Browsing Doctoral theses (IHA) by Title
Now showing items 16-35 of 44
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Genetic studies on improvement of striped catfish (Pangasianodon hypophthalmus) for economically important traits
(PhD Thesis;2010:43, Doctoral thesis, 2010)The aim of this study was to find non-invasive methods for measuring fillet weight, fillet yield and fillet fat on striped catfish (Pangasianodon hypophthalmus), to examine the magnitudes of genetic variance and covariance ... -
Genetic variation and management of the Norwegian horse breeds
(PhD Thesis;2011:05, Doctoral thesis, 2011)The Norwegian horse breeds suffer from strong competition in the market from imported, specialized breeds. Decreasing population sizes, especially for the Fjord, the Døle and the Nordland/Lyngen, and risk of rapid accumulation ... -
Genomic architecture and complex traits in norwegian red cattle
(PhD Thesis;2010:50, Doctoral thesis, 2010)The predominant cattle breed in Norway, Norwegian Red cattle (NRF), is an admixed breed formed from local Norwegian breeds and imported animals from other Nordic breeds. The extensive phenotypic records for NRF represent ... -
Genomic responses of salmonids to pathogenic agents and nutritional interventions
(PhD Thesis;2009:43, Doctoral thesis, 2009)Aquaculture exposes salmonid fish to diverse stressors, including pathogens and inadequate nutrition. The identification of molecular basis underlying compromised health and growth caused by these factors is confounded by ... -
High quality grass silage to dairy goats : effect on energy balance, milk yield and quality
(PhD Thesis;2010:48, Doctoral thesis, 2010)The general aim of this thesis has been to investigate the effect of high quality silage, harvested at an early stage of maturity, on energy intake, energy balance, milk production and milk quality of goats. It was also ... -
Hydrolysis of Atlantic salmon (Salmo salar) rest raw materials : influence of process conditions and evaluation of hydrolysate in diets for broiler chickens and piglets
(PhD Thesis;2015:85, Doctoral thesis, 2018-04-25)Annually Norway produces 1.3 million tons of Atlantic salmon and the levels of production are still rising. After withdrawal of eviscerated fish and filet, 336 000 tons of rest raw material are available for further ... -
Improved nutritional value of fish feed with plant protein ingredients by means of organic acid salts and solid state fermentation
(PhD Thesis;2011:23, Doctoral thesis, 2011)The objective of this work was to improve the nutritional value of plant protein sources to be used in fish feed by means of organic acid salts and solid state fermentation (SSF). Four studies were conducted to determine ... -
Improving the accuracy of genomic predictions in numerically small populations
(PhD Thesis;2016:20, Doctoral thesis, 2017-12-06)Genomic selection (GS) is increasingly being implemented in livestock, especially in the dairy cattle sector. While dairy cattle populations such as Holsteins have benefitted greatly from GS in the accuracy of evaluation ... -
Inbreeding determined by the amount of homozygous regions in the genome
(PhD Thesis;2015:41, Doctoral thesis, 2017-11-30)The main aim of this PhD was to study long homozygote segments present in the genome in Norwegian Red, and find genomic options to measure inbreeding more accurately than from a pedigree database. Prior to the study, runs ... -
Interactive effects of dietary and environmental challenges on digestive function and intestinal homeostasis in rainbow trout (Oncorhynchus mykiss)
(PhD Thesis;2016:82, Doctoral thesis, 2016)Aquaculture is challenged by various dietary and environmental factors. A widely debated and studied dietary challenge is the inclusion of plant ingredients containing anti-nutritional factors (ANFs) in salmonids diet. ... -
Linking the heritability concept to systems dynamics
(PhD Thesis;2013:18, Doctoral thesis, 2013)The concept of heritability is rooted in the observation that relatives resemble one another more than expected by chance. Narrow-sense heritability is defined as the proportion of phenotypic variance that is attributable ... -
Molecular studies of Atlantic cod (Gadus morhua) globin genes – functional effects of hemoglobin polymorphisms and their geographical distribution
(PhD Thesis;2011:56, Doctoral thesis, 2011)The phenotypic variation among Atlantic cod hemoglobins and their physiological properties has been of great interest to researchers for several decades, and many cod stocks have been “genotyped” according to the HbI ... -
Morphological and molecular characterization of developing vertebral fusion in altantic salmon (Salmo salar)
(PhD Thesis;2010:26, Doctoral thesis, 2010)Problems with spinal disorders in Atlantic salmon (Salmo salar) have been increasingly in focus due to the importance of this species in the aquaculture industry. Until recently, the molecular development of spinal deformities ... -
Nutritional and anti-nutritional quality of range vegetation in southern Ethiopia and supplementary values of selected browse leaves to goats
(PhD Thesis;2010:51, Doctoral thesis, 2010)Livestock are reared in all agroecological zones of Ethiopia under various production systems. Goats, although found in all agroecological zones, are popular in the drier environments since they adapt well in harsh condition ... -
Nutritive values of selected forages for ruminants in Vietnam. Supplementation of varying level of cassava root meal and groundnut cake during growing phase, and its effect on performance of Laisind cattle in the finishing phase
(PhD Thesis;2014:82, Doctoral thesis, 2014)In Vietnam, the demand on quantity and quality of beef has been increasing rapidly but the domestic production does not meet these demands. Vietnam had a production of 293 969 tons of beef cattle in 2012, and had imported ... -
Optimal use of plant protein concentrates in extruded feeds for carnivorous fish
(PhD Thesis;2011:53, Doctoral thesis, 2011)The main objective of the research presented in this thesis was to evaluate multiple amino acidsupplemented plant protein concentrates as the main protein source in diets for carnivorous fish. This objective was approached ... -
Physical and social environment for sheep : effects on spacing behaviour, social interactions and activity budgets in housed ewes
(PhD Thesis;2010:49, Doctoral thesis, 2010)I innefôringsperioden blir sauen ofte holdt i et stimulusfattig miljø med høy dyretetthet og fullspaltegulv, noe som medfører begrenset tilgang til ressurser, hyppig håndtering og lite plass til å trekke seg unna eller ... -
Protein quality evaluation of animal protein ingredients applied in extruded dry dog food using mink (Neovison vison) as a model species
(PhD Thesis;2016:78, Doctoral thesis, 2020-11-24)Determination of protein and amino acid (AA) digestibility is essential for protein quality evaluation of dog foods, and should preferably be measured as standardized ileal digestibility (SID). Assessment of protein ... -
Quantitative genetics of traits related to disease resistance and effects of vaccination in Atlantic salmon (Salmo salar)
(PhD Thesis;2011:39, Doctoral thesis, 2011)Disease resistance is of major importance to the fish farming industry as disease outbreaks have negative effects on the industry’s economy, its reputation and on fish welfare. Today, almost all fish in the Norwegian salmon ... -
Rearing Norwegian Red heifers : growth and effects on subsequent milk production of primiparous cows
(PhD Thesis;2015:48, Doctoral thesis, 2019-01-07)The thesis is part of a larger research project aiming to determine the impact of calf and youngstock development on dairy cow production and profitability. Paper I utilized field data to find a more marginal effect of ...