Browsing Doctoral theses (IHA) by Title
Now showing items 1-20 of 39
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A comparison of organic grass-clover silages from primary growth and regrowth in dairy cows
(PhD Thesis;2016:24, Doctoral thesis, 2017-12-06)The annual milk yield of Norwegian organic dairy cows increased by 18% in 2013 compared to 2007 levels. The increased milk yield in this period was achieved by increased levels of concentrate feed in the diet. Given that, ... -
A quantitative genetic study on the proportion of males in tilapia
(PhD Thesis;2011:63, Doctoral thesis, 2011)Early sexual maturation is one the main constraints in Tilapia farming since early breeding causes stunted growth and large size variability. To circumvent this problem all-male populations are used commercially, and ... -
Aerobic exercise training for improving robustness of Atlantic salmon (Salmo salar)
(PhD Thesis;2012:29, Doctoral thesis, 2012)Exercise training produces a wide range of benefits to fish kept in captivity. Research has shown that among several other parameters, growth, feed efficiency, feed intake and cardiac capacity are improved. In higher ... -
Antarctic krill (Euphausia superba) as a feed ingredient for salmonids with focus on the shell fraction and fluoride
(PhD Thesis;2011:21, Doctoral thesis, 2011)Antarctic krill (Euphausia superba) may be the largest biomass of a single species worldwide and is a promising ingredient for use in fish feeds. Krill have a balanced amino acid profile, and krill lipids are rich in ... -
Development and evaluation of 4-way crossbred chicken population in Southern Ethiopia
(PhD Thesis;2010:46, Doctoral thesis, 2010)Village chickens in Ethiopia are predominantly indigenous. They play an important role in the livelihood of farmers mainly by providing animal protein through meat and egg, as a source of income and family saving, and means ... -
Development and functions of adipose tissue in Atlantic salmon
(PhD Thesis;2009:42, Doctoral thesis, 2009)The trend in salmon aquaculture is to use feed with high lipid content. In current feeds, energy from lipids can comprise as much as 50% of the total energy, compared to 10% approximately 20 years ago. This change was ... -
Farm animal-assisted interventions in clinical depression
(PhD Thesis;2011:25, Doctoral thesis, 2011)Depression affects millions of people every year. Depressed individuals suffer from depressed mood, loss of interest and enjoyment, reduced energy, diminished activity, reduced attention and concentration and reduced ... -
Genetic analyses of claw health in Norwegian Red
(PhD Thesis;2015:67, Doctoral thesis, 2015)The main objective of this PhD-study was genetic analyses of claw disorders recorded at claw trimming, to exploit the most efficient way of including claw health in the breeding scheme of Norwegian Red. Claw health data ... -
Genetic analyses of feed efficiency traits in pigs
(PhD Thesis;2016:55, Doctoral thesis, 2017-12-12)The main objective of this thesis was to establish more detailed measurements feed efficiency in Norwegian Landrace and Norwegian Duroc in order to genetically improve this trait without negative consequenses for other ... -
Genetic analyses of meat, fat and carcass quality traits measured by rapid methods
(PhD Thesis;2011:13, Doctoral thesis, 2011)The overall aim of this thesis was to analyse meat and fat quality traits using quantitative genetic methods. This study has demonstrated that it is possible to establish simple laboratory practices and high quality rapid ... -
Genetic studies of Nile tilipia (Oreochromis niloticus) for farming in northern Vietnam : growth, survival and cold tolerance in different farm environments
(PhD Thesis;2010:04, Doctoral thesis, 2010)The present work explores genetic parameters for growth, survival and cold tolerance of tilapia in different farm environments in northern Vietnam. The results are important for further development of selective breeding ... -
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 ...