Sökning: "eggs"

Visar resultat 21 - 25 av 143 avhandlingar innehållade ordet eggs.

  1. 21. Ecological genetics of inbreeding, outbreeding and immunocompetence in Ranid frogs

    Författare :Jörgen Sagvik; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Using artificial fertilization, I crossed frogs from different populations to evaluate fitness consequences for the offspring from an inbreeding-outbreeding perspective, and to evaluate quantitative genetic effects on immunocompetence against a fungal pathogen (Saprolegnia). Crosses between closely situated populations of different sizes generated contrasting results for the effects of outbreeding on offspring traits between populations and life history stages, emphasizing the importance of epistatic effects and the difficulties of relying on generalizations when making conservation decisions (e. LÄS MER

  3. 22. Behavioural mechanisms behind aggregation in a tritrophic perspective

    Författare :Jörg Stephan; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Gregarious organisms need to handle the trade-off between positive effects of group living and increasing food competition. The gregarious Phratora vulgatissima, a specialist leaf beetle on willow in Europe and Asia, frequently reaches outbreak densities in natural stands and short rotation coppices. LÄS MER

  4. 23. Endocrine markers of ovarian function: Clinical and biological aspects with focus on Anti Müllerian hormone

    Författare :Leif Bungum; Malmö Reproduktionsmedicin; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Anti Müllerian Hormone; ovarian reserve; biomarker; Luteinizing Hormone; fecundity; fertility; Time to Pregnancy;

    Sammanfattning : Declining birthrates and infertility are now a common problem in the Western World. Due to the tendency to postpone childbearing an increasing age of women who consider motherhood is generally seen. LÄS MER

  5. 24. Biochemical studies of thiamine deficiency in Baltic salmon (Salmo salar)

    Författare :Gun Åkerman; Lennart Balk; Björn Brunström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Environmental toxicology; Miljötoxikologi; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : The first part of this thesis is about the development of a method to inject various substances into the yolk of fish eggs. The method was named nanoinjection and enabled the injection of volumes as small as 10-9 L into the yolk of single fish eggs directly after fertilization, with insignificant mortality due to the injection. LÄS MER

  7. 25. Ascaridia galli in laying hens: Adaptation of a targeted treatment strategy with attention to anthelmintic resistance

    Författare :Behdad Tarbiat; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Ascaridia galli is a round-worm of wild and domesticated fowl in the Ascaridiidae family within phylum Nematoda. The direct life cycle includes free-living parasite eggs in the environment and larvae and adults worms in the small intestine of the host. Infection is associated with reduced health and production losses in laying hens. LÄS MER