Browsing Doctoral theses (BioVit) by Title
Now showing items 40-59 of 74
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Improving the utilisation of phytate-bound phosphorus in feed for poultry and pigs through increased efficacy of exogenous phytase in the anterior digestive tract
(PhD Thesis;2020:76, Doctoral thesis, 2020)The majority of phosphorus (P) in feedstuffs is present as phytate-P. Phytate is the storage form of P in seeds and grains and consists of an inositol ring with six phosphate groups bound to it. The phytate-P is only ... -
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, ... -
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 ... -
Management of genomic inbreeding in breeding schemes
(PhD Thesis;2019:25, Doctoral thesis, 2019)The overall aim of this research work was to explore strategies that manage genetic variation at the genomic level in the era of powerful genomic selection methods. In paper 1, the role of alternative genomic relationship ... -
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 ... -
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 ... -
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 ... -
Novel indicator traits for individual feed efficiency in Atlantic salmon (Salmo salar)
(PhD Thesis;2019:02, Doctoral thesis, 2019)Selective breeding for enhanced feed efficiency in aquaculture production has so far been performed indirectly, largely through selection for an improved growth rate. However, a substantial fraction of the genetic variation ... -
Novel protein sources in diets for weaned piglets – effect on growth performance, gut function, and health
(PhD Thesis;2022:50, Doctoral thesis, 2022)The world is facing a growing food demand from an ever-increasing population. To meet this challenge, new resources must be utilized through innovative solutions. Meat is a valuable protein source in the human diet. However, ... -
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 ... -
Participatory and collaborative approaches in sustainability transitions : niche innovations in agri-food systems
(PhD thesis;2023:60, Doctoral thesis, 2023)Agri-food systems contribute to and face sustainability challenges across the entire value chain, from production, distribution, processing to retailing, consumption, and wastage. Organic farming, localized food systems, ... -
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 ... -
Potato soft rot Pectobacteriaceae in Norway – seed potato health, association with insects and molecular mechanisms of disease development
(PhD Thesis;2018:92, Doctoral thesis, 2018)Soft rot Pectobacteriaceae are among the most problematic pathogens of a wide variety of crop plants and ornamentals. Among their hosts is potato, the most important food crop in Norway, where the bacteria cause soft rot ... -
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 ... -
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 ... -
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 ... -
Rearing of Norwegian Red replacement heifers; Short- and long-term effects of dietary energy and protein levels on growth characteristics and adipose tissue gene expression
(PhD thesis;Thesis number 2019:12, Doctoral thesis, 2019)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 potential impact of heifer growth on future milk yield has ... -
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 ... -
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 ...