Sökning: "Chickens"

Visar resultat 1 - 5 av 58 avhandlingar innehållade ordet Chickens.

  1. 1. Stress in chickens : Effects of domestication and early experience on behaviour and welfare

    Författare :Maria Ericsson; Per Jensen; Linda Keeling; Bjarne Braastad; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The domestication is the process where animals have adapted to human conditions. A prerequisite for domestication is tame behaviour towards humans and subsequently, selection for other desirable traits took place which led to changes in several behavioural and physiological parameters. LÄS MER

  3. 2. Intermittent fasting in chickens : Physiological mechanisms and welfare implications for broiler breeders

    Författare :Caroline Lindholm; Jordi Altimiras; Ian Dunn; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Broiler breeder chickens are the parent stock used to produce broiler chickens raised for human consumption and have long been caught in a welfare dilemma. The immensely successful selection of fast-growing meat-type chickens over the last 80 years has created a remarkably efficient meat-producer and given us access to cheap chicken meat but has also created health problems for the animals. LÄS MER

  4. 3. Domestication effects on foraging behaviour : consequences for adaptability in chickens

    Författare :Christina Lindqvist; Per Jensen; Björn Forkman; Linköpings universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Etologi; chicken; domestication effects; behaviour; red jungle fowl RJF ; contrafreeloading CFL ; egg production; Ethnology; Etnologi;

    Sammanfattning : The main aim of this thesis was to study domestication effects on foraging behaviour in chickens and to investigate whether and how domestication and selection for high production have influenced adaptability in chickens. Two domestic strains of chickens (egg layers and meat type chickens) and their wild ancestor, the red jungle fowl (RJF) were compared in different test situations with respect to foraging behaviour and adaptability. LÄS MER

  5. 4. The Physiology of Chicken Domestication : Involvement of the HPA-axis and the Autonomic Nervous System

    Författare :Magnus Elfwing; Jordi Altimiras; Michael Axelsson; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Domestication; chickens; HPA-axis; autonomic nervous system; heart rate; allometry;

    Sammanfattning : Domesticering är en urvalsprocess för önskvärda egenskaper hos djur som över tid förändrar deras utseende, beteende och genetik. Några exempel av djur som genomgått denna riktade avel är vargen, mufflon, uroxen, vildsvinet och den röda djungelhönan som vi idag känner som hunden, fåret, kon, grisen och slaktkycklingen. LÄS MER

  7. 5. Dissertatio botanico-oeconomica de esca avium domesticarum, quam consens. exper. facult. medicæ. in Regia academia Upsaliensi, præside ... D:no Doct. Carolo v Linné ... in audit. Carol maj. d. [26] Nov. 1774 ... defendet auctor et respondens Petrus Holmberger alumnus regius, Ostro-Gothus

    Författare :Carl von Linné; Petrus Holmberger; Carl von Linné; Uppsala universitet; []
    Nyckelord :Ducks; Chickens; Poultry; Poultry; Chickens; Ducks; Fjäderfä; Fodermedel; Ankor; Höns;

    Sammanfattning : .... LÄS MER