Browsing Doctoral theses (BioVit) by Title
Now showing items 23-42 of 75
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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 ... -
Genetic diversity, selection signatures and nutritional composition of enset (Ensete ventricosum) from Ethiopia
(PhD thesis;2023:50, Doctoral thesis, 2023)Most of the agrobiodiversity exists in the form of landraces and wild relatives in traditional smallholderbased farming systems. This diversity mainly exists among neglected and underutilized species, so called orphan ... -
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. ... -
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 ... -
Genetic variation in recombination rates and genetic shuffling in pigs, cattle and Atlantic salmon
(PhD Thesis;2022:17, Doctoral thesis, 2022)Meiotic recombination ensures proper segregation of homologues chromosomes in meiosis while also breaking down linkage disequilibrium and creating novel haplotypes by shuffling alleles of genes located on the same chromosome. ... -
The genetics of omega-3 fatty acids in fillets of Atlantic salmon (Salmo salar L.)
(Doctoral thesis, 2019)Decreasing contents of the omega-3 fatty acids EPA and DHA in farmed Atlantic salmon reduces the nutritional value for consumers and influences physiological processes in the fish. Most studies of physiological omega-3 ... -
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 ... -
Genomic prediction using high-density and whole-genome sequence genotypes
(Phd Thesis;2022:33, Doctoral thesis, 2022)The main objective of this thesis was to investigate genomic prediction methods for high-density and whole-genome sequence genotypes, with emphasis on traits that may have difficulties achieving a high prediction accuracy ... -
Genomic structural variations as drivers of adaptation in salmonid fishes
(PhD Thesis;2023:26, Doctoral thesis, 2023)Structural variations (SVs), e.g. deletions, insertions, inversions and duplications of sequences, are a major source of genomic variation affecting more base pairs in the genome than single nucleotide polymorphisms (SNPs). ... -
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 ... -
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 ... -
Grain yield in Norwegian spring wheat : past, present, and future : historical genetic gains, their genetic basis, and prospects of future improvement using phenomics
(PhD thesis;2023:52, Doctoral thesis, 2023)Bread wheat is among the most critical staples worldwide and is essential to Norway’s food production. The aftermath of the green revolution nearly eradicated Norwegian wheat production in the 1950s and 1960s. The lack of ... -
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 ... -
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 ... -
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 ... -
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 ... -
Improved starch and protein utilization by extruded feed pellets targeted to benefit dynamics of rumen digestion in dairy cows
(PhD Thesis;2021:15, Doctoral thesis, 2021)To meet their requirements for energy and amino acids, high-producing dairy cows are fed compound feeds containing high amounts of starch and protein. Optimal utilization of these high-quality feeds is critical, where the ... -
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 ...