis;2011:63, Doctoral thesis, 2011)Early sexual maturation is one the main constraints in Tilapia farming since early breeding causes stunted growth and large size variability. To circumvent this problem all-male populations are used commercially, and ... -
Abscission in poinsettia, a methodology and –omics approach
(PhD Thesis;2018:39, Doctoral thesis, 2018)Plants detach organs in a highly controlled process called abscission. Leaves, flowers, seeds, fruits, berries and even roots abscise from the plant in response to pathogens or environmental and developmental stimuli. The ... -
Aerobic exercise training for improving robustness of Atlantic salmon (Salmo salar)
(PhD Thesis;2012:29, Doctoral thesis, 2012)Exercise training produces a wide range of benefits to fish kept in captivity. Research has shown that among several other parameters, growth, feed efficiency, feed intake and cardiac capacity are improved. In higher ... -
Alleles of adaptive importance for barley cultivation in a subarctic climate / Magnus Göransson
(PhD thesis;2023:51, Doctoral thesis, 2023)Barley is the most grown cereal in the Nordic countries, and the fourth most important cereal crop globally. Its use is mainly for feed, but a large portion is also used by the brewing industry. At northern latitudes, such ... -
Alternative systems for Norwegian sheep production: extending fresh meat season and meeting niche market demands
(Phd Thesis;2020:49, Doctoral thesis, 2020)Norway has the largest sheep population (>1 million winterfed ewes) in Scandinavia. Sheep farming is taken as a part-time activity by most farmers. The focus of this PhD study has been on increasing year-round fresh meat ... -
Antarctic krill (Euphausia superba) as a feed ingredient for salmonids with focus on the shell fraction and fluoride
(PhD Thesis;2011:21, Doctoral thesis, 2011)Antarctic krill (Euphausia superba) may be the largest biomass of a single species worldwide and is a promising ingredient for use in fish feeds. Krill have a balanced amino acid profile, and krill lipids are rich in ... -
Assessing personality traits in dogs : conceptual and methodological issues
(PhD Thesis;2017:72, Doctoral thesis, 2017)Animal personality is defined by consistent between-individual differences in behaviour through time or across contexts. Behaviour is further organised into broader behavioural dimensions referred to as personality traits ... -
Breeding for disease resistance against Edwardsiella ictaluri in Mekong striped catfish (Pangasianodon hypophthalmus)
(PhD Thesis;2020:77, Doctoral thesis, 2020)Bacillary necrosis (BN) is a disease caused by Edwardsiella ictaluri (E. ictaluri) that results in severe economic losses in farming of Mekong striped catfish (Pangasianodon hypophthalmus) in Vietnam. Genetic selection ... -
Breeding for Milk Production in Sheep in Ethiopia
(Phd Thesis;2021:34, Doctoral thesis, 2021)The overall aim of this study was to investigate options to breed sheep for milk production and to find out the optimal proportion of Awassi in Local sheep breeds for milk production through the prevailing Community-Based ... -
Can fish grow on trees? Nutritional and functional properties of yeasts in diets for Atlantic salmon (Salmo salar)
(Phd Thesis;2022:11, Doctoral thesis, 2022)Yeasts are gaining attention as alternative ingredients in fish feeds. The nutritional and health potentials of non-saccharomyces yeasts in fish are scarce in literature. Three non-saccharomyces yeasts; Cyberlindnera jadinii ... -
Carbohydrate digestion in horses : methods, processing, and future perspectives
(PhD Thesis;2022:7, Doctoral thesis, 2022)Understanding the digestion of nutrients in different segments of the gastro-intestinal tract of horses is important for correct feed evaluation. This thesis aimed to examine starch and fibre digestion and fermentation in ... -
Cell fate and blade patterning during the early growth of Saccharina latissima sporophytes
(PhD Thesis;2023:14, Doctoral thesis, 2023)Saccharina latissima is a multicellular parenchymatic photosynthetic organism in the group of brown algae (Phaeophyceae). It belongs specifically to the group of kelps (Laminariales), a group that has recently acquired ... -
Characterization of genes and proteins related to chitin metabolism in Atlantic salmon
(PhD Thesis;2022:46, Doctoral thesis, 2022)Chitin is an insoluble polysaccharide and important component in the extracellular matrix of invertebrates such as arthropods, algae, and fungi. In vertebrates, the role and significance of chitin have not been deeply ... -
Characterization of genes and gene products influencing carotenoid metabolism in Atlantic salmon
(PhD Thesis;2017:36, Doctoral thesis, 2017)Distinct red flesh color is a unique trait of the fish genera Oncorhynchus, Salvelinus, Salmo and Parahucho. In this thesis we have investigated its molecular basis in Atlantic salmon to better understand how and why it ... -
Choosy chicks : chicken life quality is a matter of choices
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The contribution of repetitive elements to salmonid genome evolution
(Phd Thesis;2022:72, Doctoral thesis, 2022)Eukaryotic genomes typically consist of a substantial proportion of repetitive DNA in the form of transposable elements (TEs) and satellite DNA. From studies of mammals, model species, and a few other well studied lineages ... -
Control of rush (Juncus spp.) : an expanding weed in grassland areas in Western Norway
(PhD Thesis;2016:83, Doctoral thesis, 2016)The perennial weeds soft rush (Juncus effusus L.) and compact rush (J. conglomeratus L.) have become an increasing problem in grassland in Western Norway and other European countries with high annual precipitation. Their ... -
Cow-calf contact in dairy farming : Norwegian cowcalf contact (CCC) farmers’ practice and perceptions, and effects of CCC on behavior and performance on pasture
(PhD Thesis;2023:78, Doctoral thesis, 2024)The separation of cow and calf within the first day after calving is common practice in dairy farming, but cow-calf contact (CCC) systems are receiving increased attention from different stakeholders. This interest is ... -
Density dependent foraging ecology and performance of domestic sheep on alpine ranges
(PhD Thesis;2012:2, Doctoral thesis, 2012)Populations of large herbivores are strongly influenced by density dependent and independent processes such as climatic variability, which have common effects on individual performance and demographic rates. However, little ...