Doctoral theses (BioVit)
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.
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Plant-parasitic nematodes of the Ethiopian food security crop enset (Ensete ventricosum) : occurrence, distribution, characterisation and management
(PhD Thesis;2021:32, Doctoral thesis, 2021)To confront the challenges of eradicating hunger and improve food security, agricultural growth needs to be driven by intensification. This in turn increases the threat of pests and diseases, including plant-parasitic ... -
Genomics exploring population structure and sex determination in Atlantic cod (Gadus morhua)
(PhD Thesis;2019:102, Doctoral thesis, 2019)Atlantic cod (Gadus morhua) is a benthopelagic cold-water marine species found across the North Atlantic Ocean. Thanks to its historical and current significance as an important food resource it is one of the most well-known ... -
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 ... -
Genetic studies of the wheat-Parastagonospora nodorum pathosystem
(PhD Thesis;2020:21, Doctoral thesis, 2020)Septoria nodorum blotch (SNB) caused by the necrotrophic fungus Parastagonospora nodorum is the major wheat leaf blotch disease in Norway. It reduces both yield and grain quality by causing symptoms on wheat leaves and ... -
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 ... -
Genetic analyses of semen characteristics in Norwegian Red
(PhD Thesis;2021:62, Doctoral thesis, 2021)The research on the genetics of bull fertility is limited, many studies are old, estimates are often based on few observations or few bulls, and with large or lacking standard errors. With more than 20 years of data on ... -
Supplying dairy cows with Propionibacterium to reduce enteric methane emission
(PhD Thesis;2021:16, Doctoral thesis, 2021)The primary target of this research was to explore the ability of promising propionibacteria strains to reduce the enteric methane emission from dairy cows. The second objective was to study the effect of propionibacteria ... -
Quantitative genetics of growth rate and carcass quality traits in Atlantic salmon
(Phd Thesis;2021:39, Doctoral thesis, 2021-05-06)Quantitative genetic parameters of quality traits and growth rate in Atlantic salmon are commonly recorded at a target average market body weight (4-5 kg) at which the individuals are at the same age, which is less labour ... -
Genomic methods in breeding programs: Parental assignment, triploid genomics and case-parental control modelling
(Phd Thesis;2021:7, Doctoral thesis, 2021)The use of high-density single nucleotide polymorphism (SNP) genotypes enables us to perform highly accurate parentage assignment. However, dependence between loci often results in using a subset of the data to obtain ... -
A new approach for predicting milk production responses and feed utilization in dairy cows
(Doctoral thesis, 2021)Feed evaluation systems (FESs), such as the Nordic Feed Evaluation System (NorFor), aim to help dairy producers compare the nutritive value of various types of feed, formulate of balanced diets, and predict animal performance ... -
Identification of photoreceptors with functional characterization of photolyase in Pseudoidium neolycopersici
(PhD Thesis;2021:72, Doctoral thesis, 2021)Powdery mildew caused by Pseudoidium neolycopersici is one of the most destructive diseases, occurring predominantly on greenhouse grown tomatoes, and has gained importance worldwide due to severe economic losses in terms ... -
Reproductive and Genetic Studies in Large Yellow Croaker
(Doctoral thesis, 2021-12-15)Large yellow croaker (Larimichthys crocea) is distributed in the coastal regions of East Asia and is one of the most important marine aquaculture species in China. However, due to overfishing, it has been difficult to ... -
Nutritional, health, and technical properties of black soldier fly (Hermetia illucens) in Atlantic salmon (Salmo salar) feeds
(PhD Thesis;2021:79, Doctoral thesis, 2021)Black soldier fly (BSF) (Hermetia illucens) has been identified as a promising novel ingredient in fish feeds. The knowledge on optimal downstream processing of BSF is, however, lacking in the literature. The main objective ... -
Sheep breeds in contrasting environments - pasture utilization at different spatiotemporal scales
(PhD Thesis;2018:24, Doctoral thesis, 2018)In Norway, approximately 2 million sheep are released onto outer fields for summer grazing. Indeed, during the summer months sheep are the most common large herbivores in most Norwegian mountain areas. The sheep, of which ... -
Growth, stomatal responses and postharvest characteristics of Rosa x hybrida : the influence of air humidity and light quality
(PhD Thesis;2013:77, Doctoral thesis, 2013)Greenhouse production systems are important in the production of vegetables, herbs and ornamentals. Roses are among the most valuable crops in the greenhouse floriculture industry and are produced as pot plants or as a cut ... -
Tetradecylthioacetic acid (TTA) : a functional feed ingredient for Atlantic salmon affecting early sexual maturation, cardiac robustness and β-oxidative capacity
(PhD Thesis;2018:36, Doctoral thesis, 2018)Utilisation of fatty acids highly dominates energy metabolism in high performance fish as the Atlantic salmon. It is well established knowledge that feed intake and growth of salmon is highly influenced by water temperature ... -
Growth, feed utilization, health and biometric parameters in Atlantic salmon (Salmo salar L.) - Influence of dietary protein-to-lipid ratio and body fat status
(PhD Thesis;2018:103, Doctoral thesis, 2018)Today, commercial diets for large farmed Atlantic salmon (Salmo salar L.) commonly contain 30-35 % protein and 35-39 % lipids, i.e. a ratio of protein-to-lipids below 1. Such energy dense diets have generally been shown ... -
Dynamic dietary salmon farming in the Faroe Islands with regards to production, quality and economic improvements
(PhD Thesis;2018:104, Doctoral thesis, 2018)The development of feeds for Atlantic salmon has been an ongoing process since the industry started in the 1970s. In the early years, salmon feeds had higher share of proteins than lipids, but after the introduction of ... -
Genetic improvement of feed efficiency in dairy cattle
(PhD Thesis;2017:106, Doctoral thesis, 2017)The main objective of the thesis was to investigate the requirements and possibilities for including feed efficiency (FE) in the breeding goal in dairy cattle and hence enable the genetic improvement of feed efficiency. ...
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