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.
Recent Submissions
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Sweet potato production in South Sudan : current status, virus infections and whitefly vector diversity
(PhD Thesis;2019:98, Doctoral thesis, 2019)Sweet potato (Ipomoea batatas (L.) Lam.) is an important staple food crop that assures food security in sub-Saharan Africa, especially East Africa. In South Sudan, sweet potato is a main staple food crop for many farming ... -
Interactions between the cereal aphid pests Sitobion avenae and Rhopalosiphum padi and their fungal natural enemies
(PhD Thesis;2019:70, Doctoral thesis, 2019)In agronomy, efficient plant protection strategies are required to reduce pest pressure and increase crop yield. Pesticide application has been the dominant method for plant protection for almost a century. However, the ... -
Multivariate analyses of milk infrared spectra and predictions from it in dairy cattle populations
(PhD Thesis;2017:65, Doctoral thesis, 2017)Fourier-transform mid-infrared (FT-MIR) spectra of milk is one of the multivariate information routinely recorded by many milk-recording organizations in the world. Use of such information is becoming central to research ... -
Sensitivity of plants exposed to gamma radiation : a physiological and molecular study
(PhD Thesis;2019:100, Doctoral thesis, 2019)Sessile organisms such as plants need to cope with a range of changing environmental conditions and stressors, including ionizing radiation like gamma, beta or alpha radiation and non-ionizing radiation (UV-A and UV-B ... -
Sweet potato virus in Ethiopia : detection, characterization, elimination and management
(PhD Thesis;2019:94, Doctoral thesis, 2019)The initiative to improve sweet potato production and productivity in Ethiopia began in the 1980s and so far, there are 26 improved sweet potato varieties made available for farmers. Lack of a rigorous quarantine scheme ... -
The neural basis of threat-sensitive behaviour in fish
(PhD Thesis;2015:6, Doctoral thesis, 2020-11-10)Fear, or threat-sensitive behaviour, is an emotionally guided response allowing animals to minimize exposure to potential danger. Stress is a set of physiological/behavioural responses to such exposure. Among other ... -
Genetic analyses of new milkability, temperament, and udder health traits for Norwegian Red cows based on data from automatic milking systems
(PhD Thesis;2020:24, Doctoral thesis, 2020)The overall aim was to investigate several novel phenotypes recorded routinely for individual cows milked in automatic milking systems (AMS). Data were gathered from 77 Norwegian dairy farms, with additional data from ... -
Establishment of a base population for long-term genetic improvement of Nile tilapia in Ethiopia
(PhD Thesis;2019:8, Doctoral thesis, 2019)The success of genetic improvement obtained in fish breeding programs depends on the genetic diversity of the founder populations and how the base population is constructed, as they influence the genetic variation of the ... -
Integrated weed management in Teff - case of Tigray, Ethiopia
(PhD Thesis;2019:22, Doctoral thesis, 2019)Teff (Eragrostis tef (Zucc.) Trotter) is among the small-grained cereal crops dominantly grown in Ethiopia for its grain and straw. It belongs to the family Poaceae. It is a self-pollinated, annual, warm season C4 grass, ... -
Genomics of bovine milk fat composition
(PhD Thesis;2018:19, Doctoral thesis, 2018)Bovine milk is a highly regarded food source. Still, some milk fatty acids may have unfavourable health effects and can influence manufacturing properties of dairy products. Individual milk fatty acids show moderate ... -
Non-additive genetic effects in Nile tilapia
(PhD Thesis;2018:101, Doctoral thesis, 2018)Nile tilapia (Oreochromis niloticus) is the world’s fastest growing aquaculture species, in terms of annual increase in production (ca 10%) and is today produced world-wide. Most of the commercial and farmed Nile tilapia ... -
Rearing of Norwegian Red replacement heifers : effect of growth rates on lifetime production and profitability
(PhD thesis;2018:62, Doctoral thesis, 2018)This thesis is part of a larger research project aimed at assessing the impact of calf and youngstock development on dairy cow production and profitability. The rearing of Norwegian Red replacement heifers is largely ... -
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 ... -
Sugarcane production in Malawi : pest, pesticides and potential for biological control
(PhD Thesis;2018:65, Doctoral thesis, 2018)Sugarcane is an importance source of energy and livelihoods worldwide. The production of sugarcane is significantly affected by several insects, weeds and pathogens commonly referred to as pests. In addition, climate ... -
Identification of sperm parameters and gene variants influencing boar fertility
(PhD Thesis;2018:37, Doctoral thesis, 2018)Boar fertility has a major impact on overall pig reproductive efficiency, and good semen quality is essential for successful fertilization and proper embryo development. Thus finding semen characteristics that can predict ... -
Rapeseed co-products in pig diets : effects on nutrient and energy digestibility and metabolism
(PhD Thesis;2017:90, Doctoral thesis, 2017)The European pig industry is heavily dependent on imported protein feedstuffs, particularly soybean meal (SBM). Increased and more efficient use of locally produced protein sources, such as rapeseed (RS), could alleviate ... -
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 ... -
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 ...
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