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Prenatal stress in birds: Pathways, effects, function and perspectives
TLDR
The results suggest that besides prenatal exposure to cortic testosterone itself, maternal corticosterone affects offspring's behaviour and physiology via alteration of other egg components, however, results are inconsistent.
Steroids in chicken egg yolk: metabolism and uptake during early embryonic development.
TLDR
Analysis of the changes in distribution and metabolism of steroid hormones in the egg during the first 6 days of incubation using injections of radiolabelled testosterone and corticosterone shows that the injected radiolabel is metabolised in the Egg and taken up by the embryo, giving the embryo potential control over the effects of maternal hormones and thereby limiting maternal control over of hormone-mediated maternal effects.
Elevated Plasma Corticosterone Decreases Yolk Testosterone and Progesterone in Chickens: Linking Maternal Stress and Hormone-Mediated Maternal Effects
TLDR
It is demonstrated for the first time that maternal plasma corticosterone levels influence reproductive hormone concentrations in the yolk and could mediate environmentally induced changes in yolk gonadal hormone concentrations.
Getting Back to Nature: Feralization in Animals and Plants
TLDR
This review examines plant and animal feralization through an evolutionary lens, including how natural selection, artificial selection, and gene flow shape feral genomes, traits, and fitness.
Maternal corticosterone elevation during egg formation in chickens (Gallus gallus domesticus) influences offspring traits, partly via prenatal undernutrition.
TLDR
It is found that mothers with experimentally elevated plasma corticosterone levels produced offspring that are smaller at hatching, less competitive, less fearful, have lower immunocompetence and higher plasma testosterone levels, as well as an alteration of visually guided behavioural lateralization.
Corticosterone in bird eggs : The importance of analytical validation
TLDR
The analytical validations of chicken albumen, bankiva yolk and yolks from hens with or without artificially elevated plasma corticosterone levels indicated that the main share of the immunoreactivity measured via cortiosterone immunoassays was caused by substances other than authentic cortic testosterone.
Long-Term and Transgenerational Effects of Stress Experienced during Different Life Phases in Chickens (Gallus gallus)
TLDR
The results show that stress during puberty appears to be at least equally critical as the previously studied early life phase, which may have important implications for animal welfare in egg production, since laying hens are often exposed to stress during the three periods pinpointed here.
Corticosterone metabolism by chicken follicle cells does not affect ovarian reproductive hormone synthesis in vitro
TLDR
Chicken follicle cells degrade corticosterone to mostly 20β-dihydrocorticosterone in vitro andabolites such as 17α-hydroxyprogesterone, androstenedione and testosterone were formed.
The domesticated brain: genetics of brain mass and brain structure in an avian species
TLDR
Genetic mapping of brain regions indicates that domestication has led to a larger body mass and to a lesser extent a larger absolute brain mass in chickens, mainly due to enlargement of the cerebellum.
Feralisation targets different genomic loci to domestication in the chicken
TLDR
It is indicated that adaptations to feral and domestic environments involve different genomic regions and feral chickens show some evidence of adaptation at genes associated with sexual selection and reproduction.
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