Search for dissertations about: "White Leghorn"

Showing result 1 - 5 of 14 swedish dissertations containing the words White Leghorn.

  2. 1. Characterisation of social behaviour in red junglefowl and White leghorn laying hens : phenotypic and genetic studies

    Author : Johanna Väisänen; Harry Blokhuis; Linköpings universitet; []
    Keywords : Red junglefowl; social behaviour; behaviour tests; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : The objective of this thesis was, by using two model strains of chicken, red junglefowl and White Leghorn layer, to study differences in social behaviour of the species that could be derived from domestication and production related selection processes. The social phenotype characterisation was done to be able to further study the association of the social differences to specific production related traits as well as to certain genome areas in intercross and backcross lines generated from these two parental populations. READ MORE

  4. 2. Exploring the Realm of Gene Expression Differences Between White Leghorn and Red Junglefowl Chickens

    Author : Carolyn Fitzsimmons; Leif Andersson; Finn Hallböök; Dave Burt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular genetics; chicken; gene expression; microarray; polymorphism; Genetik; Genetics; Genetik;

    Abstract : In this thesis we attempted to elicit patterns of gene expression that influence phenotype, and that may also have been altered by thousands of years of domestication and selection, between red junglefowl and White Leghorn chickens. Red junglefowl are the wild ancestor to all domesticated chickens, and poultry in general are highly valued as a research animal and food resource. READ MORE

  5. 3. Genomics of heterosis and egg production in White Leghorns

    Author : Esinam Amuzu; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Crossbreeding  is  practiced  extensively  in  commercial  breeding  programs  of many  plant and animal species, in order to exploit heterosis, breed complementarity, and  to  protect  pure  line  genetic  material.  The  success  of  commercial  crossbreeding  schemes depends on identifying and using the right combination of breeds, lines or  varieties  that  produce  the  desired  crossbred  offspring. READ MORE

  6. 4. Mapping Genes Affecting Phenotypic Traits in Chicken

    Author : Susanne Kerje; Leif Andersson; Martien Groenen; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; chicken; Quantitative Trait Loci; growth; egg production; epistasis; plumage colour; Extended black; MC1R; Dominant white; PMEL17; Genetik; Clinical genetics; Klinisk genetik;

    Abstract : The purpose of gene mapping is to understand the underlying genetics of simple and complex traits like plumage colour and growth. This thesis is based on a cross between the wild ancestor of the modern chicken, the red junglefowl, and a White Leghorn line selected for high egg mass. READ MORE

  7. 5. Effects of domestication related genes on behaviour, physiology and gene expression in chickens

    Author : Anna-Carin Karlsson; Per Jensen; Randi Oppermann Moe; Linköpings universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Domestication, the process when animals adapt to captivity, tends to modify a whole array of traits towards what has been termed “the domesticated phenotype”, where the domesticated animal differs from its wild ancestor in morphology, physiology, development and behaviour. Physiological traits and behaviours are controlled by genes. READ MORE